Handling and Maintenance
Handling and Maintenance
Handling and Maintenance
01A
CONTENTS
1. Items to be practiced without fail for safety
1.1 Cautionary instructions for operation ................................................................................................................................................................ 1
1.2 Cautionary instructions for maintenance & inspection .................................................................................................................................... 2
1.3 Cautionary instructions for work ........................................................................................................................................................................ 3
2. Before using
2.1 Cautionary instructions in general ..................................................................................................................................................................... 5
2.2 Operation ............................................................................................................................................................................................................... 6
2.2.1 Switching operation ......................................................................................................................................................................................... 6
2.2.2 Trip and reset operation .................................................................................................................................................................................. 7
2.3 How to set current rating, trip characteristic, sensitive current and operating time .................................................................................. 10
2.3.1 Cautionary instructions for setting .............................................................................................................................................................. 10
2.3.2 How to set characteristics of molded-case circuit breakers [800A frame and below electronic overcurrent tripping type] ............... 10
2.3.3 How to set characteristics of molded-case circuit breakers [1000~1600A frame electronic overcurrent tripping type] ..................... 12
2.3.4 How to set characteristics of molded-case circuit breakers [Applicable models: NFE2000-S, NFE3000-S, NFE4000-S] .................... 12
2.3.5 How to set inverse time-delay or instantaneous tripping characteristics of circuit breakers
[Adjustable thermal or magnetic type] ........................................................................................................................................................ 13
2.3.6 How to switch voltage, sensitivity current and operating time (time delay type) of earth leakage circuit breakers ........................... 13
2.3.7 How to change rated current, tripping characteristic and leak tripping characteristic series earth leakage
circuit breakers (electronic overcurrent tripping type) .............................................................................................................................. 14
2.3.8 How to switch voltage, sensitivity current and operating time of earth-leakage relay .......................................................................... 16
3. Installation
3.1 Notice for selection ............................................................................................................................................................................................ 17
3.2 Normal service conditions ................................................................................................................................................................................. 17
3.3 Non-standard conditions ................................................................................................................................................................................... 18
3.4 Inspection at arrival ............................................................................................................................................................................................ 19
3.5 Conditions during transport and storage ........................................................................................................................................................ 19
3.5.1 Transport ........................................................................................................................................................................................................ 19
3.5.2 Storage ............................................................................................................................................................................................................19
3.6 Installation and connection ............................................................................................................................................................................... 20
3.6.1 General ............................................................................................................................................................................................................20
3.6.2 Installation ...................................................................................................................................................................................................... 20
3.6.3 Connection ...................................................................................................................................................................................................... 21
3.6.4 Mounting direction ......................................................................................................................................................................................... 22
3.6.5 Distances between circuit breaker and earthed metal parts ...................................................................................................................... 23
3.6.6 Current-carrying capacity and operating temperature ............................................................................................................................... 24
3.6.7 Breaker arrangements ................................................................................................................................................................................... 26
3.6.8 Instruction for connections .......................................................................................................................................................................... 28
3.6.9 Instruction for accessories .......................................................................................................................................................................... 37
3.6.10 External accessories ..................................................................................................................................................................................... 49
4. MDU breaker
4.1 Measuring Display Unit (MDU) ......................................................................................................................................................................... 74
4.2 Functions and names of each component ...................................................................................................................................................... 75
4.3 Display and operation panel .............................................................................................................................................................................. 75
4.4 MDU terminal ...................................................................................................................................................................................................... 76
4.5 CC-Link transmission ......................................................................................................................................................................................... 78
4.6 Configuration conditions of CC-Link system .................................................................................................................................................. 79
4.7 Connection of terminal resistor (With CC-Link option) .................................................................................................................................. 80
4.8 External connection diagram ........................................................................................................................................................................... 81
4.9 Detailed specifications of MDU ......................................................................................................................................................................... 82
4.10 Operation of MDU .............................................................................................................................................................................................. 85
4.11 Operation of measurement and display mode selection ................................................................................................................................ 85
4.12 Operation of alarm reset ................................................................................................................................................................................... 86
4.13 Operation of function mode selection .............................................................................................................................................................. 87
4.14 Operation of the other setups .......................................................................................................................................................................... 88
4.15 MDU operation modes and displays ................................................................................................................................................................ 90
4.16 Normal service condition ................................................................................................................................................................................... 91
4.17 Measurement of insulation resistance and withstand voltage test ............................................................................................................... 91
4.18 Connections and installation ............................................................................................................................................................................ 92
4.19 Installation in the panel board (EMC directive) ............................................................................................................................................... 93
4.20 Installation of the circuit breaker ...................................................................................................................................................................... 94
4.21 Testing of over current relay method ............................................................................................................................................................... 95
4.22 Installation of alarm contact output module (option) ..................................................................................................................................... 96
4.23 Installation of MDU ............................................................................................................................................................................................. 97
4.24 MDU panel mounting type ................................................................................................................................................................................. 98
4.25 Note of MDU with CC-Link option ..................................................................................................................................................................... 99
4.26 Remote I/O (with CC-Link option) ..................................................................................................................................................................... 99
4.27 Remote register (with CC-Link option) ............................................................................................................................................................. 99
4.28 Error codes ....................................................................................................................................................................................................... 100
4.29 Troubleshooting ............................................................................................................................................................................................... 100
5. Maintenance and inspection
5.1 Initial inspection .............................................................................................................................................................................................. 101
5.2 Periodical inspection ........................................................................................................................................................................................ 105
5.3 Inspection after tripping .................................................................................................................................................................................. 105
5.4 Yardstick service life ........................................................................................................................................................................................ 106
5.5 Standard tools and measuring instruments .................................................................................................................................................. 106
6. Troubleshooting
6.1 Troubleshooting for circuit-breaker proper (MCCB/ELCB) ......................................................................................................................... 107
6.2 Troubleshooting for leakage operation portion ............................................................................................................................................ 108
6.3 Troubleshooting of accessories ...................................................................................................................................................................... 108
6.4 Analysis of unnecessary operation ............................................................................................................................................................... 109
6.4.1 Classification of ELCB operation .............................................................................................................................................................. 109
6.4.2 Detail of operation ........................................................................................................................................................................................ 109
7. After-sales service
7.1 Countermeasures to be taken in case of anomaly ........................................................................................................................................ 113
7.2 After-sales service system .............................................................................................................................................................................. 113
APPENDIX 1 Breaker mounting screws ......................................................................................................................................................................... 114
APPENDIX 2 Standard tightening torque for connections .......................................................................................................................................... 115
APPENDIX 3 Operating force of handle ......................................................................................................................................................................... 116
APPENDIX 4 Service network ......................................................................................................................................................................................... 117
1. Items to be practiced without fail for safety
For correct operation, please go over this paper “Items to be practiced without fail for safety” beforehand.
● Essential items to ensure safety are stated here. Be sure to follow the cautionary instructions given
below.
● The manufacturers assembling their products using this breaker are requested to convey the require-
ments stated in this section “Items to be practiced without fail for safety” to the end users.
● The marks used respectively mean the following.
DANGER
● Don’t touch the terminal. Electrification can result.
● The earth leakage circuit breaker is so composed to operate when differential current be-
tween going and returning reaches certain level, and no leakage is detected in the case as
illustrated below. Never touch, therefore, the uncovered charged parts, two places at a time,
and the power source side of the earth leakage circuit breaker.
The circuit breaker doesn’t operate at the electrification.
Going current
ON
Line side
ON
Load side
[When the power source side of the breaker is touched]
1
CAUTION
● Layman’s work is dangerous. Any electric work must be carried out by a qualified person
(electrician).
● When the breaker cuts off automatically, turn it on after eliminating the cause. Otherwise,
breaker is used.
Grounding work
CAUTION
● Maintenance and inspection must be practiced by a specialist having electrical knowledge.
● Before maintenance & inspection, turn off the upper circuit breaker and make sure of no
current conducting to avoid possible electrification.
Appendix 2.
)
As for fastening torque, refer to
2
1.3 Cautionary instructions for work
CAUTION
● Any electric work must be carried out by a qualified person (electrician).
● Before wiring, turn off the upper circuit breaker and make sure of no current conducting.
Electrification can result.
● Earth leakage circuit breaker dedicated to single phase 3-wire and three phase 4-wire types,
be sure to connect the neutral wire to the neutral phase. Open phase or overcurrent fails
operation and causes fire.
For 1φ, 3-W, connect the neutral wire to neutral 120V
240V
pole 120V
OFF
● Connect the earth leakage circuit breaker to the power source suitable for the ratings of the
breakers. Connecting to a wrong power can cause malfunction and failure.
3
CAUTION
● At wire connection, fasten the terminal screws with the torque stated in the instruction manual.
Fastening with incorrect torque can cause fire.
Example of front connection type fastening torque (Others are in Appendix 2.)
Screw M5 M6 M8 M12
diameter
Terminal Shape
screw
Fastening
torque 2~3 2.5~4.0 5.0~7.0 8.0~13.0 8.0~13.0 40.0~50.0
N·m
Solderless Shape
terminal
screw
Fastening
torque 4.0~6.0 3.5~4.5 20.0~30.0 30.0~40.0 30.0~40.0 50.0~60.0
N·m
2.5 14(2.1) 4 5
4.0 12(3.3) 4 5
6.0 10(5.3) 4 5
10 8(8.4) 4.5 13
16 6(13.3) 5.1 13
25 4(21.2) 5.1 13
35 3(26.7) 6.5 13
– 2(33.6) 6.5 13
50 1(42.4) 6.5 13
– 1/0(53.5) 6.5 13
70 2/0(67.4) 6.5 13
95 3/0(85.0) – 25.5
– 4/0(107) – 25.5
120 250(127) – 25.5
150 300(152) – 25.5
185 350(177) – 25.5
● Refrain from installing in abnormal environment such as high temperature, high humidity,
high dust content, corrosive gas ambient, or of excessive vibration or impact. Electrification,
fire, or operation failure can result.
● Carry out the work avoiding foreign matters such as dust, concrete powder, steel chips, and
rain water to enter into the equipment. Otherwise, operation failure can result.
4
2. Before using
Besides operation, the items in this section are also applicable to work, maintenance and inspection.
DANGER
(1) Refrain from touching the terminal unit as electrification can result.
Note: Besides the terminal of the circuit breaker, the terminal unit includes the wires, bus
bars, ring-type terminals, and other wiring materials.
CAUTION
(1) Layman’s work is dangerous. Any electrical work must be carried out by a qualified person
(electrician).
(2) Be sure to earth all the electrical devices of the circuits in which the earth leakage circuit
breaker is used.
Grounding work
5
2.2 Operation
2.2.1 Switching operation
Electric power can be turned ON/OFF by moving the handle up/down.
Note 1. Never apply any excessive impact to the handle.
Note 2. When the extension handle is used, fix it firmly with screws. After use, remove the extension
handle quickly.
Note 3. ON, OFF operation must operate quickly and correctly. Otherwise it may cause open phase
with a few time when operated slowly in case of some types of breakers.
Operating method and condition of the circuit breaker are illustrated below.
1 Closing (ON)
ON operation ON state indication
ON
mark appears
Switch on the on red back-
power (closing) ground.
ON
ON
A white
line
appears.
2 Opening (OFF)
OFF operation OFF state indication
OFF mark
Switch off the appears on
OFF
power (opening) green
background. OFF
6
2.2.2 Trip and reset operation
(1) For moulded-case circuit breaker
1 Tripping
The moulded-case circuit breaker has an overcurrent tripping device which opens the circuit on
detecting magnitude of overload current or short-circuit current, and is used for protecting electric
wires and other power circuit.
Automatic opening (breaking) of circuits in this way is called “tripping.”
For some products, the circuit breakers can be tripped mechanically from the outside by pressing
the trip button provided on the cover.
Press the trip button while the circuit breakers is kept “ON.” When in “OFF” state, tripping is not
made in some cases.
There are two kinds of trip indications as shown below.
Type Trip indication Re-closing method
Moulded-case circuit breaker in general NF, The handle Eliminate the cause of tripping
NFE, MB, BH. shows the
mid-position OFF
between ON
and OFF.
Reset operation
ON
No white
line is seen.
Trip Re-closing
CAUTION
At an automatic breaking, eliminate the cause then switch on the breaker. Otherwise fire can
be resulted.
If the cause isn’t known, contact us at our service stations, branch offices, local offices, or ask
an electrician in your country.
2 Reset operation
In the case of (1)-(b) of above (1), re-closing is possible by resetting.
Resetting Reset check
Pull down the handle forcefully in OFF direc- When hands are released after reset, the
tion. handle turns to either mode shown below.
Turns OFF.
OFF mark
(reset completion) appears on
green
background. OFF
OFF
OFF
ON
Returns to trip
The handle
(not completion) shows the
mid-position OFF
between ON
and OFF.
ON
7
(2) For earth leakage circuit breaker
1 Trip
Tripping of earth leakage circuit breaker includes two kinds; leak trip in which magnitude of leakage
is detected for automatic tripping (open circuit), and overcurrent trip in which magnitude of overload
current or short-circuit current is detected for automatic tripping.
For distinction of two kinds of tripping, the leak indication button comes out at leak trip only. The
indication button also comes out when the leak test button is pushed for checking leak current
operation.
The handle
indicates
middle position OFF
of ON and
OFF.
ON
No white OFF
Leakage indication OFF
Leakage indication
line is seen. ON
button (white) ON
button (white)
Trip
CAUTION
When the breaker cuts off automatically, turn ON the handle after eliminating the cause.
Otherwise, electrification and fire can take place.
If the cause isn’t known, contact us at our service stations, branch offices, local offices, or ask
an electrician in your country.
2 Reset operation
When the leakage indication button comes out, remove the cause of failure, reset in the following
procedure, then close the circuit again.
NV32-SW~1200-SB
8
(3) For earth leakage relay
1 Operation
When leakage is detected by the earth leakage relay, contact point output is given, the leakage
indicator button comes out, or the leakage indication lamp glows.
2 Reset operation
CAUTION
When the leakage indication button comes out or the leakage indication lamp glows, remove
the cause then reset before starting operation again. Otherwise, electrification can result.
If the cause isn’t known, contact us at our service stations, branch offices, local offices, or ask
an electrician in your country.
9
2.3 How to set current rating, trip characteristic, sensitive current and oper-
ating time
2.3.1 Cautionary instructions for setting
CAUTION
● Let a person having technical knowledge of electricity set the breaker.
● Before setting, turn off the upper circuit breaker, or turn off the circuit breaker to be set or trip
the breaker, then make sure of no current conducting.
Otherwise, electrification can result.
2.3.2 How to set characteristics of molded-case circuit breakers [800A frame and below
electronic overcurrent tripping type]
Group A Group B
70%LED (green)
D
S E A LE
S E A LE
D
D
S E A LE
SEALED
10
[for Group A]
T Ir
(1) Open the button cover using a
MODEL
Ip screwdriver as illustrated at left.
RE250 In 250 A
TL Is
50/60Hz(AC only)
Ts
Ii 70% PAL OVER (2) Set operating characteristics by
Ir(A) TEST TL(s) Is(×Ir) Ts(s) I
Ip(×Ir) turning the dials.
175 200 4 5 6 .2 Ii(×250A) 8 .85 .9
150 225
60 80
3
3.5
7
.1
6
10 .8
.95 For turning the dials for chracteristic
125 250 12
2.5
100 2
8
10 .06 .3 4
12 .75
14 .7 1.0
setting,use a screwdriver as illus-
trated at left.
Setting
method [for Group B]
(1) Take off the seal, if sticked.
(2) Loosen the cover screw and open
the cover.
(3) Set tripping characteristics by turn-
For setting, turn ing the dials.
the arrow of each For turning the dials for character-
dial to the scale
position desired istic setting, use a screwdriver as
illustrated at left.
11
2.3.3 How to set characteristics of molded-case circuit breakers [1000~1600A frame
electronic overcurrent tripping type]
Electronic type
trip relay unit
(with cover)
Layout of
setting
terminals Seal Rated current switching screw
Cover
(1) Take off the seal, loosen the cover set screw and (1) Remove the seal, loosen the cover set screw, and
take off the cover. take off the cover.
(2) Loosen the rated current switching screw, move it (2) Loosen the short limit pickup current switching
to the position desired for setting by fingers, and screw, move it to the desired setting positon by
tighten it with 0.3 to 0.45 N·m torque. fingers, and tighten it with 0.3 to 0.45 N·m torque.
A slotted head screwdriver of 4.5mm width and A slotted head screwdriver of 4.5mm width and
Setting method 0.6mm thickness at the top is suitable for the set- 0.6mm thickness at the top is suitable for the set-
ting. ting.
(3) Take the label and the seal of the same value for (3) Take the seal out of the replacement labels.
setting value out of the replacement labels. (4) Attach the cover and stick the seal.
(4) Change the rated current label at the top end of
the handle.
(5) Attach the cover, and stick the seal.
SHORT-DERAY PICK UP
(Short time-delay tripping adjustable dial)
Set at a desired short limit trip characteristic.
AMPERE SHORT-DELAY
RATING PICK UP
PUSH TO TRIP
(Trip button) 1600
MED
PUSH TO TRIP
The button is for
mechanically tripping. 1200 TEST TERMINAL
Use the trip button for 2000 MIN. MAX.
Refrain from using this
sequence check only terminal normally as it is
and refrain from using TEST TERMINAL INSTANTANEOUS PICK UP
CURRENT 30000A (FIXED) for checking tripping
it for ordinary open characteristic using the
circuit operation. tester offered separately.
Remarks: For the electronic circuits of circuit breaker, control power is supplied from the built-in current transformer.
Accordingly, the breakers can be used with no regard to circuit voltage.
12
2.3.5 How to set inverse time-delay or instantaneous tripping characteristics of circuit breakers [Adjustable thermal or magnetic type]
Adjustable magnetic type
Applicable model NF125-SGW(RT), NF125-HGW(RT), NF160-SGW(RT), NF160-HGW(RT), NF250-SGW(RT), NF250-
HGW(RT), NF630-SP, NF800-SDP, NF1000-SSD, NF1250-SSD, NF1600-SSD, NF2000-S, NF2500-S
NF3200-S, NF4000-S, NV630-SP, NV1000-SB, NV1200-SB, NF-SJW, NF-HJW
Item Inverse time-delay or instantaneous tripping characteristic
Layout of
setting
terminals Inverse time-delay oparation or
instantaneous pickup current
switching screw
Set at the position effective
for fixing
Set at the position effective for fixing
Inverse time-delay oparation or instantaneous pickup current can be adjusted simply by turning the switching screw.
Setting For setting current of each notch, please refer to the operation characteristic curve.
Note 1. Trip current differs at middle position of the scale.
method Note 2. Turn the adjust button in arrow direction only.
Note 3. A slotted head screwdriver of 1mm thickness at the top is suitable for the setting.
2.3.6 How to switch voltage, sensitivity current and operating time (time delay type) of earth leakage circuit breakers
NV63-CW, NV125-CW, NV250-CW,
NV32-SW, NV63-SW, NV125-SW, NV250-SW
NV63-HW, NV125-HW, NV250-HW NV1000-SB, NV1200-SB
Applicable model NV125-RW, NV250-RW
NV400-CP, NV400-SP, NV630-CP, NV630-SP
Multi voltage, sensitivity switching in 3 steps Dual voltage, sensitivity switching in 2 steps
Sensitivity
selector
Operation
time switch
(time delay type)
Leakage Operation time
indication (time delay type) Sensitivity
Setting button
terminal
arrangement Test button
Trip button Arrangement
For setting, turn the
arrow mark on the
screw in the direction Cover (front) Cover (rear)
of a desired scale 200mA 500mA
position.
Switching screw
Cover screw
Control
Voltage Multi voltage types can be used for three circuit volt- Dual voltage type can be used for two circuit voltages
selection ages as it is. as it is.
• A slotted head screwdriver of 4.5mm width and The sensitivity selector is attached to the right side of the cover
0.6mm thickness at the top is suitable for setting. viewed from the front side.
• Stopping between two set values makes sensitivity To change from 500mA to 200mA, take the procedure state below
current or operating time unstable in some cases. while referring to the illustration given above.
Be sure to set at the position of each set value. (1) Loosen the cover screw and take off the cover.
• Refrain from applying unnecessary force at the time (2) Loosen the switching screw and move it to the left.
of setting. *Turn 5 to 6 times with a screwdriver suitable for the groove
Sensitivity, It can cause failure. width.
(Addequate operation torque is 0.05N·m max.) (3) Fasten the switching screw.
operating time Tighten the screw firmly as the bottom is to be connected elec-
trically. Cover tightening torque: 0.4 to 0.6N·m
A slotted head screwdriver of 6mm width and 0.8mm thick-
ness at the top is suitable for setting.
(4) Set the cover back in place and fix with the screw.
*For the time delay type of the above model, switching proce-
dure of operating time is the same as that of current switching.
13
2.3.7 How to change rated current, tripping characteristic and leak tripping characteristic of
earth leakage circuit breakers (electronic overcurrent tripping type)
Applicable model
NV100-SEP, NV100-HEP
NV250-SEW, NV250-HEW
Seal attaching
position
OVER LED (Red)
Setting dial arrangement
Test cover
Cover screw
(1) Take off the seal, if sticked.
(2) Loosen the cover screw and open the cover.
(3) Set tripping characteristics by turning the dials.
For turning the dials for characteristic setting,
use a screwdriver as illustrated at left.
Dial
1 A slotted head screwdriver of 3 mm width
For setting, turn
the arrow of each and 0.5 mm thickness at the top is suitable
dial to the scale po-
sition desired for the setting
2 At setting, refrain from applying force more
Tripping characteristics setting method
125 225 12 100 2 10 .06 .3 4 16 .7 1. 0 instantaneous tripping current li, keep the
Ir (A) TL (S) IS (×Ir) TS (S) Ii (×225A) IP (×Ir)
• For setting sensitivity current and operation time, open the cover in the
same procedure as for tripping characteristic setting.
(sensitivity current, operation time)
• A slotted head screwdriver of 4.5mm width and 0.6mm thickness is For setting, turn the arrow of each
dial to the scale position desired.
suitable for the setting.
• Stopping in the middle of each set values makes sensitivity current or
operating time unstable in some cases.
Be sure to set exactly at the position of each set value.
• At setting refrain from applying force more than necessary as such can
cause failures.
(Adequate operation torque is 0.05N·m maximum.)
14
Applicable model
Dial
(1) Take off the seal, if sticked.
For setting, turn
the arrow of each (2) Loosen the cover screw and open the cover.
dial to the scale (3) Set tripping characteristics by turning the dials.
position desired
For turning the dials for characteristic setting,
use a screwdriver as illustrated at left.
1 A slotted head screwdriver of 4.5mm width
300 4 56 8 10
250 350 3 7 6 12 and 0.6 mm thickness at the top is suitable
225 8 14
200 400 2 10 4 16 for the setting.
Tripping characteristics setting method
• For setting sensitivity current and operation time, open the cover in the
Setting method of leak tripping characteristics
same procedure as for tripping characteristic setting. For setting, turn the arrow
(sensitivity current, operation time)
• A slotted head screwdriver of 4.5mm width and 0.6mm thickness is of each dial to the scale
suitable for the setting. position desired.
• Stopping in the middle of each set values makes sensitivity current or
operating time unstable in some cases.
Be sure to set exactly at the position of each set value.
• At setting refrain from applying force more than necessary as such can
cause failures.
(Adequate operation torque is 0.05N·m maximum.)
15
2.3.8 How to switch voltage, sensitivity current and operating time of earth-leakage relay
Applicable
ZCT
1 2 3 4 5 ZCT ZCT
1 3
Switching terminal arrangment
240V a1 c1
Sensitivity current 1 2 3 4 5
selector 415V
COM OUT IN
Operating time Sensitivity current ZCT
selector selector
(time-delay type) Change-over 0.2A
switch 0.5A
1A
120V Operating time
selector
240V (time-delay type) 415V
a2 b2 c2
240V a1 c1
4 5 6 6 7 8 9 10
6 7 8 9 10
ZCT
7 8 9
a b c
• When source voltage is 120V in the above • When source voltage is 240V in the above • When source voltage is 240V in the above
drawing,connect to 4 and 5 terminals. drawing,connect to 1 and 2 terminals. drawing,connect to 6 and 7 terminals.
• When source voltage is 240V in the above • When source voltage is 415V in the above • When source voltage is 415V in the above
Voltage selection
• As lotted head screwdriver of 4.5mm width • As lotted head screwdriver of 4.5mm width • Turn the change-over switch with a screw-
at the top and 0.6mm thickness is suitable at the top and 0.6mm thickness is suitable driver to set the arrow at a desired scale
for setting. for setting. position.
Sensitivity,operation time
• Stopping between two set values makes • Stopping between two set values makes
sensitivity current or operating time un- sensitivity current or operating time un-
stable in some cases. stable in some cases.
Be sure to set at the position of each set Be sure to set at the position of each set
value. value.
• Refrain from applying unnecessary force • Refrain from applying unnecessary force
at the time of setting. at the time of setting.
It can cause failure. It can cause failure.
(Adequate operation torque is 0.05N·m (Adequate operation torque is 0.05N·m
max.) max.)
16
3. Installation
3.1 Notice for selection
For selection, refer to the catalog, technical data, specifications and other technical materials.
For any question concerning the selection method, please enquire us.
We are not responsible for any failure and damage caused by wrong selection.
3.2 Normal service conditions
Our circuit breakers of the standard specifications are to be used in the following standard conditions.
• Operating ambient temperature: –10 to 40°C (Average temperature for 24 hours, however, shall
not be higher than 35°C.)
• Relative humidity: 85% max. with no dewing
• Altitude: 2,000 m maximum
• Ambient of no excessive water or oil vapour, smoke, dust, salt content, corrosive substance, vibra-
tion, and impact
Expected service life (MTTF) under the above conditions is 15 years.
• Lowering ratio of operational current in special ambient temperature over 40°C.
50°C………0.9 times
60°C………0.7 times
Expected service life (MTTF) will be reduced compare with normal service conditions.
CAUTION
• Refrain from installing in any unusual environment of high temperature, high humidity, dust,
corrosive gas, vibration and impact. Electrification, fire, and malfunction can result.
17
3.3 Non-standard conditions
When operated under different conditions from the normal service conditions, it is necessary to take
the following measures against the operating conditions.
Even with such measures taken, however, service life may become shorter in some cases.
18
3.4 Inspection at arrival
(1) Make sure that the packing case is free from any abnormality such as breaking and wetting.
(2) Referring to the name plate, make sure that the delivered breaker is in conformity with your order.
(3) Check for the parts contained in the same package.
1 Mounting screws
2 Terminal screws
3 Insulation barriers (The barrier is contained in the same package for some models, but not for other
models.)
4 Terminal covers (The cover is contained in the same package for some models, but not for others.)
Note: At unpacking, be careful so that the sealing pags may not be scattered around.
Never drop the packing. Carrying in this manner is dangerous Holding on the attached lead wires of internal
as the breaker may drop. accessories for carrying as unreasonable force
is applied to the attached wires.
3.5.2 Storage
Storage temperature Avoid humid air. Avoid corrosive gas.
Relative humidity: 85% max.
40°C Ammonia
Keep within
this range. H2S
–20°C
Place of low dust content Housed in a packing case for storage Avoid direct sunlight.
19
3.6 Installation and connection
3.6.1 General
CAUTION
• Let a qualified person (electrician) carry out the electrical work.
• Before wiring, turn the upper circuit breaker to OFF. Make sure that no power is supplied to
prevent that the electrification can occur.
3.6.2 Installation
CAUTION
Install the breaker in normal environment. In case of any unusual environments such as high
temperature, high humidity, dust, corrosive gas, vibration and impact, the fire, the malfunc-
tion, and any operation failures can result.
Operating ambient temperature: Avoid humid air. Avoid corrosive gas. Avoid vibration and impact.
–10°C to 40°C Relative humidity 85% max.
40°C Ammonia
Use within H2 S
this range.
–10°C
Screw
20
Prevent the ingress of Never use thinner, detergent, and Do not adhere gum tape Avoid strong electro
water into the enclosure. other chemicals for cleaning. on the name plate. magnetic field.
It is likely to make letters on the The name plate may come off. When a transceiver is used, keep
plate illegible or to lower insu- it off at least 1 meter from installed
lation performance. places of the earth leakage circuit
breakers and circuit breakers with
electronic over-current release.
ON
3.6.3 Connection
CAUTION
• At the time of wire connection, tighten the terminals screws with the tightening torque shown
in Appendix 4.
Otherwise, fire can result.
• Loose fastening leads to overheat and can cause malfunction.
• Excessive fastening injures the screws and breaks the moulded case.
• Use a screwdriver suitable for screw shape.
Oil is prohibitive Don't deform the Insulate the live Use the terminal screws Use ring-type terminals
to threads studs and exposed part packed together. of suitable size.
Taping or
insulation tube
Long terminal screw makes Where a large number of
insulation distance insuffi- solderless terminals are
Insulation cient, while short terminal used for connection, con-
barrier
screw causes insufficient nect them referring to Ap-
When insulation distance isn't enough, or for tightening force, which pendix 4.
the live and exposed part of the terminal to leads to overheat.
prevent short-circuit or ground fault due to
metal piece dropping, applying insulation by
Fasten the conductors of taping, insulation tube, and insulation barrier.
rear connection type with- Of 400V and higher systems, in particular, un-
Oiling lowers frictions lead- out deforming the stud covered conducting part is dangerous.
ing to loose screw. Over Note. The model that a standard packs insu-
tightening causes breakage lation barrier together is to install insu-
of the screw. lation barrier.
21
3.6.4 Mounting direction
(1) For the following models, pay attention to attaching position as overcurrent tripping is of fHydraulic-
magnetic type and the tripping characteristic varies depending on mounting position. It is recom-
mendable to use them attached vertically.
Type
Vertical
100% 100% surface
107% 93% 115% 95%
ON
ON ON ON ON
OFF
ON ON
ON ON
OFF
OFF
ON
ON
110% 90% 120% 90%
ON ON
ON ON OFF
ON ON ON ON
ON
93% 95%
107% 115%
100% 100%
Mounting position which can
Rate of change of rated Rate of change of rated assure operation characteristic
current by mounting angle current by mounting angle for hydraulic-magnetic type
(For NF, NV, MB) (For CP)
(2) Thermal-magnetic type and electronic type are not affected by mounting direction.
22
3.6.5 Distances between circuit breaker and earthed metal parts
When short circuit current is cut off, ionized gas goes out of the exhaust port at the power source side
of the circuit breaker. At the power source side of the circuit breaker, provide the insulation distance
shown in the table so that the outgoing gas may not be bothered. Short circuit and ground fault can
also be resulted by dropped metal pieces, abnormal surge voltage generated in the lines, or by dust,
iron chip, and salt content. Insulate uncovered conductors at the power source side of the circuit
breaker exactly using insulation barriers, insulation tubes, and tapes.
Insulation barrier
(Insulation tube or tape will do)
Ceiling plate Ceiling plate Ceiling plate Ceiling plate
C
A
A
Side plate
D1
B2
B1
B1
B1 D2
D2
In case of
(Direct connection (Connection with (Bar connection) (Rear connection) NF400-CP NV400-CP
of wire) ring-type terminals) NF400-SP NV400-SP
Note:Vertical distance differs by each type of the lower circuit breaker. face of upper circuit breaker (rear connection) NF400-SEP NV400-SEP
A : Distance from circuit breaker to ceiling plate C : Insulated length of power source terminal of NF400-HEP NV400-HEP
B1 : Distance from lower circuit breaker to unco- circuit breaker (front connection) NF400-REP NV400-REP
vered conducting part of the terminal of upper D1 : Distance from a side of breaker to side plate NF1600-SS
circuit breaker (front connection) D2 : Side to side spacing of breakers NF1600-SSD
B2 : Distance from lower circuit breaker to the end a : Clearance specified in standard a
24
1 Cautionary instructions for using heat resistive wire
For using insulated wires of higher heat resistance than that of 600 V PVC insulated wire (allowable
temperature 60°C), it is necessary to take the following points into consideration.
For circuit breakers, size of test wire is stipulated by each test current in IEC60947-1
If size of connection wire is thinner than the test wire size, temperature of the breaker terminals
increases and overcurrent tripping operation characteristic may change in some cases. (Operating
time becomes shorter usually.) At motor load, for example, influence of change in operation charac-
teristic by difference in size of connection wire is insignificant and can be disregarded because the
load current is far lower than the rated current of the circuit breaker.
25
3.6.7 Breaker arrangements
(1) Connection of no-fuse breaker
1 Inverse connection
The illustration (a) is the standard connecting arrangement of line and load of the breaker termi-
nals.
Except for the models which accept inverse connection, connection of (b) may lower breaking
performance and inverse connection isn’t advisable.
Line Load
CAUTION ON ON
CAUTION
When 3-pole circuit breakers are used for single phase 2-wire lines, connect correctly in the
manner illustrated below. Otherwise, overcurrent fails operation and causes fire.
26
(2) Connection of earth leakage circuit breaker
CAUTION
1 Connect to a power source suitable for the rating of the circuit breaker. Otherwise, malfunc-
tion and failure can result.
Application of overvoltage outside the applicable voltage range can cause burning as the
earth leakage circuit breaker incorporates electronic circuits.
Application of lower voltage than the applicable voltage range also fails operation.
2 Where a circuit breaker is used for 1 phase 3 wire system and 3 phase 4 wire system, be
sure to connect the neutral wire to the neutral pole of the circuit breaker. Otherwise, opera-
tion fails at overcorrent.
120V Neutral wire
240V
120V
Neutral wire
OFF OFF
Neutral pole
(a) For single phase two wire system, refrain from us-
ing neutral pole.
Where a 3-pole earth leakage circuit breaker is used for
1φ2W
single phase 2 wire system, connect to the right and left
poles of the circuit breaker. Using the neutral pole fails op-
eration as the control power for the operation is supplied OFF
Line side
(c) Don’t connect in reverse. terminal
nection.
Types Applicable voltage
27
3.6.8 Instruction for connections
CAUTION
Use the applicable connection parts for breaker.
Otherwise it may result in fire.
Mount plate
OFF OFF
OFF
Wood screw
• Mount screws for steel plate and for wood plate (a part of NV models) are attached. For dimension, refer to Appendix 1.
Note) In some cities, mounting onto wood board is limited by fire defense code and others.
OFF
2 Connection
Wire connection with ring-type terminal
Taping or
insulation tube
● For connection using ring-type terminals, ● Cover up exposed and conducting part of ● Fasten the ring-type terminals so that the wires
refer to Appendix 4 for selection. ring-type terminals with tube or insulation of different poles are kept parallel with each other.
tape.
Bar connection
● When conductors are connected directly, process the
conductors to the outline dimensions stated in the
conductor machining drawing.
● To connect a conductor to a bar terminal, pay atten-
28
Clamp connection
● When connected directly to a terminal, insert the solid or stranded wire
straight, then fasten the terminal screws.
Ring-type terminals and bars can also be connected.
● For stranded wires, divided the strands for insertion, then fasten. Re-
16mm
3Insulation
(a) Insulation barrier
The insulation barriers are used to reinforce insulation between phases of circuit breaker terminals, and to prevent failure
caused by conductive foreign matter and dust. Be sure to use insulation barriers for the models of standard type.
To prevent problems, we are ready to mount the insulation barriers on the unit designated by you.
Insulation barrier
CAUTION
1. For the standard models, be sure to use insulation barriers unless some other
Arc discharge
effective means are taken such as terminal cover. side
2. To the models for which insulation barriers are packed together in both power
O
FF
29
4Terminal cover
This is used to avoid exposure of charged parts. Different kinds are prepared for
each application such as large size terminal cover (TC-L), small size terminal Stopper
projection
cover (TC-S), transparent terminal cover (TTC), Rear terminal cover (BTC), and
plug-in terminal cover (PTC).
● Quick set terminal cover
This cover can be attached simply by inserting into the mount hole on the circuit
breaker proper.
To disengage, slip off the cover stop projection by a finger or a screwdriver, then
pull out. (PTC is of screw fix type.)
❈ The models of NF125-SGW/HGW/RGW/UGW, NF160-SGW/HGW, NF250-
SGW/HGW/RGW/UGW are excluded.
Quick-set terminal
cover
Mount hole
NF125-SGW/HGW/RGW/UGW, NF160-SGW/HGW,
NF250-SGW/HGW/RGW/UGW Tapping screw (2pcs.)
DSN125-SGW, DSN160-SGW, DSN250-SGW Enlarged
view of Tapping screw
U-form projection Enlarged
Mounting
view of
1) Put the U-form projection in the hole of the breaker and push U-form projection
the terminal cover strongly to fasten it.
(Push the indicated place by the “ ” mark.)(Note)
2) Fix the terminal cover with tapping screws (in 4 positions
(Note)
with tightening torque 0.6 – 0.8 N·m).
Removing
1) Remove the tapping screws.
2) Push the tip of the U-form projection fully toward the “ ” (Note)
mark by the screw driver or a finger tip and pull out the ter- TCL-2GSW3 TCS-2GSW3
minal cover toward the “ ” mark.(Note) Note. except BTC or PTC
When a small size terminal cover (TC-S) is used, cover up the conducting part of the ring-type terminal with insulation tube or by taping but not
exceeding surface A.
;;
Small size terminal cover
Surface A
lnsulation tube
Wire
Note. No insulation barriers are needed with terminal covers are attached.
TC-S
30
(2) Rear connection
Rear connection type is for wiring from back side of the Stud set bolt, Circuit breaker set screw
panel and terminal connection and bar connection are Bolt A
End plate
applicable. Rear studs (with insulation pipe or insulation
base) are offered separately. Assembling is possible, there-
fore, by each user. For tightening torque, refer to Appen-
dix 2. Insulation base
1Bar stud
Stud
Mount hole
Bolt
Mount panel
;;
1. Clean the stud Circuit breaker lnsulation base (mould) rough guide of adequate range of tightening torque.
Stud
1. Attach the stud to the circuit breaker.
;;
;;
Stud fastening Circuit lnsulation base
bolt A breaker (Mold)
Direction can be changed Stud
by every 30°. Direction can be changed
;
Clean this contact face. by every 45°.
(except for NF800-UEP)
;
2. Attach the stud to the circuit breaker.
End plate
;
;
Clean off this contact face.
;
; ;;
2. Attach onto the panel.
Fasten bolt A Circuit breaker
; ;;
3. Attach onto the panel.
;;
Pan head
With the attached set screws, screw Panel
mount onto the panel using the
;;
mount hole on the circuit breaker. Pan head screw Panel
If the mount hole on the panel for fastening.
isn’t threaded, use nuts. (M4✕0.7✕35)(250AF is M4✕0.7✕55)
31
;
Assembling procedure (C) 2. Installing the stud in the breaker
NF125-SGW, NF125-HGW Stud bolt (M6) torque
Model to Be sure the plate is
NF160-SGW, NF160-HGW : 7.8 ~ 11.7N·m oriented correctly. 1
be NF250-SGW, NF250-HGW
assembled NF125-RGW, NF125-UGW Circuit Wipe this surface clean.
breaker 3
NF250-RGW, NF250-UGW 4 Stud
Size of
M6
bolt A
Tightening
torque 7.8~11.7
N·m
Install the
1 nut holder.
(Note 1) Refer to the catalog before
Breaker erecting the panel tabs.
NV400-REP
32
;
1Screw stud connection Generally, about 20kg power
is generated by arm. So,
10c tightening torque comes to
m 20N • m by grip-ping illustrated
position.
20N • m
200N (20kg)
Assembling procedure (A)
NF30-CS, MB30-CS, NV30-CS Tightening torque for screw stud
Model to be NF32-SW, NF63-CW, NF63-SW, NF63-HW
Tightening torque N·m
assembled MB30-SW, MB50-CW, MB50-SW
NV32-SW, NV63-CW, NV63-SW, NV63-HW Type (Ampere frame) Stud fastening screw A Conductor fastening nut B
1. Attach the stud onto the circuit breaker. <Nominal diameter of screw> <Nominal diameter of screw>
30A frame
Stud fastening Insulation Spring 50A frame 1 <M4> 2 <M6>
screw A Circuit base Nut C washer 60A frame
breaker (Mould) washer Conductor
fastening
nut B
Screw B
Clean this contact face.
Panel
Pan head screw for fastening
(M4✕0.7✕35)
Connection
conductor
Washer
(Brass tip plated) Fasten nut B
(Note)
Hold nut C with a wrench.
Be careful so as not to
apply unreasonable force
to the stud.
Nut B
Nut C
(Brass, tin plated)
33
(3) Plug-in type
Circuit breaker
Bolt A
Plug
Panel
● Assembling procedure
1. Attach the plug-in terminal Plug-in
block having the stud onto Panel terminal block
( )
the panel or the angle.
If the plug-in terminal Stud
block is separate type, Example of composition of plug-in type
Plug-in Conductor connection
place the circuit breaker terminal block Mounting screws
temporarily for positioning for the plug-in
the push-in terminal block. terminal
block ● Conductor connection
<Bar stud>
Circuit breaker Connection
2. Attach the connection con-
conductor
ductor to the plug-in stud.
Bar stud
Connection
conductor Screw E
Plug-in terminal block
( )
terminal block.
Take off the cushion
(foamed polystyrene of Plug-in
terminal block Connection
white) inserted into the tu- conductor
lip paart
● For fastening torque, refer to Appendix 2.
Screw A
(Note)
❈ At wiring, refrain from applying excessive tensile load onto the stud.
❈ Fasten the double-nut type in the following manner.
Connection conductor
(1) After fastening with standard
torque, fix with a spanner.
34
types for
NF125-SGW, NF125-HGW,
NF160-SGW, NF160-HGW, ⬉23
NF250-SGW, NF250-HGW
10
f8.5
(M8×25)
26
(M8×25)
26
● Assembling M8×25
9.5⬃14 N·m
58
M6×25
3.2⬃4.8 N·m
CUT OFF
M5×12
Coating plate Note:In this connection can not do the fixation on rear plate.
2⬃3 N·m
M6 M4×73
4⬃6 N·m
1.5⬃2 N·m
DUST
M5× Min.52
2.5⬃3.5 N·m
M4×73
1.5⬃2 N·m
TRIP!
M8×20
8⬃13 N·m
LN212A943
35
(5) Earth leakage relay
1Mounting
1. Mount the earth leakage relay and the ZCT unit separately. Refer to the
catalog for mounting dimension.
2. With the relay of interchangeable type, the relay unit and the ZCT unit
can be combined freely.
For the relay of combination type, be sure to combine the relay unit and
the ACT unit of the same manufacturing number. Conductor
Hole diameter of ZCT (mm) With primary conductor (A) Keep off at
Series least 10cm.
15 30 40 60 80 100 600~2000A 3200A
NV-ZBA
Interchangeable type
NV-ZSA
—
NV-ZU Combination type
Keep off at
least 10cm.
3. To avoid influence of outside magnetic field, mount the relay and the
ZCT at least 10cm off the conductors which a large current of over sev-
eral thousands ampere flows.
2Connection
1. For single phase three-wise system Pass the neutral wire 4. Don’t bend sharply the wires passed
and 3 phase 4-wire system, be sure also through ZCT through ZCT near the ZCT. When a
to pass the three or four wires includ- primary conductor of over 300A is
ing the neutral wire through ZCT. passed through, keep 30cm or more
(Pass the wire intended to conduct straight at one side.
load current throught ZCT.)
2. Where the line include a wire dedi- Don’t pass the earth wire 5. Refrain from grounding the lead wire
cated to grounding, refrain from through ZCT. of the ZCT.
passing the earth wire through ZCT.
(Don’t pass the wire not intended for
conducting load current through
ZCT.)
3. Bundle the wires passed through 6. Make sure that the setting is free
ZCT with clamp bands, for example, from any error as sensitivity current
as they may apply mechanical stress is switchable with some models.
to the ZCT when large current over
0.2
the rated overcurrent strength flows 0.5
1A
at a short-circuit failure and others.
7. Where the relay unit is connected to the ZCT unit, take the following
procedure. Example of single core shield connection
(NV-ZBA type)
Kind of lead wire used vs. sensitivity
To ZCT
Length of lead wire
Sensitivity Shield wire
1m 1m~3m 3m~7m
Core wire
30mA Single core shield wire
100 · 200mA of 0.5 to 2mm2
Stranded vinyl coated wire
500mA and more of 0.5 to 2mm2
Sensitivity 30mA
Notes 1. Number of turns of wire stranding is about 40turns/m.
2. Where single core shield wire is used, connect the core wire and
the shield wire in the right way acdording to the instruction manual. Test button Reset button
Example of NV-ZBA type is shown at the right.
Leakage indicator
0 100 200 Voltage (V)
36
3.6.9 Instruction for accessories
(1) Internal accessories
Alarm switch
AL 95 EAL Earth leakage alarm switch
This switch is for electrically indi- ON 98 The switch for electrically indicat-
cate tripping of the circuit break- Buzzer ing trip state of the earth leakage EALa
ers. 96 Lamp circuit breaker by ground fault. OFF
EALb
Smaller frame than 225A are pro- ON
EALc
vided with SLT as the standard
arrangement.
Auxiliary switch (It is attached to the back of the
AX 11
circuit breaker of built-in type.)
OFF Lamp 1
This is for indicating ON/OFF
state of the circuit breakers elec- 14
trically. 12 Lamp 2
37
(2) AL (Alarm switch), AX (Auxiliary switch)
● AL (Alarm switch) is for indicating trip state of the circuit breakers electrically.
● AX (Auxiliary switch) is for indicating ON/OFF state of the circuit breakers electrically.
30 S
(V) V
10
5
For lower area than above bottom limit of applicable load, use
the switch for minute load.
38
(3) SHT (Shunt trip)
■ The device to trip circuit breakers electrically from a remote position.
■ Allowable operating voltage range is 70 to 110% of the rated voltage.
32(30)·63A Frame
125A Frame 50
(NF125-SGW/HGW/RGW/UGW are excluded) AC100-240
NF-C·S·H·U 380-550
Equipped 120 15 or less
MB (Compatible to 50 and 60Hz.)
160·250A Frame DC100-125
60
NF125-SGW/HGW/RGW/UGW
39
(4) UVT (Under voltage trip)
(a) This device make it possilble to turn ON the circuit breaker after resetting manually when supply
voltage is recovered at least to 85% after dropping to 70 to 35% or lower and tripping the
breaker.
(b) Be sure to practice reset closing operation by applying the specified voltage to the coil of UVT.
(c) Refrain from reset closing operation of the circuit breaker without energizing the UVT as it
accelerates wear of the tripping latch and an cause failure.
(d) Be sure to set a small size NFB or fuses in the UVT circuit.
1 Coil rating of UVT
Model Voltage Input Operation time
Type name of breaker
group Standard voltage Special voltage (Note1) (VA) (Note 2)
NF32-SW, NF63-CW, NF63-SW, NF63-HW,
1 NF160-SW, NF160-HW, NF250-CW,
NF250-SW, NF250-HW AC100-110/120-130 selectable
MB30-SW, MB50-CW, MB50-SW, MB225-SW AC200-220/230-250 selectable
2 NF125-CW, NF125-SW, NF125-HW, MB100-SW AC380-415/440-480 selectable – 5 30 or less
(Compatible to 50 and 60Hz.)
NF125-SGW, NF125-HGW, NF125-RGW, NF125-UGW, DC100/110 selectable
3 NF160-SGW, NF160-HGW, NF250-SGW, NF250-HGW,
NF250-RGW, NF250-UGW
NF400-CP, NF400-SP, NF400-SEP, NF400-HEP, NF400-REP, AC110-120 DC24
NF400-UEP, NV400-CP, NV400-SP, NV400-SEP, NV400-HEP, AC100-110 AC220-240 DC48
NV400-REP, NF630-CP, NF630-SP, NF630-SEP, NF630-HEP, AC200-220
4 AC380-415 DC110 5 5~30
NF630-REP, NF630-UEP, NV630-CP, NV630-SP, NV630-SEP, AC400-440
NV630-HEP, NF800-CEP, NF800-SDP, NF800-SEP, NF800-HEP, AC440-480
DC100 AC500-550
NF800-REP, NF800-UEP, NV800-SEP, NV800-HEP
CAUTION
Keep the control voltage within the range of the rated voltage of UVT. Applying higher control circuit
voltage can cause burning of the UVT coil and fire. Applying lower control circuit voltage can result in
malfunction and noise generation in the case of AC.
40
(b) NFE type
UVT of NFB type is so composed to detect lowered voltage by the UVT controller attached outside
and to trip by the UVT mechanical unit incorporated in the circuit breaker. Time lag of about 50 msec
is given to the operating time.
The UVT mechanical unit doesn’t trip even if the coil of the unit isn’t energized so long as the handle
of the circuit breaker if OFF or reset. (Except for motor type electrical operation, however.)
NFE proper
UVT controller
UVT terminal
Short circuit protection
J2
J2
such as fuse
D1 D2
J1
J1
Connection diagram of UVT controller (with LT)
41
(5) Cassette accessories
130~250 A frames
The cassette accessories, AL, AX, AL+AX, and SHT can be installed to the following models by each user.
Type name of accessories (indicated by the attached name plate)
Kind of accessories
Applicable models Group name
AL AX AL AX SHT ( 1) UVTN or UVTS) ( 2)
UVTNA130-05SWR(S) UVTNA480-05SWR(S)
NF32-SW NF63-CW/SW/HW SHTA240-05SWR(S)
05 AL-05SWL(S) AX-05SWL(S) ALAX-05SWL(S) UVTNA130-05SWL(S) UVTNA480-05SWL(S)
NV32-SW NV63-CW/SW/HW SHTA550-05SWR(S)
AL-05SWR(S) AX-05SWR(S) ALAX-05SWR(S) UVTNA250-05SWR(S) UVTND110-05SWR(S)
MB30-SW MB50-SW SHTD125-05SWR(S)
UVTNA250-05SWL(S) UVTND110-05SWL(S)
UVTNA130-1SW UVTND110-1SWRS
UVTNA130-1SWRS UVTND110-1SWLS
NF125-CW/SW/HW AL-1SW AX-1SW ALAX-1SW SHTA240-1SWR(S)
1 UVTNA130-1SWLS UVTSA130-1SW
NV125-CW/SW/HW RW AL-1SWLS AX-1SWLS ALAX-1SWLS SHTA550-1SWR(S)
UVTNA250-1SW UVTSA130-1SWRS
MB100-SW AL-1SWRS AX-1SWRS ALAX-1SWRS SHTD125-1SWR(S)
UVTNA250-1SWRS UVTSA250-1SW
UVTNA250-1SWLS UVTSA250-1SWRS
UVTNA480-1SW UVTSA480-1SW
UVTNA480-1SWRS UVTSA480-1SWRS
UVTNA480-1SWLS UVTSD110-1SW
UVTND110-1SW UVTSD110-1SWRS
UVTNA130-2SWR(S) UVTNA480-2SWR(S)
NF250-CW/SW/HW SHTA240-2SWR(S)
AL-2SWL(S) AX-2SWL(S) ALAX-2SWL(S) UVTNA130-2SWL(S) UVTNA480-2SWL(S)
NF160-SW/HW 2 SHTA550-2SWR(S)
AL-2SWR(S) AX-2SWR(S) ALAX-2SWR(S) UVTNA250-2SWR(S) UVTND110-2SWR(S)
NV250-CW/SW/HW/RW/SEW/HEW SHTD125-2SWR(S)
UVTNA250-2SWL(S) UVTND110-2SWL(S)
SHTA240-2GSWR(S)
SHTA550-2GSWR(S) UVTSA130-2GSWR(S) UVTSA130-2GSWRN
NF250-SGW/HGW/RGW/UGW AL-2GSWL(S) AX-2GSWL(S) ALAX-2GSWL(S) SHTD125-2GSWR(S)
2G UVTSA250-2GSWR(S) UVTSA250-2GSWRN
NF160-SGW/HGW AL-2GSWR(S) AX-2GSWR(S) ALAX-2GSWR(S) SHTA240-2GSWRN
UVTSA480-2GSWR(S) UVTSA480-2GSWRN
NF125-SGW/HGW/RGW/UGW AL-2GSWN AX-2GSWN ALAX-2GSWN SHTA550-2GSWRN UVTSD110-2GSWR(S) UVTSD110-2GSWRN
SHTD125-2GSWRN
Model designation code “S” denotes that the vertical Notes: (1) NV models are excluded.
lead-wire terminal block (SLT) is added (2) UVTN Non-Synchronous closing
Kind of Group name (if not specified, lead wires are extended).
accessories “N” denotes “internal terminal.” UVTS Synchronous closing
With the UVTS model, the breaker can be reset even
if the voltage is not applied.
SHT A130 1 SW R S NV250-SEW/HEW models cannot be produced.
Remarks: (1) Refer to Combinations of Accessories for
details of combinations and poles.
Voltage Installation position (2) A cassette type of AL cannot be installed on circuit
SHT UVT R: right-pole installation (Note1) breakers with MG switch.
L: left-pole installation
A048 : 24-48VAC A048 : 24-48VAC selectable
A240 : 100-240VAC A130 : 100-110/120-130VAC selectable Blank: either pole installation
A550 : 380-550VAC A250 : 200-220/230-250VAC selectable
D012 : 12V DC A480 : 380-415/440-480VAC selectable
D036 : 24-36V DC A600 : 500-550/600VAC selectable
D048 : 36-48V DC D110 : 100/110V DC selectable
D125 : 100-125V DC
D250 : 220-250V DC
Mount position
Series NF-C S H U, MB NV-C S H U
NF32-SW NF32-SW(3P) NV32-SW
NF63-CW/SW/HW NF63-CW/SW/HW(3P) NV63-CW/SW/HW
NF125-CW/SW NF125-CW(3P), NF125-SW(3P, 4P) NV125-CW/SW/HW
NF125-HW, NF125-SGW/HGW NV250-CW/SW/HW
Type name NF125-RGW/UGW NV250-SEW/HEW
NF160-SW/SGW/HW/HGW NV125-RW, NV250-RW
Num NF250-CW/SW/HW
ber NF250-SGW/HGW
of p
oles NF250-RGW/UGW
MB30-SW, MB50-CW/SW
MB100-SW, MB225-SW
Accessories 2-pole 2-pole, 3-pole, 4-pole 2-pole, 3-pole, 4-pole
AL
AX
(Note 1) (Note 1)
AL+AX
(Note 2)
AX+SHT or UVT
(Note 1)
AL+AX+SHT or UVT (Note 2)
Breaker handle
AL AX SHT or UVT
Left pole Right pole
NF400-CP/SP/SEP/HEP/REP/UEP AX-4SP
SHT-4SP
2, 3 for right pole — AX-4SPRS —
NF630-CP/SP/SEP/HEP/REP/UEP SHT-4SPRS
AX2-4SPRS
NF800-CEP/SDP/SEP/HEP/REP/UEP 2, 3, 4 for left pole
NV400-CP/SP/SEP/HEP/REP AL-4SPL AX-4SP ALAX-4SPL SHT-4SP
NV630-CP/SP/SEP/HEP 3, 4 for left pole AL-4SPLS AX-4SPLS ALAX-4SPLS SHT-4SPLS
NV800-SEP/HEP AL2-4SPLS AX2-4SPLS
Note 1. AX or SHT with leads is common use for right and left poles, so can be mounted in either right and left poles.
2. For mounting plural AL, AX, or AL+AX with leads, install necessary number of the single type accessories.
3. For mounting three or more AL and AX with SLT, order separatelly.
4. For the type with SLT mounting to right pole of 4-pole circuit breaker, order separatelly.
Mount position
FrameA 400 600·800
Mount position
L1 L2 L3 R2 R1 L1 L2 L3 L4 R4 R3 R2 R1
ON Accessory
AL — — — — — — — —
L1 L2 L3 L4 R4 R3 R2 R1 AX — — — Note1.
AL+AX — — — — — — — — —
OFF — — — Note 1. — —
SHT
Note 1. AX in R2 and SHT in R3 · R4 can’t be mounted together.
2. Accessories can’t be mounted into R1, R2, R3, or R4 for earth leakage
circuit breakers.
43
How to attach cassette accessories
CAUTION
• For mounting and dismounting the cassette accessories, be sure to drop voltage of the circuit breaker and the
accessories to zero as electrification can result.
Burning can take place should the circuit breaker operation for breaking.
• Never attach while the handle is at ON, OFF position. The parts are broken and can cause failure.
1Before opening the cover, press the trip button, and loosen 2Then open the cover.
the screw of the breaker cover.
Trip
3If any middle cover or other accessories are attached, remove them before mounting the cassett accessory. (To the circuit
breaker having a middle cover, be sure to attach the middle cover while no cassette accessories are mounted.)
➀
click
sound
• With lead wires • With the lead wire terminal block SLT
For 600~800A frames with lead wires, fix the lead wires on
the side of the breaker by the attachment.
5Close the cover and tighten the screws. 6Close the cover and tighten the screws.
Attach the name plate packed together onto a side of the
circuit breaker. (except with SLT type)
Fastening torque
Name plate
7Attach assembling the accessory, be sure to check for smooth operation before use.
45
(6) EAL (Earth leakage alarm switch)
This switch is for electrically indicating tripped state of an earth leakage circuit breaker at a ground
fault.
Operation of EAL switch Rating of EAL (400A frame and above)
Condition of AC DC
Contact condition of EAL switch Microswitch Current A Current A
circuit breaker Voltage Voltage
used Resistance Induction Resistance Induction
225A fram and 78 (open) V V
load load load load
Tripped by overload below 77 460 – – 250 0.2 0.2
or short-circuit fault S 250 3 2 125 0.4 0.4
ON·OFF 400A fram and 98 (open) 125 5 3 30 4 3
96 (closed)
above 95 460 5 2 250 0.3 0.3
V 250 10 10 125 0.6 0.6
225A fram and 78 (closed)
125 10 10 30 10 6
below Note 1. Use the switch for micro load for lower area than Minimum
Tripped by ground 77
fault rating shown bellow.
400A fram and 98 (closed)
96 (open)
above 95 AC · DC
(V)
60
Minimum rating
5
50 600 (mA)
Rating of EAL switch (250A frame and below)
AC Vertical type lead wire
Voltage Current A terminal block Rating of corrosion-proof EAL switch (400A frame and above)
V Resistance load Induction load 78 Indicator lamp Micro switch AC DC
200 3 2 (Example)
of corrosion- Current A Current A
100 3 2 L2 Control Voltage Voltage
power proof type Resistance Induction Resistance Induction
Specify voltage as the switch for L1(77) source V V
used load load load load
100V differs from that for 200V. 460 – – 250 0.2 0.2
For corrosion-proof type
Control power is necessary at each voltage. For wire connection, ST 250 3 2 125 0.4 0.4
see the drawing at right. 125 5 3 30 4 3
460 1 0.5 250 0.3 0.3
VT 250 5 4 125 0.4 0.4
Rating of micro load EAL switch (400A frame and above) 125 5 4 30 5 3
AC DC If the breaker is treated by the 1st kind moisture-fungus treatment or
Microswitch Current A Current A by added corrosion-proof treatment, the micro switch of corrosion-
Voltage Voltage
used Resistance Induction Resistance Induction proof type is to be used.
V V
load load load load
SB 125 0.1 – 30 0.1 –
VB 125 0.1 – 30 0.1 –
For use in micro current area, please enquire us separately.
(Note) For model of breakers to be assembled each type of micro
switch, refer to the catalogue.
CAUTION
1 Connect the wires in the right way. Wrong connection can cause malfunction or short circuit.
Connection which
causes short-circuit
Malfunction
78 78 78
L2 L2 L2
Before starting operation, be sure to press the test button of the earth leakage circuit breaker to make
sure of operation. The test button doesn’t operate unless voltage is applied between the right and left
pole of the breaker.
46
(7) TBM (Test button module)
1 This module is used for testing earth leakage circuit breaker remotely while applying voltage.
For time lag type, keep applying voltage for more than two seconds.
2 The voltage application system is insulated from the main circuit and SHT of MCCB can be used
commonly with the control sequence.
3. Resetting the circuit breaker while applying voltage to the TBM and closing again trips the breaker.
Reduce voltage to zero, therefore, when the circuit breaker is closed again.
4. Number of times of testing is 1,000 times. Refrain from testing over 1,000 times.
5. The distance of wiring to the switch is 100m and below.
47
(8) MG (Insulation switch)
This switch is attached for insulation resistance measurement between rihght and left poles of the models to
which control power is supplied through the right and the left poles, such as earth leakage circuit breaker.
Operation of insulation switch
Connecting a switch interlocked with the handle to one con- Conditioncircuit
of
breaker OFF or trip ON
trol circuit and turning off the circuit breaker opens the control
circuit making it possible to carry out insulation resistance
measurement. Even with the standard breakers, insulation Condition
of
resistance measurement is possible between a charged part Insulation
and ground, the left pole and the middle pole, and between switch
the middle pole and the right pole. Insulation resistance mea-
Insulation switch (Open) Insulation switch (Close)
surement between the left pole and the right pole only reduce
the indication to zero but never breaks the ELCB.
NV100-SEP NV100-HEP
—————
NV225-SEW NV225-HEW Press the reset
NF400-SEP NF400-HEP NF400-REP
Standard AC100V or
Option switch or turn off
NF400-UEP NF600-SEP NF600-HEP equipment AC200V 2A
control power.
NF600-REP NF600-UEP NF800-CEP
NF800-SEP NF800-HEP NF800-REP
option DC24V-AC100-200V
NF800-UEP 20mA
NV400-SEP NV400-HEP NV400-REP
NV600-SEP NV600-HEP
NV800-SEP NV800-HEP
1 Pre-alarm LED The LED starts blinking on the circuit breaker when load current exceeds the preset current, then changes to
continuous glowing when pre-alarm output is given.
2 Solid state relay output Open the upper cover of the circuit breaker, connect the connector of the lead wire packed together, and use it
as the lead wire outlet. In this case, only the lead wire output of the internal accessories can be attached to the
right pole. (For flush plate type, the outlet is manufactured in advance as PAL mount.)
3 Pre-alarm module SLT is attached as a standard equipment and is used as the control power source of AC100V or AC200V. In this
case, no other internal accessories can be attached to the right pole. (Auto resetting is also applicable.)
Pre-alarm characteristics (100 and 250A frames) Pre-alarm characteristics (400 to 800A frames)
10hr
4h 5hr
Pre-alarm pick-up current
2h Pre-alarm 2hr
1h Operating 1hr
Characteristics 30min PAL OUT LED
30min 20min
14min
RESET
Reset switch
20min
10min LTD operating time TL
Working Duration
CAUTION
Be careful to electrification, ground fault, and contact with the main circuit as PAL output is internally
connected with the control power source.
48
3.6.10 External accessories
(1) Electric operation device
1 Spring-charged type (1)
• Electric operation : When ON switch is turned off, a relay drives the motor to reset the latch mecha-
nism, instantaneously turning the breaker ON with the accumulated force of the
input spring. When OFF switch is turned off, the relay drives the motor to turn
the breaker OFF (reset) and charge the input spring at the same time.
• Manual operation : Shift MANU/AUTO selector switch on the cover top to MANU then press ON
button. The latch mechanism is reset and the accumulated force of the input
spring instantaneously turns on the breaker ON.
Turning OFF (resetting)
Draw out the manual handle and reciprocate it a few dozen times to turn the
breaker OFF (reset) and charge the input spring at the same time.
(ii) The electric operation circuit is set up so OFF switch takes priority. Even if ON switch and OFF
switch are pressed at the same time, therefore, the breaker is turned OFF without fail.
(iii) For the automatically reset type, use a breaker alarm switch (micro-loading) and connect ter-
minals S1, S2 and S4 as shown in following Fig. Since the operation circuit has an ON signal
one-shot output circuit in addition to the function to give priority to the OFF switch, an auto-
matic resetting system with an UVT is set up and such a cycle as ON (invalid) → trip → OFF
(reset) does not repeat even if the breaker has been tripped without UVT excitation when the
ON signal is continually transmitted.
P1
Operation power supply
P2
Power
S1 supply
S2 module
ON
S4
OFF
AL“a”
(iv) If a reset preventive UVT is installed and the UVT has been unexcited when the breaker is
OFF, the breaker mechanism trips but the electric operation unit breaker OFF status is kept
indicated. Even if the UVT is excited afterward, the breaker mechanism is kept tripped and
turning the switch ON trips the mechanism. In such a case, the electric operation unit indicates
tripped (ON is indicated for the 250AF except for NF250-HGW). After resetting, turn on the
breaker OFF again.
(v) Any articles using same voltage incorporate switching power supply, so they may interfere with
any communications equipment (AM radio, for instance) used in their vicinity. In such a case,
provide a noise filter on the input side. An electrolytic capacitor is used as switching power
supply. Draw your due attention to the use and custody at high temperature.
49
Caution on manual operation
[Turning ON]
(i) Shift MANU/AUTO selector switch to MANU. When MANU has been selected, the electric
operation circuit will be automatically open.
(ii) Press ON button. The latch mechanism is disengaged and the accumulated force of the input
spring turns the breaker ON. The ON button operating load is approx. 50 N.
[Turning OFF]
(i) Shift MANU/AUTO switch to MANU. When MANU has been selected, the electric operation
circuit will be automatically open.
(ii) Draw out the manual handle and reciprocate it a few tens of times to turn the breaker OFF and
charge the input spring.
<<For 250AF>>
Reciprocate the manual handle until the breaker status is indicated as "OFF".
The breaker can be turned OFF without shifting the selector switch to MANU. However, the
breaker is also controlled by remote operation, so operate the handle after shifting the selector
switch to MANU.
(iii) After reciprocating the handle, be sure to return the MANU/AUTO selector switch to AUTO.
When the switch has returned to AUTO, the electric operation circuit is automatically closed.
Note: When MANU is selected with the MANU/AUTO selector switch, the breaker cannot be elec-
trically (remotely) operated. So be sure to return the selector switch to AUTO after ending
manual operation.
50
Caution on OPEN (trip) button operation
(i) Shift MANU/AUTO selector switch to MANU. When MANU has been selected, the electric
operation circuit will be automatically open.
(ii) Press OPEN (trip) button and the breaker trips. The OPEN (trip) button operating load is approx.
5 N.
(iii) After pressing OPEN button, be sure to return the MANU/AUTO selector switch to AUTO.
When AUTO has been selected, the electric operation circuit is automatically closed.
Note 1: The breaker is structured so OPEN (trip) button cannot be pressed when the breaker is
OFF.
Note 2: Be sure not to turn the breaker OFF with the OPEN (trip) button pressed. Otherwise the
electric operation unit may be damaged.
(ii) Remove 2 setscrews from the electric operation unit, and remove the electric operation base
from the breaker.
(iii) Set the breaker sensitivity current selector switch and the earth leakage tripping time selector
switch.
(iv) After setting them, install the electric operation base and the power supply module.
(v) Replace the sensitivity current nameplate and the earth leakage tripping time nameplate with
those for the newly set ones.
51
(a) How to install
The users who purchased a single electric operation unit for 63/125AF or NF250-HGW are requested
to take the following procedure before installing the electric operation unit on the breaker:
Note: If the indicating plate is not inserted, the electric operation unit breaker status is kept indi-
cated as ON.
52
Operation circuit terminal
cover (standard accessory)
Operation circuit terminal Power supply module
Power supply block (M3.5 thread)
module setscrew
P1 P2 S1 S2 S4
OFF lock plate
Fig. 3 Fig. 4
M4 nuts
Packed together
AUTO
Breaker spec.
nameplate
Rated current
nameplate
Sensitivity current/Operating
time nameplate
Fig. 11 Fig. 12
53
Cover setscrew Indicating plate hole Indicating plate
Fig. 1 Fig. 2
Fix block on
the rear side of cover.
1
The block prevents the plate
Direction for the plate. from bursting out of cover.
Fig. 5
Panel
Power supply module
Terminal cover
M3×8 0.4N·m
Fig. 9 Fig. 10
Terminal cover
M3×8 0.4N·m
Terminal cover
Mtg screws for MDS.
M4 1.5N·m
Mtg screw. Mtg screw.
M3×12 0.6-0.8N·m M4×8 1.5N·m
Fig. 13 Fig. 14
54
(i) For the Front and Rear connection type
(1) Untighten the power supply module setscrew to remove the power supply module from the
electric operation unit.
(2) Turn the breaker OFF (Fig. 6).
(3) Set the electric operation unit to "Charge" (Fig. 7)
(or "OFF" for 250AF except NF250-HGW).
(4) Install the electric operation base on the breaker with attached 2 pcs. each of electric operation
unit setscrews and nuts (Fig. 8)
(The users who purchased the breaker equipped with an electric operation unit need not take
steps (2) - (4) above).
(5) Install the breaker equipped with an electric operation base on the panel with 2 breaker set-
screws (Fig. 9).
(6) Inserting to fix the power supply module into the electric operation base groove with a power
supply module setscrew (Fig. 10).
Note: Before installing the power supply module, complete wiring the breaker and installing the
terminal cover. After installing the power supply module, the breaker cannot be wired and the
terminal cover cannot be installed.
(7) Paste the attached nameplates on the electric operation unit cover as shown in Fig. 11.
(1) Untighten the power supply module setscrew to remove the power supply module from the
electric operation unit.
(2) Turn the breaker "OFF."
(3) Set the electric operation unit to "Charge" (or "OFF" for 250AF except NF250-HGW).
(4) Install the breaker on the plug-in terminal block with 2 breaker setscrews (Fig. 12).
(5) Tighten the electric operation base and the breaker to the plug-in terminal block with attached
2 electric operation unit setscrews (Fig. 13).
(6) Insert to fix the power supply module into the electric operation base groove with a power
supply module setscrew (Fig. 14).
Note: Before installing the power supply module, complete wiring the breaker and installing the
terminal cover. After installing the power supply module, the breaker cannot be wired and the
terminal cover cannot be installed.
(7) Paste the attached nameplates on the electric operation unit cover as shown in Fig. 11.
55
(b) Operation circuit connection
(i) Connect the operation power supply to the operation power supply terminals (P1 and P2).
There is no polarity.
(ii) Connect ON switch and OFF switch to the operation switch terminals (S1, S2 and S4). For the
operation switches, use the micro-loading switches (with approx. DC 24 V, 30 mA of switching
capacities) prepared at your side.
Note: For the voltage sharing items, the rush current (capacitor charging current 60A 1msec) men-
tioned later flows to the breaker and the fuse in the power supply circuit. So select the items
with care to prevent fusion and operation errors.
P1 P.S
Operating Power K3
Uc SW1
power supply Supply K2 K3
P2 M
X
S1
SW2
K2 K3
S2
K1 K2
ON
K1
S4
K1
OFF
(RESET) The breaker indicates OFF and the electric operation
unit is Charged.
P.S Switching power supply (AC 100-240 V/DC 100-250 V types only)
SW1 MANU/AUTO selector switch
SW2 Charge/Discharge detecting switch
M Motor
K1 Relay (for OFF switch)
K2 Relay (for the motor)
K3 Relay (for the motor)
X Pumping preventive circuit
The withstand voltage between the operation circuit terminals (P1, P2, S1, S2 and S4) and the
ground is AC 1500 V.
56
2 Motor-operated type (1)
• Electrical Operation : Rotary motion shall be converted into reciprocating rectilinear motion through
DC motor → Speed reducer → Cam mechanism. Operation is by turning ON
and OFF (reset) the circuit-breaker.
• Manual Operation : After selecting MANUAL for the changeover knob, insert the hexagonbar span-
ner provided as accessory. Turn ON/OFF (reset) according to the arrow mark.
After operation, never fail to return the knob to AUTO side. (Note that the exter-
nal signal prohibits ON/OFF while the knob is thrown to MANUAL side.)
(a) Precaution to be taken for handling
CAUTION
Every time the electric operation unit is dismantled or remounted, turn off the master circuit-
breaker, switch off the operational circuit to make sure that the main and operational circuits
are not alive (charged). Beware of electric shock.
(ii) Because the electric operation circuit has been designed with priority given to OFF state, the
circuit-breaker will stop under OFF condition without fail even if ON and OFF operational switches
are erroneously depressed simultaneously.
Even when ON operational switch is inadvertently manipulated with OFF signal applied con-
tinuously, the ON signal will be canceled to maintain the OFF state.
(iii) If the circuit-breaker trips from OFF state due to non-excitation of UVT or to the manipulation of
trip button, electric operation mechanism turns on idly for automatic shift to reset operation
standby (OFF operation signal receivable). Therefore the operational sound of electric opera-
tional portion heard after OFF → Trip is not abnormal. In the case of the motor-operated type
(1), the corrective action as above enables to reset by OFF operation signal irrespectively of
the circuit-breaker trip from ON or from OFF.
(iv) In case when UVT is provided, the user is requested to constitute an interlocking circuitry so
that OFF operational signal should not be applied continuously while the UVT is under no
voltage. (Applicable for NF50-HC and MB50-HC only).
S1
Ex.
ON
S2 Motor - operated
device
Z OFF
S4
Circuit Breaker
D1
Control supply UVT
Us Z
voltage
D2
57
(v) For automatic resetting system, use the alarm switch (for microload) of the circuit-breaker and
wire the operation switch circuitry (between terminals S1, S2, and S4) as shown in Fig. 1.
Fig. 1
Motor-operated device
S1 S2 S4
AL“a”
OFF
ON
Notice that in a circuitry without interlocking as shown in Fig.2, application is made immedi-
ately after resetting if the circuit-breaker trips when ON signal is applied continuously. Take
care not to allow the continuous application of ON signal.
Motor-operated device
Fig. 2
S1 S2 S4
AL“a”
OFF
ON
(vi) When the automatic resetting is configured with UVT, the action OFF (reset) → Trip OFF (re-
set) → Trip will be repeated if UVT is under no voltage with the wiring as shown in Fig. 1.
In the event that the voltage of UVT and that of electrical operation fall gradually, the operation
may continue to run even if the electrical circuit-breaker trips by UVT, repeating the action OFF
→ Trip to come finally to a standstill at an unstable position. In such a case, the operation may
be disabled even when the power supply restores.
These are the reasons why the circuitry should be built up so that the power supply is cut off of
the electric operation before the circuit-breaker trips by UVT.
Fig. 3 and 4 are exemplary cicrcuits, where the voltage relay cuts off the power supply of
electric operation when the voltage of UVT drops. Any circuitry will go if the conditions as
above are satisfied. (Applicable for NF50-HC and MB50-HC only)
Z
Control circuit P1
Uc
voltage
P2
Motor - operated
S1
device
ON
S2
OFF
S4
Circuit Breaker
ALa
D1
UVT
Z
D2
Z
Control circuit P1
Uc
voltage
P2
Motor - operated
S1
device
ON
S2
OFF
S4
Circuit Breaker
ALa
D1
Control supply UVT
Us Z
voltage
D2
(vii) Any articles using same voltage incorporate switching power supply, so they may interfere with
any communications equipment (AM radio, for instance) used in their vicinity. In such a case,
provide a noise filter on the input side. An electrolytic capacitor is used as switching power
supply. Draw your due attention to the use and custody at high temperature.
58
Precaution to be taken at manual operation
(i) Throw the MANUAL/AUTO knob to MANUAL side.
,
Note that the electric operation circuit closes automatically as soon
as this knob is thrown to MANUAL side.
RESET
(ii) Pull out the manual handle and insert it into the hexagonal hole for OFF ON
Manual handle apature
mounting the handle.
AUTO
(iii) Turn ON (clockwise) or OFF (reset, counterclockwise) according to
the arrow mark above the manual handle mount hole. MANUAL/AUTO selector
MANUAL
(iv) Never fail to house the manual handle in its original position after
completion of the manual operation.
Note 1. The electric operation may make an idling action when the knob is abnormal because it is
a corrective action to remedy the position of the electric operation cam in match with the
position of the circuit-breaker the electric operation cam ON and the position of circuit-
breaker handle OFF).
Note 2. No electric operation is possible if the manual/auto changeover knob is on MANUAL side.
Never fail to change the knob over to AUTO after completion of the manual operation.
59
(b) How to mount
(i) Cases of front connection and rear connection types as well as plug-in type [NF50-HC
and MB50-HC]
Mount the units as shown in the drawing below using the four attaching screws to be found
in the package of the circuit-breaker.
a) When it is difficult to remove and refit the attaching screws for the circuit-breaker (A) due
to the screwdriver contacting the electrical operation unit, use another screwdriver with
longer handle (of the order of 150 mm in length).
b) In case of plug-in type, mount first the plug-in terminal block on the mounting plate and
then fit the electric operation type circuit-breaker.
Attaching screw for
circuit-breaker (A)
(A) (B)
(B) (A)
50AF
Fixing screw
ON OFF Trip for electrical operation unit
Attaching screw for electrical
color red green yellow operation unit and circuit-breaker (B)
Manual handle
Attaching screws for the electrical Action display mount hole
operation unit cover MANUAL/AUTO
changeover knob
Mounting plate
Trip button
Attaching screws for the Attaching screw for
electrical operation unit cover circuit-breaker (A)
(ii) Cases of front connection and rear connection types as well as plug-in types (For the
models other than the above)
a) Loosen the two attaching screws for electrical operation unit (B) to detach it from the circuit-
breaker, when the nuts put into the back of the circuit-breaker, which are for temporary
setting during transportation, shall be removed. They are unnecessary for mounting.
b) Fasten the circuit-breaker on the mounting plate with two attaching screws for the circuit-
breaker. In case of plug-in type, mount the circuit-breaker on the plug-in terminal block.
c) Turn off the circuit-breaker.
d) Mount the electrical operation unit on the circuit-breaker in such a way that the handle of the
circuit-breaker should fit into the handle insertion hole of the handle manipulation member
(plastic molding) on the back of the electrical operation unit. Tighten the circuit-breaker and
the electrical operation unit together into the mounting plate (plug-in terminal block in the
case of plug-in type) using two attaching screws for the electrical operation unit (B).
e) In case of the earth leakage breaker, adjust the indications of sensitivity current and
leak trip action time on the name plate found in the same package to the settings, and
label it at the prescribed position on the surface of the electrical operation unit.
At the time of delivery, the sensibility current and leak trip action time have been set
500mA and 2.0 sec respectively.
Line Handle operation ON OFF Trip
member color red green gray
(plastic molding) Action
Manual handle mount hole
Electrical
Circuit- Fixing screw Manual display
operation Nut for electrical Handle plug- handle MANUAL/AUTO
unit breaker in hole
operation unit changeover knob
Rated current Rated sensitibity
Load MITSUBISHI
Operating time
The circuit breaker's spec
MITSUBISHI
Electrical Circuit-
operation breaker
unit
Mounting plate
Load Load
Attaching screw for
circuit-breaker (A)
100AF-M4×35
225AF-M4×55
60
(iii) Case of flush plate type
a) Detach the four attaching screws for b) Mount the electric operation type circuit-
flash plate to remove this plate. breaker on the panel at the four mount
Indicating hole (ON/OFF/Trip) holes of the flush plate frame.
Flush plate
Attaching hole for manual handle
Manual handle
MANUAL/AUTO Flush plate
changeover knob frame
Four mount
Four attaching holes
screws Two attaching screws
for flush plate for electric operation
unit cover
ON OFF
OFF
(RESET)
CAUTION
Every time the electrical operation unit is dismantled or remounted, turn off the master circuit-
breaker, switch off the operational circuit to make sure that the main and operational circuits
are not alive (charged). Beware of electric shock. Notice that the manual operation handle
operates at high speed during electric operation. Never try to perform the electric operation
with cover opened. Turn off the power supply for operational circuit at the time of manual
operation.
(i) When the circuit-breaker trips, the resetting (reclosing) procedure depends on the status of the
electric operation unit before the trip:
Trip with unit ON: Resettting (OFF) operation → ON operation
Trip with unit OFF: ON operation → Resetting (OFF) operation → ON operation.
(ii) Never try to apply ON and OFF operation signals continuously. There must be a time interval of
0.5 sec or longer between the ON and OFF signals.
(iii) Since the electric operation unit is of intermittent rating, never try to operate 10 times or more
continuously (ON and OFF consecutive operation is counted as one operation).
(iv) The operational voltage shall be within 85 to 110% of the rated operation voltage.
(v) In case of automatic reset mode, resetting operation shall be made with 0.5 sec of time interval
after the NFB tripped.
(vi) Note that the electrical operation unit will not display the trip when the circuit-breaker trips due
to some trouble (overload, short-circuit, leakage), internal accessories (UVT, SHT) or to the trip
button, test button.
(vii) The electrical operation unit incorporating pumping prevention device, it can be turned off
while the ON switch is maintained thrown, but it cannot be turned ON continuously after that. If
it is to be turned on, once change the ON switch over to OFF, and then apply again the ON
switch.
(viii)In the manual operation mode, make sure to manipulate the manual operation handle up to the
position indicated by the name plate.
(ix) The withstand voltage of the electrical operation circuit is 1500V. If the withstand voltage test is
performed under a voltage exceeding 1500V together with other equipment, cut off the termi-
nals (P1, P2, S2 and S4) of the operational circuit.
(x) Note that the leak sensitivity current and action time changeover device for Earth leakage
circuit breakers have been set 500 mA 2.0 sec (at delivery). If the user wants to change this
setting, proceed to the change only after removing the frame.
62
(b) Mounting
(i) Front-connection/Rear-connection (Other than the U-series).
(i)-1 Sequential order for mounting the electrical operation type MCCB (A)
a) Detach the four cover mount screws (A) to remove the cover. Frame
b) Fix the electric operation type MCCB on the panel using four MCCB Cover Trip
lever
mount screws (B). (B)
c) Connect the electric operation unit to the terminal of operational (C)
circuit. Plane
F
MCCB
d) Fasten the cover with four cover mount screws (A).
(D)
(i)-2 Maintenance and inspection of electrical operation unit (Removal
of this unit only)
a) Detach the four cover mount screws (A) to remove the cover. Trip
button
b) Remove the four frame mount screws (C). Mount panel
c) Slide the electric operation unit slightly toward the power supply Fig. 3
side to remove the frame from hook pin.
❈ When mounting the unit on the MCCB, thread the handle between
the rollers of the bracket beforehand. The electric operation unit
has been so designed that it may be supported temporarily by the
hook pin in case of setting with screws. Cover
❈ Mount the electric operation unit so that the end of the trip lever
(A)
matches with the position of the trip button of MCCB.
❈ The end of the trip lever projects from the plane F of the frame. Frame
Take care not to allow the trip lever to be deformed.
(ii) Flush plate type (Other than the U-series) (C)
Flash
(D) plate
a) Mounting the electric operation type MCCB Plane
F
Fix the MCCB on the panel or the like using the attaching (mount) MCCB
screws (E) for flash plate. (E)
❈ NF1600-SS shall be mounted with the mount angle of MCCB. Spacer
b) Maintenance and inspection of electrical operation unit (Removal
of this unit only) Same as for front connection/rear connection types.
Fig. 4
Note. When mounting 800 AF and subsequents, the smaller slider
out of the two sorts of sliders (insulating plates) between
the bracket and cover shall be incorporated into the upper
plane, and the notched portion of the larger one into the
lower left corner.
(iii) Mounting the front-connection and rear-connection (U-series)
(iii)-1 NF400-SEP (3P)
a) Detach the electrical operation unit from the circuit-breaker.
Step 1 Detach the four cover mount screws (A) to remove the cover. (A)
Step 2 Remove the four frame mount screws (C). Frame
Step 3 Slide the electric operation unit slightly toward the power Cover (C)
Trip
supply side to remove the frame from hook pin to remove lever
G Z2
Earth terminal
Earth terminal
R3 R4 (DC–) P2 X
(DC-) A1 M
Operational Y Z Z
R1 R2 T1 M
Z1 power supply P1
Control X Y
E1
power Y X
supply LS
T1 Z X Z
A2
X X1 Y1 Y
E2 Y T2
Z4a Z4b X
ON T1b ON S1
B T1
R Y2a T2a OFF T2 Y LS
OFF Z3
Reset Reset S4
C
T2
ALa 95
D
AL
M : Motor
X : Relay for ON operation
Y : Relay for OFF operation
Z : Relay for changing motor polarity
T1 : Timer for antipumping
T2 : Timer for automatic reset
LS : Limit switch
AL : Alarm switch for automatic reset (a contact)
64
4 Spring-charged type (2)
• Electrical Operation : When the ON operation switch is closed, the closing coil is excited, latch mechanism
is released and the closing spring will turn on the circuit-breaker instantaneously. If
the OFF operation switch is closed, the relay will come into function to start the motor.
If, under these conditions, the circuit-breaker is turned OFF (reset), the closing spring
will be charged instantaneously.
• Manual Operation: Depressing the ON button will release the latch mechanism, and the closing
spring will turn on the circuit-breaker instantaneously.
OFF (reset) Operation.
When the manual lever is taken out depressing the leaf spring, and the lever is
thrown a dozen times reciprocatedly, the circuit-breaker turns OFF (resetting)
and the closing spring is charged at the same time.
CAUTION
Every time the electrical operation unit is dismantled or remounted, turn off the mas-
ter circuit-breaker, switch off the operational circuit to make sure that the main and
operational circuits are not live (charged). Beware of electric shock.
Case of remote operation (electric operation)
(i) The operational voltage shall be within the range from 85 to 110% of the rated operational
voltage.
(ii) Since the electric operation unit is of intermittent rating, avoid operating it 10 times or more
continuously (ON and OFF consecutive operation is counted as one operation).
(iii) The turning off by the electric operation requires about 2 sec (from application of OFF signal on
the electric operation unit to turning off of the circuit-breaker). If one wants to open urgently the
main circuit by remote operation, it is recommended to use the circuit-breaker with SHT or UVT.
(iv) When the circuit-breaker trips, the resetting (reclosing) procedure depends on the status of the
electric operation unit before the trips:
Trip with unit ON : Resetting (OFF) operation → ON operation
Trip with unit OFF : On operation → Resetting (OFF) operation → ON operation
Case of local (manual) operation
(i) Turning ON
Pressing the ON button will release the latch mechanism
and turn on the circuit-breaker instantaneously by the en-
ergy of the closing spring.
(ii) Turning OFF (reset)
The manual turning OFF (resetting) should be repeated more
than 10 times after taking out the manual lever. Repeat the
operation of manual lever without fail up until the manual
lever idles. After completion of the manual operation, house
the lever into its original position.
Note. Sometimes the operational load reduces more or
less midway with the circuit-breaker turning off emit-
ting a sound. Never fail to continue to operate the
manual lever until it does idling.
(iii) Trip operation
The circuit-breaker with the electric operation unit has been
so designed that it should not trip even if the trip button is
depressed under OFF condition. When the circuit-breaker is to be tripped on occasion, for
instance, of witnessed test, it shall either be made to trip after once it shall be turned ON or
shall trip by turning it on with trip button depressed.
65
(iv) In case when the main circuit is to be opened in emergency:
If the main circuit is to be opened in emergency by manual operation, the
circuit-breaker shall be made to trip depressing the trip button.
Indicator
(i) Pay your full attention to it that the electric operation unit does not indicate
trip even when the circuit-breaker trips. It will indicate as below. Trip indi-
cator may be manufactured upon your request.
(Condition of the circuit-breaker) (Indicate by the electric operation unit)
ON ON
Tripped
OFF OFF
66
(iv) Mount the electric operation unit on the circuit-breaker.
Attaching screws are four M6 screws, The electric op-
eration unit has been so designed that it can be provi-
sionally supported by hook pin when it is to be fastened
with screws.
(v) Wire the electric operation unit to the control circuit.
Mount the terminal cover after the wiring.
(vii) Mount the cover of the electric operation unit after fitting the panel
to be supplied by user.
• Operational Circuit
Such wiring as shown by the broken line will be added for the automatic resetting type.
Internal wiring (breaker OFF state)
CC :Closing coil
LS3 LS2 Y :Pumping prevention relay
Y CC
X :Self holding relay
M X M :Motor
Y
LS1 LS1 :Limit switch linked with a cam
Y
X X LS2 :Limit switch linked with a cam
LS3 :Limit switch linked with OFF lock plate
P2 P1 S2 S4
(DC–) ON OFF Alarm switch
RESET (a contact)
for automatic
reset
Noise Filter
Control Automatic reset type require the additional wiring shown by dotted lines.
power
supply
67
(2) Lock cover (LC)
The lock cover is a plug-in type handle mechanism that can prohibit operation readily without
applying any lock. A “Warning Tag” can be attached to it.
One can safely use this mechanism since it may trip with its handle locked at ON position if any
overcurrent flows.
Inoperable
CAUTION
The wiring work shall be performed with the master circuit-breaker OFF even if the unit is
locked into OFF position. Since an electric shock is to be apprehended, always confirm that
there is no current flowing before proceeding to the wiring.
1 Use the circuit-breaker always with the lock cover fully inserted. (Insert once again if the circuit-
breaker trips.)
2 Never try to trip by the trip button with the circuit-breaker locked into OFF position. Otherwise,
the internal mechanism may be destructed.
68
(3) Handle lock (HLN, HLF or HL-S)
The handle locks is a device that lock ON or OFF the handle of the circuit-breaker. Users can
safely use their lock because the circuit-breaker trips when an overcurrent flows therethrough even
if the handle is locked into ON position. There are two types of locks: HLN and HLF which are used
as mounted on the handle and HL-S which is used as fixed on the cover of the circuit-breaker.
How to use:
Padlock
1 2
Lock cover
(Case of HL)
CAUTION
The wiring work shall be performed with the master circuit-breaker OFF even if the unit is
locked into OFF position. Since an electric shock is to be apprehended, always confirm that
there is no current flowing before proceeding to the wiring.
1 Never try to trip the circuit-breaker by trip button with the circuit-breaker locked into OFF position.
Otherwise, the internal mechanism may be broken.
2 The padlock to be used shall be that which is commercially available with the nominal dimensions as
shown in the table on the right hand.
C B
69
(4) Extension handle
This handle makes easy the opening/closing operation of the circuit-
breaker.
Note 1. The extension handle, if used, shall be firmly fixed into the main handle.
Note 2. The extension handle should be detached from the main
promptly afteruse, because if attached to the main the auxiliary Auxiliary handle
may give the internal mechanism a severe shock to reduce its
service life or will get into the air when the circuit-breaker trips.
(5) External handles
1 F type handle
This handle is intended to manipulate the inboard circuit-breaker from without. It is used
when the body of the circuit-breaker is provided with, for instance, the control center.
(a) Opening/Closing operation
• The handle can turn ON when it is rotated clockwise.
• The handle can turn OFF when it is rotated counterclockwise.
• When the circuit-breaker trips, the handle can be reset if it is rotated
counterclockwise further from OFF position.
• The handle is provided with the door lock mechanism that can open
the door only when switching OFF.
ON operation OFF or resetting operation
ON ON
ED ED
PP PP
I
TR
I
TR
OFF
OFF
ET
T
SE
S
RE
S
E
RE
RE L EA REL EA S
Applicable A
type (Nominal dimensions) B C
OFF
ET S
RE
19
AS
PSS(Note) 35 5
RE L E
Handle
Lock plate
Padlock
• OFF lock
Turn the handle toward the reset position, while lightly drawing out the lock plate, return the
handle in the arrowed direction when the lock plate has been drawn out, then fix the lock
plate in the lock position. Use a commercial padlock through the hole on the lock plate to lock
the handle.
Handle Padlock
Lock plate
70
Attention
(i) Never fail to remove the extension handle when the opening/closing operation is over or
when UVT trip button and/or ELCB test button are
operated or tripped. Otherwise it may give the in- ON ON ON
ternal mechanism a severe shock or reduce its
OFF
OFF
OFF
service life or may get into the air when the circuit-
breaker trips. Handle
(ii) Refrain from using such organic solvent as thinner When ON with When OFF with When OFF with
for cleaning the panel (decorative sheet) or handle. the door closed the door closed the door open
(iii) Handle position with the door open:
While the door is open, the handle position at OFF may shift. This results naturally from
the structural feature of the external handle. It is not anomaly.
(iv) When the door is to be opened with the circuit-breaker ON, open it with the release pin left
turned in the arrowed direction.
(v) It is difficult to manipulate the trip button of the circuit-breaker in case of 2 poles. Some
metallic wire rod in L-shape shall be prepared.
2 S type handle
This handle, intended to manipulate the inboard circuit-breaker OFF/Reset
ON position
from without, shall be used when it is to be provided on the operation
door side. ON ON
PE
D
PE
D
IP
IP
TR
TR
(a) Opening/Closing operation
T OFF
T OFF
• Rotating the handle clockwise will turn the circuit-breaker
SE
SE
RE
RE
RELEASE RELEASE
EN EN
OP OP
ON.
• Rotating the handle counterclockwise will turn the circuit-
breaker OFF.
• When the circuit-breaker trips, it can be reset if the handle
is rotated counterclockwise further than OFF position.
(b) When locking
The external handle can be locked at ON and OFF positions. Raise the locking metal of the
external handle and shut a padlock. If the locking metal cannot be raised, move the external
handle so that the metal should fit into the groove of the decorative sheet. The padlock shall
be supplied by user. Up to 3 padlocks may be attached under normal conditions.
Dimensions of padlock
The padlock to be used shall be commercially available one. Locking
Applicable A C B metal
type (Nominal dimensions) B C
ON
IP
PSS(Note) 35 19 5
TR
OFF
71
3 V type handle
(a) Assembly
● 125 and 250 A frames ● 400, 630 and 800 A frames
Breaker
Panel X
X thickness
1.2~3.2 Shaft pin Cutting length
1.2~3.2 Shaft pin Cutting length
P
P
(c) Installation
● 125 and 250 A frames ● 400, 630 and 800 A frames
Washer Washer
(2 pcs.) 4 pieces Spacer
90
Shaft pin 90
Tighten the joint where the pin is Joint mtg screw (upper side)
perpendicular to the arrow mark M5x14 (2 pcs.)…2.5~3.5 N·m Joint mtg screw (upper side)
on the bushing. Shaft pin M5✕20 2 pieces…3 N·m
Note. Set the shaft pin at vertical position under OFF state, then mount the joint plate.
72
(f) Caution
Mount the external handle under OFF state.
Be careful that the shaft pin rotate when the breaker is tripped under opening the door.
The door cannot be closed in trip position.
Reset operation under opening the door, rotate the square shaft unticlockwise by spanner or mon-
key wrench.
4 R Type handle
(a) Installation
● 125 and 250 A frames ● 400, 630 and 800 A frames
External handle mtg screw
Breaker mtg screw
M5✕68 4 pieces…2.5~3.5 N · m
Final controlling element 400AF……… M6✕60 4 pieces…2.5~4 N · m
lock nut, M4 (2 pcs.) … …
630, 800AF M6✕35 4 pieces 2.5~4 N · m
Breaker mtg screw
125AF, 250AF…M4✕55(73) 2 pieces…1.5N·m
Spacer
Status indicator plate
Breaker
Lock plate
Breaker spec
External handle mtg screw
M4✕62(80) 2 pieces…1.5 N·m Rated current
2 REMOVING
Push the tip of the U-form projection fully toward the “ ” the tip of the
mark by the screw driver or a finger tip and pull out the U-form projection
terminal cover toward the “ ” mark.
3 SEALING
sealing plate
Terminal cover can be sealed with the sealing plate and
wires. seal
Put the sealing plate into the hole of the U-form projec-
tion and seal the terminal cover.
MDU with CC-Link option can transfer measured data to open network CC-Link.
● When a circuit breaker outputs a alarm , LED on MDU turns on.
PAL : pre-alarm
OVER : over current
● When the circuit breaker is tripped, fault cause and fault current stored in EEPROM.
CAUTION
Note1. The module (terminal) is attached to the right side of the breaker.
Pre-alarm(PAL) output function can set [Self-holding] or [Auto reset].
For function of alarm contact output (PAL, OAL), MDU and the circuit breaker must be
connected with the mutuality and the control power must be supplied to MDU and alarm
contact output module.
Note2. If input is over range, in this case, MDU display maximum measuring value.
Note3. Pulse output option and CC-Link option cannot be attached at the same time.
Note4. When control power supplied to MDU, then rushed current transitionally, max. 40Apeak,
1ms (at 240VAC).
74
4.2 Functions and names of each component
There may be functions and items that cannot be operated depending on the type and specification
Numerical Mode Phase Measured value Function Alarm Unit
display selection selection selection selection display display
LED (6digit) LED LED LED LED LED LED
9 10 11 12 13 14 15
MITSUBISHI m A
1 2 3 4 5 6
Mode Phase Measured value Function Alarm reset ENTER
selection selection selection selection switch switch
switch switch switch switch
75
6 ENTER switch
This switch decides value or item that selected at function select mode.
7 UP/DOWN switch
This switch is used by set the value or select the item.
When this switch is active, UP/DOWN active LED is turned on.
8 UP/DOWN active LED
When UP/DOWN switch is active, this LED is turned on.
9 Numerical display LED(6digit)
Electric energy is displayed at 6digits. The other measurement values are displayed at right
3digits.
A Mode selection LED
The LED of selected mode is turned on.
B Phase selection LED
The LED of selected phase is turned on.
C Measured value selection LED
The LED of selected value is turned on.
D Function selection LED
The LED of selected function is turned on.
E Alarm display LED
When an alarm is output from the circuit breaker, the corresponding LED is turned on.
F Unit display LED
The LED of unit of measured value is turn on.
4.4 MDU terminal
(1) Control power terminal : L1, L2
Connect the control power of MDU. There is no polarity.
(2) Earth terminal : FG
Connect the FG terminal of MDU to,
MDU installation is breaker mounting : the PE terminal of holder plate on circuit breaker
MDU installation is panel mounting : the PE terminal of panel plate
PE terminal connect to the ground or PE conductor.
(3) Pulse output terminal : 113, 114(with electric power accumulated pulse output option)
Output terminal of electric energy accumulated pulse output. There is no polarity.
(4) CC-Link transmission terminal : DA, DB, DG, SLD(with CC-Link transmission option)
Connect the CC-Link transmission signals DA, DB, DG and SLD.
MITSUBISHI m A
k V
Measuring % W
Display Wh
Unit
MODE PHASE VALUE FUNCTION ALARM
A HARMONICS I 1 V 1-2 PRESENT DEMAND TIME PAL
CLEAR OVER
V TRIP I 2 V 2-3 MAX. Direction of
W I 3 V 3-1 DEMAND
KWh/imp
flat cable connection
Wh PF ALARM HOLD
ALARM RESET
ENTER
9 0 1
8 2
7 3
L ERR.
L RUN
SD
RD
84218421 6 5 4 RESET
× 10 × 1
STATION NO.
MDU Terminal
L1 L2 1 2 3 4 5
MDU control power
MDU terminal (MDU breaker mounting)
Fig. Outline of MDU breaker mounting 1 2 3 4 5
No transmission — FG — — —
Pulse output — FG — 113 114
CC-Link FG SLD DG DB DA
76
MDU control power
PE 1 2 3 4 L2 L1
Direction of
flat cable connection
Terminal
Direction of
flat cable connection
PE Terminal
77
4.5 CC-Link transmission
(1) Station number setting switch
Open the MDU terminal cover, set the station number by BCD code.
(Setting range : 1-64, default setting : 1) ON ON ON
Sample setting : ON
Station number
X10 ··· 2X10=20 setting switch
X1 ··· 8X1+1X1=9
a total is, 20+9=29 8 4 2 1 8 4 2 1
station number = 29 ×10 ×1
Station number sets no overlap on the same line.
As for the number of connection and matching of the other device, see 4.5.
(2) Transmission baud rate setting switch
Set the transmission speed.
Number Descriptions 9 0 1
0 156kbps (default setting) 8 2
1 625kbps 7 3
2 2.5Mbps 6 5 4
3 5Mbps
4 10Mbps Transmission baud rate
5~9 Unusable (L ERR. LED turn on) setting switch
MITSUBISHI m A
k V
Measuring % W
Display Wh
Unit
MODE PHASE VALUE FUNCTION ALARM
A HARMONICS I 1 V 1-2 PRESENT DEMAND TIME PAL
CLEAR OVER
V TRIP I 2 V 2-3 MAX.
W I 3 V 3-1 DEMAND
KWh/imp
Wh PF ALARM HOLD
ALARM RESET
ENTER
9 0 1
8 2
7 3
L ERR.
L RUN
SD
RD
84218421 6 5 4 RESET
× 10 × 1
STATION NO.
Condition 1. {(1Xa)+(2Xb)+(3Xc)+(4Xd)}q64
a : Number of modules occupying 1 station (MDU is applied.)
b : Number of modules occupying 2 stations
c : Number of modules occupying 3 stations
d : Number of modules occupying 4 stations
When MDU is panel mounting, the shielded twisted pair cable which connect terminal on MDU
mounting panel and terminal on MDU.
(1) The distance of one side connection (=15cm) is included in the distance of adjacent station.
(2) The distance of each sides connection (=30cm) is included in the maximum transmission distance.
(3) Use the shielded twisted pair cable which is the same as these connections (the model is FANC-SB).
If the different cable is used, change the cable of these connections.
79
4.7 Connection of terminal resistor (With CC-Link option)
Always connect terminal resistor supplied with the master module to the modules at both ends and
between DA and DB.
Terminal DA DA DA Terminal
Resistor DB DB DB Resistor
DG DG DG
Terminal resistor shall be connected between DA and DB when MDU is end of line.
At this case,
MDU breaker mounting : Process terminal resistor which is supplied by the master module, in
accordance with “modification”.
MDU panel mounting : Not need processing.
[Modification]
(1) Cut the both leads of terminal resistor with 15mm remained.
terminal resistor
(supplied with the master module)
insulation tube
Terminal
Cut Cut
15mm 15mm
CAUTION
The terminal resistor value is different depends on the connected CC-Link shielded twisted pair cable.
Check the resistor value when it will be connected on the terminal DA-DB.
When wrong resistor is connected, CC-Link communication may not work correctly.
Please read the instruction manual included with the same package as master module, about resistor
value.
80
4.8 External connection diagram
Line side Line side
Measurement phase number 1 2 3 N (Neutral) Measurement phase number 1 2 3 N (Neutral)
Terminal number 1 3 5 7 Circuit breaker Terminal number 1 3 5 7 Circuit breaker
CT VT CT VT
No used 114
No used 113
No used No used
L2 L2
L1 L1
Line side
Measurement phase number 1 2 3 N (Neutral)
Terminal number 1 3 5 7 Circuit breaker
Line side
Measurement phase number 1 2 3 N (Neutral) Alarm Fault cause
DA
CT VT
DB
DG
PE(on holder plate)
SLD
DA
DA
DB
DB
DG
DG
MDU MDU
SLD SLD
FG FG
L2 L2
L1 L1
81
4.9 Detailed specifications of MDU
(1) Measurement, display and transmission items.
No Electric energy CC-Link
Function
trans- accumulated transmission Remarks
mission pulse output
MDU
display
storage pulse storage storage
Measuring items (accuracy)(note3.) (note1.) output (note1.) monitor setting (note1.)
(note2.)
Present value (I1, I2, I3, IN) R.M.S. value of 4cycles samplings. (note4.)
Load Demand time : 0-15min. adjustable.
Demand value (I1, I2, I3, IN)
current (present value if set to 0 minute)
(±2.5%) Maximum demand value (max. phase) (note5.)
} Maximum demand value after latest reset.
Occurrence time of demand max. value (y·m·d·h·m)
Present value (V1-2,V2-3,V3-1) R.M.S. value of 4cycles samplings. (note4.)
Line Demand time : 0-15min. adjustable.
Demand value (V1-2,V2-3,V3-1)
voltage (the value is present value, if set to 0 minute)
(±2.5%) Maximum demand value (max. phase) (note5.)
} Maximum demand value after latest reset.
Occurrence time of demand max. value (y·m·d·h·m)
Present value of 3rd,5th and 7th harmonic (I1, I2, I3, IN) R.M.S. value of 4cycles samplings. (note4.)
Maximum value of 3rd,5th and 7th harmonic (max. phase) (note5.)
} Maximum value after latest reset.(not demand value)
Occurrence time of max value (y·m·d·h·m)
Harmonics
Present value of total harmonics (I1, I2, I3, IN) R.M.S. value of 4cycles samplings. (note4.)
current
(±2.5%) Demand value of total harmonics (I1, I2, I3, IN) Demand time : 0-15min. adjustable.
(present value if set to 0 minute)
Maximum demand value (max. phase)(note5.)
} Maximum demand value after latest reset.
Occurrence time of demand max. value (y·m·d·h·m)
Present value (reverse electric power can be measured) R.M.S. value of 4cycles samplings. (note4.)
Electric Demand time : 0-15min. adjustable.
Demand value (reverse electric power can be measured)
power (present value if set to 0 minute)
(±2.5%) Maximum demand value (note6.)
} Maximum demand value after latest reset.
Occurrence time of demand max. value (y·m·d·h·m)
Accumulated value after the latest
Electric energy (note6.)(note7.)
Electric 6digit 6digit 6digit 6digit 6digit reset
energy Electric energy (hourly value) (note6.) Hourly accumulated value
(±2.5%) Maximum electric energy (hourly value) (note6.)
} Maximum value after latest reset.
Occurrence time of max. value (y·m·d·h·m)
Fault current Fault current (±15%) Newest fault current and cause after the latest reset.
Fault cause Fault cause (Occurrence is monitored at 1ms cycle.)
Power factor
Present value R.M.S. value of 4cycles samplings. (note4.)
(±5%)
Fault cause reset
Memory Memory clear of Maximum demand value and
clear Occurrence time of max. value (y·m·d·h·m)
Reset Memory clear of electric energy
Alarm reset
CAUTION
Note1.Data storage to EEPROM takes place as below :
Electric energy : at the power failure and every 2 hours
Fault current/cause : at the fault occurrence
Demand time, pulse output unit and alarm hold : at the setup
Maximum demand value and maximum harmonic current : at every 2 hours
Note2.Pulse is outputted, when electric energy accumulated setup unit. Adjustable at 1kWh, 10kWh, 100kWh, 1000kWh or 10000kWh.
Pulse output is able to count by PLC, etc.
Note3.The accuracy of load current and line voltage is percentage toward the measuring ratings.
Ex.NF400-SEPM,
rating measuring load current is 400A, the accuracy is ±10A,
rating measuring line voltage is 440V, the accuracy is ±11V.
When measurement value of load current or line voltage is less than and including accuracy, the value is cut off and MDU displays “0”.
The accuracy of power factor is rate to 90° (electrical angle).
The value of power factor is reference value if less than 50%.
Note4.Sampling for measurement takes place once every 2 seconds in 4 cycles of 50/60Hz, and the measured values are used to calculation of the present values, and the
values are updated.
A demand value is obtained by averaging out the present values measured at 2 seconds cycle at the preset demand time.
For machines, which undergo interrupted continuous load, such as resistance welder, special care should be exercised for these values.
Note5.A max. phase means the phase measured maximum value among all phases.
Note6.Reverse electric power or energy is not measured.
Note7.Data of electric energy is 6 digits (up to 999999kWh), and others are 3 digits.
Note8.LEDs on MDU are displayed,
Alarm hold setting is [Auto reset] : automatic reset,
Alarm hold setting is [Self-holding] : self-holding, alarm is reset by pushing alarm reset switch. 82
Note9.Demand time cannot be set independently. It becomes common setup.
(2) Measured value display and the range displayed
Item Type Rated current Range displayed Display
0~800A 0~800A is displayed (less than 10A, "0A" is displayed)
NF400-SEPM/HEPM 200~400A
800A over 800A is displayed
0~999A 0~999A is displayed (less than 15.7A, "0A" is displayed)
NF630-SEPM/HEPM 300~630A 1000A~1260A 1.00~1.26kA is displayed
Load current
1260A over 1.26kA is displayed
0~999A 0~999A is displayed (less than 20A, "0A" is displayed)
NF800-SEPM/HEPM 400~800A 1000A~1600A 1.00~1.60kA is displayed
1600A over 1.60kA is displayed
NF400-SEPM/HEPM
0~690V 0~690V is displayed (less than 10V, "0V" is displayed)
Line voltage NF630-SEPM/HEPM Common
690V over 690V is displayed
NF800-SEPM/HEPM
0~400A 0~400A is displayed (less than 10A, "0A" is displayed)
NF400-SEPM/HEPM 200~400A
400A over 400A is displayed
0~630A 0~630A is displayed (less than 15.7A, "0A" is displayed)
Harmonic current NF630-SEPM/HEPM 300~630A
630A over 630A is displayed
0~800A 0~800A is displayed (less than 20A, "0A" is displayed)
NF800-SEPM/HEPM 400~800A
800A over 800A is displayed
–478kW over –478kW is displayed
–478~–100kW –478~–100kW is displayed
–99.9~0kW –99.9~0kW is displayed (less than –0.5kW, "0kW" is displayed)
NF400-SEPM/HEPM 200~400A
0~99.9kW 0~99.9kW is displayed (less than 0.5kW, "0kW" is displayed)
100~478kW 100~478kW is displayed
478kW over 478kW is displayed
–753kW over –753kW is displayed
–753~–100kW –753~–100kW is displayed
–99.9~0kW –99.9~0kW is displayed (less than –0.8kW, "0kW" is displayed)
Electric power NF630-SEPM/HEPM 300~630A
0~99.9kW 0~99.9kW is displayed (less than 0.8kW, "0kW" is displayed)
100~753kW 100~753kW is displayed
753kW over 753kW is displayed
–956kW over –956kW is displayed
–956~–100kW –956~–100kW is displayed
–99.9~0kW –99.9~0kW is displayed (less than –1.0kW, "0kW" is displayed)
NF800-SEPM/HEPM 400~800A
0~99.9kW 0~99.9kW is displayed (less than 1.0kW, "0kW" is displayed)
100~956kW 100~956kW is displayed
956kW over 956kW is displayed
0~999999kWh
Electric energy Common Common 0~999999kWh (When 999999kWh over, then return to 0kWh and
continuously accumulated)
NF400-SEPM/HEPM 200~400A 0~478kWh 0~478kWh is displayed
Electric energy
NF630-SEPM/HEPM 300~630A 0~717kWh 0~717kWh is displayed
(hourly value)
NF800-SEPM/HEPM 400~800A 0~956kWh 0~956kWh is displayed
0~999A 0~999A is displayed
NF400-SEPM/HEPM 200~400A 1000A~6400A 1.00~6.4kA is displayed
6400A over 6.4kA is displayed
0~999A 0~999A is displayed
NF630-SEPM/HEPM 300~630A 1000A~9600A 1.00~9.6kA is displayed
Fault current
9600A over 9.6kA is displayed
0~999A 0~999A is displayed
1000A~9990A 1.00~9.99kA is displayed
NF800-SEPM/HEPM 400~800A
10000A~12800A 10.0~12.8kA is displayed
12800A over 12.8kA is displayed
Power factor Common Common lag 0~100~lead 0% 0~100~0% (lead is displayed "–"(minus))
83
(3) Note of measurement
1 Load current measuring
The accuracy of load current measuring is ±2.5% of Measurement
measuring rated current. value
2 Demand value
Demand value is approx. mean value of demand I
time. 0.95I
Demand time (t0) is the time which show 95% of I,
while the current I is carried continuously.
When the demand value shows (I), three times of
Measurement
(t0) constant current flow is required. value
When the demand value is measured, the mea- (I0)
sured value is not influenced by short time load
fluctuation or blinking.
t0 Time(t)
It shows approx. mean value by demand time. (Demand time)
–99.7% 100%
Accuracy
99.7%
Accuracy
56.6%
–50% 50%
43.1%
±50% of 90°
±4.5° ±4.5°
84
4.10 Operation of MDU
Displayed items and functions are changed by pushing 1~4 switch.
Selected item is shown by LED (below A - D).
(Ex. Phase selection I1→I2→I3→IN→I1...)
UP/DOWN switch7 is active when adjustment or reset operation is required.
(UP/DOWN active LED8 is turned on)
There may be functions which cannot be operated depending upon the specifications.
The invalid function is skipped.
9 10 11 12 13 14 15
MITSUBISHI m A
1 2 3 4 5 6
Mode Phase Measured value Function Alarm reset ENTER
selection selection selection selection switch switch
switch switch switch switch
85
(5) Harmonic current
• Push 1(Mode selection switch). Select the [HARMONICS] LED.
• Push 7(UP/DOWN switch). Select the order of the harmonic. Left 2digits
Harmonic
Right 3digits
Harmonic
order current
(Harmonic order is displayed numerical display at LED9
of left 2 digit. See the right figure.) Total harmonics
When the circuit breaker was tripped, fault current and cause are displayed at numerical display
LED9 with flashing.
Push one of the 1 - 8 switches, the display mode is returned before tripping.
(7) Power factor
• Push 1(Mode selection switch). Select the [PF] LED.
When the circuit breaker outputted over current alarm(OVER), [OVER] LED at E(Alarm display
LED) is turned on.
[OVER] LED is automatic reset in any setup of "ALARM HOLD".
Function of alarm is shown this table.
Alarm Function
When the circuit breaker outputted pre-alarm, [PAL] LED on the MDU is turned on.
Pre alarm (PAL)
And alarm contact is outputted if equipped with PAL or TI option.
Over current alarm (OVER) When the circuit breaker outputted OVER, [OVER] LED on the MDU is turned on.
86
4.13 Operation of function mode selection
(1) Demand time
• Push 4(Function selection switch).
Select [DEMAND TIME] LED. Right 2digit
• Push 7(UP/DOWN switch). Demand time
Set the demand time.
(Adjustable at 1-minute step.
Range is between 0 - 15 minutes) Ex. Display of numerical display LED
at demand time is 15min
• Push 6(ENTER switch) to be set.
(2) Memory clear
• Push 4(Function selection switch). Select [CLEAR] LED.
• Push 7(UP/DOWN switch). Select the data to clear.
The data is shifted in the shown turn.
If the date is [ALL], it means all of data in storage (except for electric energy), then display [ALL]
at 9(Numerical display LED) with flashing.
In the case of others, the same LED of measurement and display mode with flashing.
ALL (except for electric energy)
3rd harmonic current of maximum value Ex. Display of numerical display LED
at data is ALL
5th harmonic current of maximum value
100kWh/imp
1000kWh/imp
Ex. Display of numerical display LED
10000kWh/imp at unit is 10000kWh/imp
{
year month date
• After date setting, push 6(ENTER switch). Shift the time setup mode.
Current adjust
Voitage adjust
Clear of adjustment
88
[ Note of function mode selection with switch operation ]
Function mode selection with switch operation makes setup or clear possible (function is shown
below).
Select the function by pushing the function mode selection switch, select the value by pushing UP/
DOWN switch and pushing ENTER switch.
The data of EEPROM is rewritten or cleared.
Function Description
Variable at 1-minute step between 0-15 minutes.
DEMAND TIME Demand time cannot be set independently but set in common.
Present value if set to 0 minute.
Clears the stored data of electric energy, maximum demand value, fault current/cause, etc, or
CLEAR
resets OAL contact output.
kWh/imp(note.) Selects the unit of electric energy accumulated pulse output, 1, 10, 100, 1000, 10000kWh/imp.
Selects the function of alarm LED (PAL) and contact output (PAL), self-holding or auto reset.
ALARM HOLD
(OVER LED is auto reset at any preset of alarm hold.)
Note. Pulse output unit is attached with electric energy accumulated pulse output option.
<Example.2>
DEMAND Wait Electric energy Wait DEMAND Wait Fault current/cause
TIME 3s. (clear) 3s. TIME 3s. (clear)
<Example.3>
ALL Wait Max. demand value Wait Electric energy Wait Max. demand value
(CLEAR) 3s. of current (clear) 3s. (clear) 3s. of voltage (clear)
<Example.2>
Send DEMAND TIME Send Send DEMAND TIME Send Electric energy
setting value and Wait Fault current/cause clear Wait setting value and Wait clear command and
receive command 3s. command and receive command 3s. receive command 3s. receive command
completion replay flag completion replay flag completion replay flag completion replay flag
<Example.3>
Send ALL(clear) Send Max. demand value of Send Electric energy Send Max. demand value of
command and Wait load current clear command Wait clear command and Wait load current clear command
receive command 3s. and receive command 3s. receive command 3s. and receive command
completion replay flag completion replay flag completion replay flag completion replay flag
89
4.15 MDU operation modes and displays
Following measured values is displayed according to the operation mode.
Numerical Mode Phase Measured value Function Alarm Unit
display selection selection selection selection display display
LED (6digit) LED LED LED LED LED LED
MITSUBISHI m A
k V
Measuring % W
Display Wh
Unit
MODE PHASE VALUE FUNCTION ALARM
A HARMONICS I 1 V 1-2 PRESENT DEMAND TIME PAL
CLEAR OVER
V TRIP I 2 V 2-3 MAX.
W I 3 V 3-1 DEMAND
KWh/imp
Wh PF ALARM HOLD
ALARM RESET
ENTER
90
4.16 Normal service condition
CAUTION
• Our circuit breakers of the standard specifications are to be used in the following standard conditions.
1Operating ambient temperature : -10 to 40ºC
(Average temperature for 24 hours, however, shall not be higher than 35ºC.)
2Relative humidity : 85% max. with no dewing
3Altitude: 2,000 m maximum
4Environment conditions : Do not use and store in atmospheres with sulfide gas, ammonia gas etc.
(H2Sq0.01ppm.SO2q0.1ppm.NH3q a few ppm.)
• Lowering ratio of operational current in special ambient temperature over 40ºC.
50ºC.........0.9 times
60ºC.........0.7 times
• Never use thinner, detergent, and other chemicals for cleaning.
It is likely to make letters on the plate illegible or to lower insulation performance.
Clean the breaker using air cleaner or by brushing.
CAUTION
• VT is connected between the poles on the load side of the circuit breaker.
1Measurement of insulation resistance
A 1000 volt insulation resistance tester cannot be used with a marks in the table as below.
A 500 volt insulation resistance tester shall be used, but measured resistance shows low resistance.
2Withstand voltage test
Voltage shall not be applied at the portions with X marks in the table as below.
Measurement of
Measuring point/test Withstand voltage test
Insulation resistance
State of handle ON OFF ON OFF Test condition
Between live part and earth (except MDU terminal)
Between left and middle poles
Between middle and right poles AC2500V 1min
Line side
these tests,
Between left and right poles In the case of
Between
Do not connect
Between middle and neutral poles
different
poles
Between left and middle poles
MDU terminal
Load side
Between middle and right poles
Between left and right poles
erath
to live part or
Between middle and neutral poles
Between line and load terminal
Between main circuit and MDU terminal (L1, L2)
Between main circuit and MDU terminal (113, 114, FG)
AC2500V 1min
(With electric energy accumulated pulse output option)
(Note1.)
Between main circuit and MDU terminal (DA, DB, DG, SLD, FG)
(With CC-Link option)
Between MDU terminal (L1, L2) and MDU terminal (FG)
Between MDU terminal (L1, L2) and MDU terminal (113, 114, FG)
AC1500V 1min
(With electric energy accumulated pulse output option)
(Note2.)
Between MDU terminal (L1, L2) and MDU terminal (DA, DB, DG, SLD, FG)
(With CC-Link option)(Note3.)
Note1. Connect MDU terminal (L1, L2, 113, 114, DA, DB, DG, SLD and FG) to the earth side.
Note2. Connect MDU terminal (113, 114, DA, DB, DG, SLD and FG) to the earth side.
Note3. Do not test between MDU terminal (DA, DB, DG and SLD) and MDU terminal (FG).
91
4.18 Connections and installation
CAUTION
• Do not connect in reverse.
• The circuit breaker and MDU were adjusted at the pair. Use the pair of same serial number.
Serial number seal
MDU
Circuit breaker
If the pair of different serial number was used, the accuracy is not guaranteed.
Do not pull the cable which connects MDU and the circuit breaker over 15N. The cable may come off.
• When the trouble occurred, repair is performed pairing MDU and the circuit breaker.
• The cable which connects MDU and the circuit breaker, shall be kept the distance longer than 10cm from the heavy current
circuit. Fix the cable tightly near the connector to avoid the stress to the connector.
• The connector from the circuit breaker is insulated from inside of the circuit breaker.
The breaker usually works even if the cable is not connected with MDU.
But connect the cable early and correctly, because it may become cause of missing measuring.
• Supply the control power to L1 and L2 of MDU terminal. Fuses or MCCB shall be installed in control power circuit.
Do not supply the control power of MDU from the main circuit.
• For function of alarm LED (PAL, OVER) on MDU and contact output (PAL, OAL), MDU and the circuit breaker must be
connected with the mutuality and the control power must be supplied to MDU and alarm contact output module.
• When MDU is used in 1 phase 2 wire, the connection is shown in figure 1.
The load side of phase No.1 is live part. It needs insulation processing.
Use the measurement data of I2, I3 and V2-3. Ignore the measurement data of I1, V1-3 and V3-1.
• When MDU is used in 1 phase 3 wire, the connection is shown in figure 2.
The neutral wire connects to phase No.2 of MDU.
If connect the neutral wire to phase No.1 or phase No.3 of MDU, then the measurement is not guaranteed.
1 2 3 1 2 3
Phase number Phase number
200V
of MDU of MDU
Neutral
100V 100V
Line side
Line side
1 3 5
1 3 5
2 4 6
2 4 6
Load side Load side
Load
Live part
Fig1. Connection of using in 1 phase 2wire. Fig2. Connection of using in 1 phase 3wire.
CAUTION
• The size of wiring MDU is sown as below. Single core Twisted core
In case of single connection 0.45-1.2mm2 0.14-1.5mm2
In case of double connection 0.45-0.8mm2 0.14-75mm2
• Tighten the terminal screws with following tightening torque.
Tightening torque 0.5 - 0.6 N·m
Tool minus head screw driver Bit size Thickness 0.6mm Width 3.5mm
Wire strip length 6mm
• The finish of the wire
In case of single core wire, it can be connected directly to the terminals.
In case of twisted core wire, strip the insulation and twist copper wires. Then it can be connected directly to the terminals. Takes
care the short circuit by wiring. The solder plating is not allowed.
Following compression pin terminal is recommended.
Manufacturer : Phenix contact Metal pin
Pin terminal
Cross section of wiring 0.25mm2:AI 0.25-6 YE (Catalog NO. 3200179)
Cross section of wiring 0.5mm2:AI 0.5-6 WH(Catalog NO.3200687)
Terminal for 2 wires 0.5mm2 × 2:AI-TWIN 2 × 0.5-8 WH(Catalog NO.3200933)
Please contact to the manufacturer as for further details. Cut
However the length of pin terminal (compression) is 6mm
longer than 6mm, cut the metal pin as follows.
92
[ Note of MDU with electric energy accumulated pulse output option ]
CAUTION
• Output line shall be kept the distance longer than 10cm from the heavy current circuit.
And maximum wiring distance is less than and including 100m.
• In the case of pulse output connects to the AC, please pay attention to malfunction of receiver by leakage
current by earth capacitance or mutual capacitance between wires.
CAUTION
• Make sure to connect DA, DB, DG and SLD terminals on MDU to CC-Link line with shielded twisted pair
cable.
When the lived wires are connected to CC-Link terminals, by mistake, it may occur electric shock or fire.
Because CC-Link terminals use only low voltage signals.
• The shielded twisted pair cable of CC-Link line shall be kept the distance longer than 10cm from the
heavy current circuit.
However, it shall be kept the distance longer than 30cm from the heavy current circuit when parallel
installation with the heavy current circuit is required.
For further details, please read “MELSEC CPU user’s manual” regarding to the wire and
cable connection method to PLC.
93
4.20 Installation of the circuit breaker
Setting method of the operating characteristics
CAUTION
Always make sure the circuit breaker is off or tripped when setting the operating characteristics.
Neutral pole
(Only 4pole)
OVER LED(red)
PAL LED(yellow)
Trip button
(PT T) 70%LED(green)
For setting, turn (1) Take off the sealing label, if sticked.
the arrow of each (2) Loosen the test cover’s screw and
dial to the position open the test cover.
desired
(3) Set operating characteristics by
turning the dials.
For turning the dials for chracteristic
setting, use a screwdriver as illus-
trated at left.
1 A slotted head screwdriver of
4.5mm width and 0.6mm thick-
ness at the top is suitable for the
setting.
Current 2 At setting, refrain from applying
setting Ir force more than necessary as
such can cause failues.
STD time Ts Pre-alarm pick up (Adequate operation torque is
LTD time TL
STD pick up current IP 0.05N·m maximum.)
Note 1)
current Is Instantaneous pick up
current Ii 3 Except for the dials of current
setting Ir and instantaneous pick
Step setting type:
LTD time TL, up current Ii keep the arrow of
STD pick up current IS, the setting dials within the range
STD time Ts, of the thick line of setting value.
Pre-alarm pick up current IP
Continuously adjustable type: * As for Is setting, a set value may
Current setting Ir, advance to the next one in some
Instantaneous pick up current Ii cases
Note1) If the LTD time TL is set on "12sec", (4) The blank labels may be used for
the LTD time may be shorter than the STD time. indication of the current setting Ir.
Please fill in the blank label with oily
Fastening torque ink, and stick the label to the top of
0.3~0.6N·m the handle.
(5) Close the test cover and tighten the
screw.
(6) Stick the sealing label, if it is nec-
essary.
94
4.21 Testing of over current relay method
CAUTION
• For function of alarm LED (PAL, OVER) on MDU and contact output (PAL, OAL), MDU and the circuit
breaker must be connected with the mutuality and the control power must be supplied to MDU and alarm
contact output module.
• Can not test MDU by "Y-250". In this case, MDU displays "0A".
But alarm LEDs of pre-alarm (PAL) and over current (OVER) on MDU are turned on.
When the circuit breaker is tripped by "Y-250". In this case, MDU displays fault cause, but fault current is
"0A".
Use the optional breaker tester “Y-250” or else carry out the test with load current.
If the breaker tester “Y-250” is used, execute the test according to its manual.
Here the testing method is explained assuming with load current.
(1) Apply AC current to the circuit-breaker from three-phase or single-phase power supply. In case
of single-phase power supply, apply the current with any two poles in series.
(2) The respective LEDs on the front face of the circuit-breaker, if on, allow to confirm the respective
operational currents.
70% LED(green) : Good if continuous lighting commences within a range 60 to 80% of the
current setting Ir.
PAL LED(yellow) : If Ip is set 0.7xIr, good if flashing every 0.5sec start within the range 60 to
80% of the current setting Ir.
OVER LED(red) : Good if continuous lighting commences within a range over 105% up to 125%
of the current setting Ir.
(3) LTD and pre-alarm operating time can be checked by applying a current equivalent to 200% of
the current setting Ir. If any current exceeding the current setting Ir is applied before this test, the
operating time reduces.
Therefore the first measurement will be invalid in that case. When the circuit-breaker trips, the
trip circuit is reset, and the next operating time can be measured under normal conditions.
70%LED(green)
Start lighting
PAL LED(yellow)
Pre-alarm operating time continuously
Trip
OVER LED(red)
LTD Time
The result is good if the operating time measured falls within the following range.
Setting of LTD time TL TL=12sec TL=60sec TL=100sec TL=150sec
Pre-alarm operation time 4.8~7.2sec 24~36sec 40~60sec 60~90sec
LTD operating time 9.6~16.4sec 48~72sec 80~120sec 120~180sec
95
4.22 Installation of alarm contact output module (option)
(1) Combination of alarm output
NF400-SEPM, NF400-HEPM
Types NF630-SEPM, NF630-HEPM
NF800-SEPM, NF800-HEPM
Function name
PAL OAL
Option name
PAL
TI
Name of each component Control power
L1
L2
Contact output
618 (PAL a)
617 (PAL c)
918 (OAL a)
917 (OAL C)
CAUTION
• For function of alarm LED (PAL, OVER) on MDU and contact output (PAL, OAL), MDU and the circuit
breaker must be connected with the mutuality and the control power must be supplied to MDU and alarm
contact output module.
• Make sure to connect the flat cable and the connector of MDU.
96
4.23 Installation of MDU
The circuit breaker and MDU are adjusted in the pair.
Use the pair of same serial number.
If the pair of different serial number was used, the accuracy is
not guaranteed.
MDU breaker mounting type Circuit
MDU and installation parts are included with same package. Breaker
(1) Installation of the breaker.
Mount the breaker by using screw included with same pack-
age.
Be careful to bite of extension cable and connector.
(2) Installation of MDU
Holder plate is installed on the breaker. Flat Cable
1Fit MDU to holder plate. (See Fig 1.)
Be careful to bite of extension cable and connector be-
tween MDU and holder plate.
2Open the MDU terminal cover, under 5N.
Fix MDU to holder plate by using 2 screws. (See Fig 2.)
Connector
Holder plate
Fig 2.
(3) Connection of MDU
1Make sure to connect, the flat cable and the connector of MDU, the flat cable and the con-
nector of extension cable, until [CLICK].
2PE terminal
Connect the PE terminal of holder plate to the ground.
3Control power
Open the MDU terminal cover.
Connect the control power of MDU to L1 and L2 terminal.
4FG terminal
Open the MDU terminal cover. Connect the FG terminal to PE terminal of holder plate.
(See Fig 3 and Table 1.)
5Electric energy accumulated pulse output
Open the MDU terminal cover. Connect the pulse output cable to 113 and 114 terminal.
(See Fig 3 and Table 1.)
6CC-Link transmission
Open the MDU terminal cover. Connect the CC-Link shielded twisted pair cable to DA, DB,
DG, SLD terminal. (See Fig 3 and Table 1.)
If this MDU is end of line, connect the terminal resistor between DA and DB. (Refer to 6.5)
Table 1. MDU terminal
1 2 3 4 5
No transmission — FG — — —
L1 L2
Pulse output — FG — 113 114
CC-Link FG SLD DG DB DA
72
Panel cutout
(1) Installation of the breaker
A
Mount the breaker by using screw included.
(2) Installation of MDU
Keep space greater than value of Fig 1. Keep space greater than
Install MDU to the panel by panel holder plate. value of below figure. (Note.)
B
1Set MDU obliquely and insert to the panel cut-
A
out from the lower part. (See Fig 2.) Frame B
2Push MDU into the direction of an arrow. (See SEPM HEPM
Fig 3.) 400 237 367 198
In this case, open the hook of the connector, 630
246 376 214
not to touch the panel cutout. 800
3Insert the stopper of panel holder plate to the Panel thickness 1-3.2mm
ditch of holder plate.
(Two places of right and left. See Fig 4.) Note. In the case of Front-connected,
4Fix MDU by using nut and panel holder plate keep space between MDU and
from back side of panel. (See Fig 5 and Fig 6.) conductor or insulation barrier too.
Panel
Ditch Holder plate
to the connector. L2 L1
2Make sure to connect the cable and the connector, until
[CLICK]. PE
3PE terminal Terminal
Connect the PE terminal of panel plate to the ground.
Panel
4Control power plate Terminal cover
Slide the terminal cover. Fig7. (No transmission, Pulse output)
Connect the control power of MDU to L1 and L2 terminal.
5Electric energy accumulated pulse output terminal M3 screw
Tightening torque 0.57 - 0.93 N·m
Slide the terminal cover. L2 L1
Fig9. Fig10.
98
4.25 Note of MDU with CC-Link option
(1) If occurred watchdog timer error on MDU, but link special register of master module (SW0084-
SW0087) is not "1" (ON).
(2) If MDU control power supply is failed over 5-10ms, then cutoff CC-Link I/F.
When return from power failure then statuses are,
Initial data processing request flag (RX(n+1)8) is "1" (ON).
Remote READY (RX(n+1)B) is "0" (OFF).
Indicate flag of alarm (RXn2 - RXn7) is holding before power failure.
Remote register (RWrn - RWrn+3) is "00H".
(3) For the details of programming, refer to [MDU Breaker Programming Manual (CC-Link)].
Note. In case of setup of alarm hold is [Self-holding], if status flag is "1" (ON), it is holding until alarm
reset.
In case of setup of alarm hold is [Auto reset], status flag is automatically reset after alarm
signal from the breaker stopping.
Note. Alarm and input bit (RXn2, RXn6 and RXn7) can not be change while error status flag (RX(n+1)A)
is "1" (ON).
Immediate removing from the failure cause is recommended.
Note. Do not read/write to unusable remote registers. If read/write is performed, the functions of the
MDU are not guaranteed.
99
4.28 Error codes
When an error occurs on MDU,
(1) "Er" is displayed in left 2 digits of numerical LED and error code is displayed in right 3 digits of
numerical LED.
("L ERR" LED is turn on with CC-Link option)
(2) When MDU with CC-Link option, then reply error code.
Error details and corrective action for each trouble occurrence are shown below.
[ Error codes ]
Error code (hex) Error details Corrective action
01H Undefined command Modify it to the correct command.
Reset the power supply of the MDU.
Electric energy data is not cleared by this operation.
C0H Hardware error In the case of MDU with CC-Link option, the other method is to push RESET switch.
But a part of electric energy data may be cleared by this method.
Therefore record the electric energy data before pushing RESET switch.
C1H Out of channel range Modify it to the correct channel.
C2H Out of setting range Modify it to the correct setting.
Note. Please read each module instruction manual when other errors, except for above mentioned
table, occur.
Note. Once error status flag (RX(n+1)A) is "1" (ON), the flag can not be reset by PLC reset.
Error reset request flag shall be "1" (ON) to reset error status flag (RY(n+1)A).
Refer to the error code, the error cause shall be removed before resetting.
Note. Alarm and input bit (RXn2,RXn6 and RXn7) can not be change while error status flag (RX(n+1)A)
is "1" (ON).
Immediate removing from the failure cause is recommended.
4.29 Troubleshooting
When the trouble occurs on MDU, please check the following.
(1) Is the cable connected correctly?
(2) Are you using the pair of same serial number?
(3) When the measured current is less than 2.5% of rated current, MDU cuts off and displays "0A".
(4) When the current meter (clamp on type) was used and it does not correspond to harmonics.
It may differ from the measurement value of MDU.
100
5. Maintenance and inspection
CAUTION
● Any maintenance/inspection shall be performed by the personnel having expertise concerned.
Note that there exists the risk of electrical shock.
● Any maintenance/inspection shall be performed after cutting off the master circuit-breaker
(1) If maintenance and/or inspection should be carried out without cutting off the power supply
in an unavoidable cases, wear rubber gloves and insulated boots laying rubber mat on the
floor. Use insulated tools and instruments only. An access to the live parts is necessary in
this maintenance and inspection work, when workers’ full attention should be paid to the
insulation of human body from the live parts.
Any normal opening/closing may be done safely because the live parts are covered with
insulated moulded case or the like.
(2) In the event of measurement of sensitivity current and operate time of the ELCB mounted
on hot line, de-energize first and then wire before proceeding to the measurement as far as
possible. If, from sheer necessity, the measurement should be made under electrified con-
dition, full care should be taken of the safety.
101
Attention Main circuit Auxiliary or control circuit
Rated Test voltage Rated insulation Test voltage
(1)Voltage of the withstand voltage test insulation (AC effective voltage of (AC effective
The withstand voltage test shall be performed in voltage value) operational circuit value)
Ui ≤ 300V 2000V Uis ≤ 60V 1000V
compliance with the table given on the right.
2 Uis + 1000V
300V < Ui ≤ 600V 2500V 60V < Uis ≤ 600V
Do not exceed the values given in this table. (Min. 1500V)
102
(3) Overcurrent trip test (1) NF125-SGW (RE), NF125-HGW (RE)
NF160-SGW (RE), NF160-HGW (RE)
NF250-SGW (RE), NF250-HGW (RE)
NF400-SEP, NF400-HEP, NF400-REP,
NF400-UEP, NF400-ZEP
NF630-SEP, NF630-HEP, NF630-REP,
NF630-UEP
NF800-SEP, NF800-HEP, NF800-REP,
NF800-UEP
NV100-SEP, NV100-HEP
NV250-SEP, NV250-HEP
NV400-SEP, NV400-HEP, NV400-REP
NV630-SEP, NV630-HEP
NV800-SEP, NV800-HEP
A A
2 The respective LEDs on the front face of the circuit-breaker, if on, allow to confirm the respective
operational currents.
70% LED (Green): Good if continuous lighting commences within a range 60 to 80% of the current
setting Ir.
PAL LED (Yellow): If Ip is set 0.7 x Ir, good if flashing every 0.5 sec starts within the range 60 to 80% of
the current setting Ir.
OVER LED (Red): Good if continuous lighting commences within a range 105 to 125% of the current
setting Ir.
103
3 LTD and pre-alarm operating time can be checked by applying a current equivalent to 200% of
the current setting Ir. If however any current exceeding the current setting Ir is applied before
this test, the operating time reduces. Therefore the first measurement will be invalid in that
case. When the circuit-breaker trips, the trip circuit is reset, and the next operating time can be
measured under normal conditions.
200% of the current setting Ir
The result is good if the operating time measured falls within the following range: (Ampere frame 100~225)
Setting of LTD time TL TL=12sec TL=60sec TL=80sec TL=100sec
Pre-alarm operating time 4.8~7.2sec 24~36sec 32~48sec 40~60sec
LTD operating time 9.6~14.4sec 48~72sec 64~96sec 80~120sec
The result is good if the operating time measured falls within the following range: (Ampere frame 400~800)
Setting of LTD time TL TL=12sec TL=60sec TL=100sec TL=150sec
Pre-alarm operating time 4.8~7.2sec 24~36sec 40~60sec 60~90sec
LTD operating time 9.6~14.4sec 48~72sec 80~120sec 120~180sec
104
5.2 Periodical inspection
The inspection shall be worked out once one
month after the commencement of the use and
Yardstick for inspection periodicity
then periodically in terms of the environmental 1 Clean and dry environment Once every 2 to 3 years
conditions in order that any trouble may be Environment not exposed to severe
2 Once a year
avoided and that the circuit-breaker can be used dust, corrosive gas vapor, salt, etc.
for longest possible time. 3 Other places than 1 and 2 Once every six months
5. Is there ON/OFF operation by handle smooth? Operation should be done smoothly. Normally open or normally closed circuit-breaker can
maintain a smoother operation if it is opened and closed
6. Is there TRIP operation by trip button? The circuit breaker should be able to reset after tripping. periodically.
The circuit-breaker should be able to operate and be
ELCB 7. Test shall be conducted using the test button. Test shall be done about once a month.
closed again for certain.
Large short-circuit current near to the rated Soot and dust seen also on the handle, and To be replaced by new one.
breaking capacity remarkable dirt and grime near the vent.
Molten metal adheres to the vent and its
vicinity.
Severely deformed box of box type circuit-
breaker.
Remark: The leak display button may pop out when the earth leakage breaker trip an accidental current that surpasses the instantaneous
trip current.
In case when the intensity of the accidental current cannot be inferred, remove the MCCB/ELCB and
measure the insulation resistance. If the result does not attain the prescribed value (5MΩ), proceed to
the withstand voltage test.
Though the breaker may be used for the time being if there be prescribed withstand voltage, it shall be
replaced with new one as soon as possible.
If both the insulation resistance and withstand voltage are high enough, the breaker may be recognized
as reusable. For a certain period, however, it shall be checked for any abnormal temperature rise or any
other anomalies.
(1) The measurement of insulation resistance and the withstand voltage test shall be performed ac-
cording to (1) and (2) of 5.1.
(2) For ELCB, the operation shall be confirmed by test button too.
105
5.4 Yardstick service life
The maintenance and inspection shall be brought into practice depending on the environment where
the circuit-breaker is installed. The longevity of the circuit-breaker cannot be decided only in terms of
the year of use. Though the service life requires some diagnosis by some experts, the yardstick of
longevity may be as follows:
Yardstick for service life
Replacement Size of circuit- Number of operating cycles Number of operation by vol-
Degree Environment Example yardstick (year) breaker frame tage tripping, undervoltage
Places with ever clear and Dust-proof and air-condi- About 10 to 20 (A) Electrification No electrification Total tripping devices or trip button
1
dry air tioned electrical room In ≤ 100 1500 8500 10000
Referential Circuit-breakers in distribu- 100 < In ≤ 315 1000 7000 8000
use Indoor where there is no tion boards and boxes in in- 10% of the total opening/
About 7 to 15 315 < In ≤ 630 1000 4000 5000
conditions 2 corrosive gas and little dividual electrical rooms closing frequency
dust without dust-proof and air- 630 < In ≤ 2500 500 2500 3000
conditioning 2500 < In 500 1500 2000
Places with little dust but Geothermal power houses, Remark: Number of operation by the test button of ELCB is 1000 times.
with such gases as salty, sewage treatment plants, About 3 to 7
1
sulfurous acid, hydrogen iron and steel works, paper
Poor sulfide, high moisture and pulp plants, etc.
emvironment Places with severe corro-
sive gases and dust where Chemical plants, quarries,
2 humans cannot be for a mines, etc. About 1 to 3
long time
The opening/closing life has been prescribed by IEC60947-2 as shown in the table above.
Note that the larger the frame of the circuit-breaker is, the more opening/closing life reduces.
Though the user might think these frequencies to be fewer than expected, this is because the circuit-
breaker is basically a protective device that differs from the switch intended for more frequent opening/
closing.
It is recommendable to install an electromagnetic contacter for opening/closing in a case where a
capacitor bank is switched in terms of the change in power factor.
Precaution should be taken in use of the circuit-breaker because the tripping by voltage tripping device,
in particular, reduces the service life.
5.5 Standard tools and measuring instruments
(1) Standard tools
Our circuit-breakers have been designed so that they may be installed and connected with commer-
cially available tools. Users are requested to mount and connect them using most appropriate tools.
Table below gives examples of tools ordinarily used.
Use Name Remarks
Screwdrivers should be used whose diameters are of size suited to the diamet-
ers of the cruciform grooves.
Screw tightening Size of diameter:
For M3, M4 and M5: No. 2
Screwdriver For M6 and M8: No. 3
The socket wrench allows to tighten rather firm. Pay your attention to it that it
Tightening of bolts and nuts may break too small bolts and/or buts or else any other bolts if the tightening
totque is too great.
Socket wrench
106
6. Troubleshooting
6.1 Troubleshooting for circuit-breaker proper (MCCB/ELCB)
Trouble Cause Countermeasure
Foreign matter in switching mechanism Foreign matters to be removed
Closing impossible No resetting To be reset once again
Resetting impossible See below (*) See below
Abnormal operation
Incessant use of voltage trip operation To be replaced with new one, Voltage trip to be replaced by electric operation
Wear due to trip endurance
End of service life To be replaced with new one
Poor reset mechanism Poor adjustment To be returned for repairing
(*) Resetting impossible
Non-excitation of undervoltage coil Carelessness To be excited
Tripping impossible
Resetting time has not elapsed Wait until the bimetal is cooled down
OFF impossible
Breakage and/or fatigue of the Breakage by initial trouble To be returned for repairing
switching spring End of service life To be replaced by new one
Fusion of contact due to excessive interruptive current To be replaced by circuit-breaker with large breaking capacity
Broken handle
type display Tightening forgotten of the changeover screw of rated current Correct retightening of the rated current changeover screw with tightening torque: 3 to 4.5 kg-cm
MCCB LED is on Failure of rated current changeover portion To be returned for repairing
Erroneous action while Exothermic reaction due to repeated starting current Erroneous selection To be replaced by a unit with higher rating
starting Too long a starting time Erroneous selection To be replaced by a unit with higher rating
Too high a starting current Electromagnetic setting to be change or the unit to be replaced by one with higher rating
Too high a starting rush current Electromagnetic setting to be change or the unit to be replaced by one with higher rating
Transient current when changing delta connection to star one. Transient current due to reversible operation Electromagnetic setting to be change or the unit to be replaced by one with higher rating
Instantaneous action
Rush current at the time of instantaneous restart Electromagnetic setting to be change or the unit to be replaced by one with higher rating
during starting
Rare short-circuit of motor Motor to be repaired
Bimetal reset incomplete after instantaneous tripping To be fully restored
Abnormal current running simultaneously with closing (short-circuit closing) Circuit to be checked to remove the cause
Transmission was made with antenna of transceiver (5W or higher) Transceiver to be used at a distance at least 1 m from the electronic
Operating while in use
closely mounted on the electronic MCCB and earth leakage breaker MCCB
Shift from the short-circuit of another conductor Cause to be removed To be replaced with new one
Short-circuit on line side Accumulated dust Cause to be removed To be replaced with new one
Fall of conductor on line side Cause to be removed To be replaced with new one
Poor tightening Poor maintenance Retighten
Too high a temperature on
Contact heavily consumed End of service life To be replaced by new one
the terminal side
Intrusion of rust and dust
Temperature rise
not come on. Or, though it The battery of breaker tester has come at the end of its service life.
comes on, it goes off sonner Battery to be replaced.
tester
than normal.
Overcurrent display LED comes
on and goes off after prescribed Poor tripping mechanism To be returned for repairing.
time. But, no tripping.
107
6.2 Troubleshooting for leakage operation portion
Trouble Cause Countermeasure
Operates simultaneously Too long a wire and too large a ground electrostatic Rated sensitivity current to be changed, or
with closing (such operation capacity causes the leak current to flow
ELCB to be installed near load
Trouble- of leakage mechanism as
some popping-out of the leakage
Normal operation due to leak current Leak point to be repaired
action display button)
Operates during use Refer to 5.4
Leakage operation and the Poor lamp or its end of service life To be replaced by new one
Abnormal
like by test button, but no Display button does not come out due to poor
operation To be returned for repairing
display adjustment
Trouble in electronic circuit To be replaced by new one
No Depressing the test button
No voltage applied Apply specified voltage
operation does not lead to operation
Poor continuity of contact Remove foreign matter on the contact
108
6.4 Analysis of unnecessary operation
Operation of ELCB by the causes on purpose, leak current, electrification, ground fault etc., is normal,
while operation by other causes such as surge and induction is unnecessary (called stray operation or
nuisance trip). It seems that quite a number of users have the preconception that earth leakage circuit
breakers are troublesome as they operate unreasonably. Therefore, unnecessary operation is analyzed
and selection of correct ELCB is stated in the following text.
6.4.1 Classification of ELCB operation
ELCB operation is classified as follows;
Normal (1) Operation by leak current, electrification, ground
operation fault etc.
109
(4) Operation by surge
7kV
To surge by secondary transfer of inductive light- ELCB
1.2×50µS
ening of wires, non-operation test by lightening
impulse is set forth in JIS C-8371, and surge re- U
sistivity is ensured. Circuit of the lightening im-
pulse non-operation test is shown at right. V C
Almost all NVs of Mitsubishi are provided with a R
W
DPDC surge discrimination circuit for judging leak
Lightening impulse
current to ground by ground fault current and voltage generator
C : 0.03µF R : 0.1MΩ
surge so as to improve unnecessary operation
preventing function. Test circuit of lightening impulse non-operation
110
(7) Operation by wrong wire connection
Failure in passing the neutral wire through the ZCT
for the lines of single phase 3-wire or 3 phase 4-
wire is a simple mistake. In this case, the ELCB is ZCT
operated by single phase load current.
Load
Wrong wire connection of 3 phase 4-wire line
ZCT
Sound circuit
111
(12) Operation by carrier phone unit
Malfunctions of the ELCB can result in some cases when attached to a line provided with a carrier
phone, which enables calls through the power line.
Since the carrier phone forcefully gives high frequency signals (normally 50kHz to 400kHz) between
the line and the ground, the ELCB detects the high frequency signals as if they are leak current and
leads to malfunction. Malfunction or not depends largely on magnitude of the high frequency signals,
high frequency characteristic of the ELCB, and degree of rated sensitive current.
(13) Operation by electromagnetic wave
When a portable type transceiver is placed near the ELCB at transmission, particularly intense mag-
netic field is generated easily resulting in malfunction. Generally speaking, frequency bands of por-
table type transceivers are 27/28MHz, 50/50MHz, 150MHz, 400MHz, and 900MHz, and the output is
about 0.5 to 5W. It is confirmed that the ELCB is free from any malfunction when different kinds of
transceivers of 5W output are used for transmission being placed at 1m from the ELCB.
(14) Operation by inverters
Inverters operate many high-frequency components as they turn A.C. power supply to D.C. through
rectification, then turn to A.C. again by switching through transistors.
Increased static capacity to ground sometimes causes malfunctions as the high frequency compo-
nents are kept flowing by the static capacity to ground. To use ELCB in general in an inverter circuit, it
is necessary to select those of lower sensitive current than usual in order avoid unnecessary opera-
tion.
For ground fault detection of high sensitivity in inverter circuit and yet for stable ground fault detection
at both the primary and the secondary sides of the inverters, it is necessary to use an ELCB designed
for higher harmonic earth-leakages and surges, which is hardly affected by high frequency compo-
nents, as the measure against the inverter.
It is also essential to install the ELCB at the primary side of the inverter, and never at the secondary
side.
Inverter IM
ELCB
1C1 1C2
protect them against surge. As the surge ab- Circuit and ELCB
route of leak
sorbers connected to the ground discharge current to
Load
equipment
IS
the surge to the ground, a high leak current ground Discherge gap
type absorber
is generated to the ground, for a short time
IS
though, and unnecessary operation of the Gapless surge
absorber
ELCB is resulted in some cases.
Most Mitsubishi’s ELCB are provided with a Leak current to ground through surge absorber
DPDC surge discriminating circuit for judg-
ing ground fault current by failure such as faulty insulation from leak current to ground by surge, and
improvement in the performance of preventing unnecessary operation is realized even when the surge
absorber is installed between the line and the ground.
112
7. After-sales service
7.1 Countermeasures to be taken in case of anomaly
Should any anomaly arise while the circuit-breaker is operating, take the following countermeasures:
CAUTION
● Use to be prohibited under abnormal conditions:
Continuing to use the circuit-breaker under abnormal conditions may lead to some acci-
dents.
113
APPENDIX 1 Breaker mounting screws
■ NFB
Se- Depth Wood screw (round
wood screw)for Front- Front-connection Rear-connection Plug-in (drawout)
Required quantity per unit
ries Type of hole connection 1P 2P 3P 4P
NF30-CS, MB30-CS 10 4.1 ✕ 25 M4 ✕ 0.7 ✕ 20 M4 ✕ 0.7 ✕ 20 — — 2 2 —
NF50-SS(1P) 46 — M4 ✕ 0.7 ✕ 55 M4 ✕ 0.7 ✕ 55 — 2 — — —
NF32-SW, NF63-CW, NF63-SW, NF63-HW
NF125-CW, NF125-SW, NF125-HW
NF250-CW, NF250-SW, NF250-HW 45 4.1 ✕ 58 M4 ✕ 0.7 ✕ 55 M4 ✕ 0.7 ✕ 55 M4 ✕ 0.7 ✕ 55 — 2 2 4
MB30-SW, MB50-CW, MB50-SW
MB100-SW
M4 ✕ 0.7 ✕ 55 2 2
NF160-SW, NF160-HW, MB225-SW 45 4.1 ✕ 58 M4 ✕ 0.7 ✕ 55 M4 ✕ 0.7 ✕ 55 — 4
M4 ✕ 0.7 ✕ 73 (plug-in:4) (plug-in:4)
S NF125-SGW, NF125-HGW
· NF160-SGW, NF160-HGW 63 — M4 ✕ 0.7 ✕ 73 M4 ✕ 0.7 ✕ 73 M4 ✕ 0.7 ✕ 73 — 4 4 4
C NF250-SGW, NF250-HGW
· NF400-CP, NF400-SP, NF400-SEP
M 47 — M6 ✕ 60 M6 ✕ 72 M6 ✕ 72 — 4 4 4
· NF400-HEP, NF400-REP
E NF630-CP, NF630-SP, NF630-SEP
NF630-HEP, NF630-REP 4
15 — M6 ✕ 35 M6 ✕ 40 M6 ✕ 35 — 4 4
NF800-CEP, NF800-SDP, NF800-SEP (plug-in:6)
NF800-HEP, NF800-REP,
NF1000-SS, NF1000-SSD, NF1250-SS 18.5 — M8 ✕ 40 M8 ✕ 40 M8 ✕ 40 — 4 4 4
NF1250-SSD
NF1600-SS, NF1600-SSD 18.5 — M8 ✕ 40 M8 ✕ 40 — — 4 4 4
M10 ✕ 120 M10 ✕ 120 M12 ✕ 60 — — 4
NF2000-S, NF2500-S, NFE2000-S 85.5 — 4
(hexagonal socket bolt) (hexagonal socket bolt) (hexagonal bolt) (drawout:4)
NF3200-S, NFE3000-S — — — M12✕60(hexagonal bolt) M12✕60(hexagonal bolt) — — 4 —
NF4000-S, NFE4000-S — — — M12✕75(hexagonal bolt) M12✕60(hexagonal bolt) — — 4 —
NF125-RGW, NF250-RGW 63 — M4 ✕ 0.7 ✕ 73 M4 ✕ 0.7 ✕ 73 M4 ✕ 0.7 ✕ 73 — 4 4 —
NF125-UGW, NF250-UGW 63 — M4 ✕ 0.7 ✕ 73 M4 ✕ 0.7 ✕ 73 M4 ✕ 0.7 ✕ 73 — 4 4 4
U NF400-UEP 47/144 — M6 ✕ 65/162 M6 ✕ 72/169 M6 ✕ 72/169 — — 4 —
NF400-UEP(4P), NF630-UEP, NF800-UEP 15/112 — M6 ✕ 35/132 M6 ✕ 40/137 M6 ✕ 35/132 — — 4 6
NF1250-UR 22.5 — M8 ✕ 45 M8 ✕ 45 M8 ✕ 45 — — 4 4
— Mounting bracket — — 2 4 4 —
BH, BH-S —
BH — Mounting plate — — — — — —
BH-P, BH-PS — — — — BPA mounting base — — — —
NF50-SWU, NF100-CWU, 45 — M4 ✕ 0.7 ✕ 55 — 2 2 —
— —
NF100-SWU, NF225-CWU
UL
NF-SFW, NF-SJW, 63 — M4 ✕ 0.7 ✕ 73 — — 4 —
— —
NF-HJW
Remark 1) The attaching screws as shaded in the table above shall be delivered in the same packages as MCCB, except the plug-in connection type screws, which
shall be put into the package of plug-in type terminal block. Any other attaching screws shall be supplied by users themselves.
2) Attaching screws other than hexagonal socket bolts and hexagonal bolts are Pround head screws.
3) Any models having two types of attaching screws have different screws lengths on line and load sides.
4) NF800-UEP have no plug-in type.
Depth of hole
■ NV
Depth Wood screw (round
wood screw) for
Screw for iron plate (P round head screw) Required quantity per unit
Type of hole Front-connection Front-connection Rear-connection Plug-in 2.3P 4P
NV-2F, NV-G2N, NV-G3NA 16 4.1 ✕ 25 M4 ✕ 0.7 ✕ 35 — — 2 —
NV30-CS, MN30-CS 10 4.1 ✕ 25 M4 ✕ 0.7 ✕ 20 M4 ✕ 0.7 ✕ 20 — 2 —
NV50-CSA 10 4.1 ✕ 25 M4 ✕ 0.7 ✕ 20 M4 ✕ 0.7 ✕ 20 — 2 —
NVB50-P — — BPA mounting base — 1 —
NV32-SW, NV63-CW, NV63-SW, NV63-HW 45 4.1 ✕ 58 M4 ✕ 0.7 ✕ 55 M4 ✕ 0.7 ✕ 55 M4✕0.7✕55 2 —
NV125-CW, NV125-SW, NV125-HW 45 4.1 ✕ 58 M4 ✕ 0.7 ✕ 55 M4 ✕ 0.7 ✕ 55 M4✕0.7✕55 2 4
ELCB
M4 ✕ 0.7 ✕ 12
ZT15B · ZT30B · ZT40B — — M5 ✕ 0.8 ✕ 20 — — 4
ZCT
ZT60B · ZT80B · ZT100B — — M6 ✕ 20 — — 4
Remark 1) The attaching screws as shaded in the table above shall be delivered in the same packages as ELCB.
2) NV1000-SB and NV1200-SB have no plug-in type.
114
APPENDIX 2 Standard tightening torque for connections
Rear connection, Flush Screw A Nut C Drawout
Nut C Screw F
Bolt Stud Screw A
Bolt stud Bar stud
Bolt stud
Connection Insulation Connection
Insulation ring conductor Fig.2 base conductor Connection conductor
Fig.1 (NV100-HB) Fig.7
Connection
Bar Stud conductor Screw A Plug-in Bar Stud
Screw E
Screw A Screw E Bolt Stud Nut D Connection
conductor
Bolt stud
Bar stud
Bar stud Screw E
Insulation base Connection Plug-in terminal base
Fig.3 Fig.4 Fig.5 Plug-in terminal base conductor Fig.6
Table List of standard tightening torque for connections (Note 1) Torque in N·m
Rear connection Plug-in type drawout type
Type Connection Bolt stud Bar stud Bolt stud Bar stud Bar stud
Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7
Screw A Nut C Screw A Screw E Nut D Screw E Screw F
MCCB ELCB Size Torque Size Torque Size Torque Size Torque Size Torque Size Torque Size Torque
NF30-CS, MB30-CS NV30-CS, MN30-CS M4✕0.7 — M6 2 — — — — — — — — — —
115
APPENDIX 3 Operating force of handle
The numerical values below represent the measurements resulting from the
B
handle as pulled horizontally (arrowed direction). B size gives the dimen-
A
sions without those of auxiliary handle.
116
APPENDIX 4 Service network
Country / Region Company Address Telephone
Australia Mitsubishi Electric Australia Pty. Ltd 348 Victoria Road, Rydalmere, N.S.W. 2116, Australia 612-9684, 7586
Belgium Emac S.A. Industrialaan 1, B-1702 Groot-Bijgaarden, Belgium. 32-(0)2-4810211
Vte. Agua Santa 4211 Casilla 30-D (P.O. Box)
Chile RHONA S.A. (56-32)-610896
Viña Del Mar. Chile
Building of Innovation Center, Room No. 406A,
SHANGHAI SETSUYO TRADING CO.,LTD. 680 Guiping Road Shanghai, P.R.China 021-6485-6611
China
(Shanghai) 3F, Block 5, 103
RYODEN INTERNATIONAL LTD. 021-6475-3228
Cao Bao Road, Shanghai, China
Cra 53 No 29C-73 U.I.C.- Medellin.
Colombia Proelectrico Representaciones S.A. 574-235-00-28
COLOMBIA.
Denmark Louis Poulsen CO. A/S Geminivej 32, DK-2670 Greve, Denmark. 45-(0)43-95-95-95
9 Rostoum Street Garden City, APT. 5,
Egypt CAIRO ELECTRICAL GROUP P.O. BOX: 165-11516, 20-2-7961337
Cairo-Egypt.
Germany Mitsubishi Electric Europe B.V. German Branch. Gothaer Strasse 8, 40880 Ratingen, Germany. 49-(0)2102-4860
52, Arkadias
Greece Drepanias Antonios S.A. 30(1)57 81 599 699
STR.GR 121 32. Peristeri Athens Greece.
10/F Manulife Tower 169 Electric Road North
Hong Kong Ryoden international Ltd. 28878870
Point. Hong Kong.
JL Muara Karang Selatan Blok A/Utara No.1
Indonesia P.T.SAHABAT INDONESIA. kav. NO.11 P.O. Box 5045/Jakarta/11050. 021-6621780
Jakarta Indonesia.
Ireland Mitsubishi Electric Europe B.V. Irish Branch. Westgate Business Park, Ballymount, Dublin 24, Ireland. 353-(0)1-4505007
C.D.Colleoni-P.Perseo lng.2, Via Paracelso 12
Italy Mitsubishi Electric Europe B.V. Italy 39-(0)39 60 531
1-20041 Agrate Brianza (M1)
2 Fl. Dong Seo Game Channel Bldg ., 1F 660-11
Korea HAN NEUNG TECHNO Co., Ltd. 82-2-3668-6567
Deungchon-Dong, Kanguseo-Ku, Seoul, 157-030 Korea
Kuwait SALEM M AL-NISF ELECTRICAL CO.W.L.L. P.O. Box 4784. Safat. 13048 Kuwait. 965-484-5660
43-47 Lane Xang Road P.O. BOX 2789 VT
Lao PDR SOCIETE LAO IMPORT-EXPORT 21-215043, 21-215110
Vientiane Lao PDR.
COMPTOIR D'ELECTRICITE Cebaco Center-Block A. Autostrade Dora,
Lebanon 961-1-240430
GENERALE INTERNATIONAL P.O. BOX: 90-1314 Beirut-Lebanon.
NO. 216, Bo Aung Gyaw Street,
Myanmer PEACE MYANMAR ELECTRIC CO., LTD. 951-295426
Botataung 11161, Yangon, Myanmar.
KHA 2-65, Volt House Dilli Bazar Post Box: 2108,
Nepal Watt & Volt House Co., Ltd. 977-1-411330
kathmandu, Nepal
New Zealand Melco Sales (N.Z.) Ltd. 1 Parliament Street Lower Hutt. New Zealand. 644-569-7350
Norway SCANELEC Leirvikasen 43B, N5020 Bergen, Norway. 47-55-506000
Pakistan Prince Electric Co. 16 Brandreth Road Lahore 54000. Pakistan. 042-7654342
24th Fl. Galleria Corporate Center Edsa Cr, Ortigas Ave.
Philippines EDISON ELECTRIC INTEGRATED, INC. 02-643-8691
Quezon City, Metro Manila. Philippines.
Poland MPL Technology Sp zo.o. ul. Wroclawska 53, PL-30011 Kraków, Poland. 48-(0)12 632 28 85
Al-Nabhaniya Street-4Th Crossing,
Saudi Arabia CENTER OF ELECTRICAL GOODS Al-Hassa Road, P.O. BOX: 15955, Riyadh 11454, 966-1-4770149
Saudi Arabia.
307 Alexandra Road #05-01/02 Mitsubishi
Singapore MITSUBISHI ELECTRIC ASIA PTE LTD. 65-473-2308
Electric Building Singapore 159943
Slovenia INEA d.o.o. Ljubljanska 80, SI-61230 Domzale, Slovenia. 386-(0)17 21 80 00
South Africa Circuit Breaker Industries LTD. Private Bag 2016. Isando 1600, Johannesburg, South Africa 27-11-928-2000
Spain Mitsubishi Electric Europe B.V. Caretera De Rubi 76-80, 08190 - Sant Cugat Del Valles
34-93-595-3131
Spanish Branch. (Barcelona) Spain
Sweden Euro Energy Components AB Box 103 48 S-434 24 Kungsbcka, Sweden. 46-(0)300-69 00 40
Mühlentalstrasse 136, 8201 Schaffhausen,
Switzerland Trielec A G 41-(0)52-6258425
Switzerland
6F, NO. 105 Wu-Kung 3rd rd., Wu-Ku Hsiang,
Taiwan Setsuyo Enterprise Co., Ltd. 02-2298-8889
Taipei Hsien Taiwan
77/12 Bumrungmuang Road, Klong Mahanak,
Thailand UNITED TRADING & IMPORT CO. LTD. 223-4220-3
Pomprab Bangkok 10100.
The Netherlands Imtech Marine & Industry Postbox 5054, NL-3008 AB-Rotterdam, Netherlands. 31-(0)10 487 19 11
Barbaros Bulvari Gaziumurpasa sok. 9/4,
Turkey HEDEF DIS Tic. ve Musavirlik LTD. STI 90-(0)212-2754876
TR-Balmumcu-Istanbul, Turkey.
Mitsubishi Electric Europe B.V.
U.K. Travellers Lane, Hatfield, Herts, AL10 8xB, U.K. 44-(0)1707-276-100
UK-Branch.
Uruguay Fierro Vignoli S.A. P.O. box 20022/Suc Upae, Montevideo. Uruguay. 598-2-92-08-08
Lle 8, Calpon Elinsu,
Venezuela ADESCO C.A. La Urbina-EDO, Miranda P.O. 58-2-241-7634
BOX 78034 Caracas 1074A., Venezuela
Vietnam Sa Giang Techno Co., Ltd. 207/4 Nguyen Van Thu St., Dist 1, Ho Chi Minh City, Vietnam 848-821-6453
117
MEMO
MEMO
MOULDED CASE CIRCUIT BREAKERS,
EARTH LEAKAGE CIRCUIT BREAKERS,
EARTH LEAKAGE RELAYS &
CIRCUIT PROTECTORS
Safety Tips : Be sure to read the instruction manual fully befofe using this product.
FACTORY AUTOMATION SYSTEM: OFFICE TOWER “Z” 14F, 8-12 1chome, Harumi CHUO-KU, TOKYO 104-6212, JAPAN