GE Digital Energy

Power Quality

Zenith ZTG Series

Low-Voltage Automatic Transfer Switches

GEs Zenith ZTG Series switches are built for

standard applications requiring the dependability
and ease of operation found in a power
contactor switch.

Ratings 40 to 3000 amps (2, 3 or 4 poles)

UL 1008 listed at 480 VAC
CSA certied at 600 VAC (200-260 amps - 480V)
IEC listed at 480V
NFPA 70, 99, 101 and 110
IEEE 446 and 241
NEC 517, 700, 701 and 702
NEMA ICS2-447
UL 508 and 50
ANSI C33.76
ICS 6
NEMA 250
Equipment (Controls and Power Section)
Seismic Test Qualied to:
 IBC-2006
 IEEE-693-2005
Double throw, mechanically
interlocked contactor mechanism
Electrically operated, mechanically held
Designed for emergency and
standby applications
Available in standard (ZTG) or
delayed transition (ZTGD) models

Fully Approved
UL , CSA and IEC listed
NFPA 70, 99 101 and 110
IEEE 446 and 241
NEC 517, 700, 701 and 702
NEMA ICS2-447
UL 508 and 50
ANSI C33.76
ICS 6
NEMA 250
IBC-2006

ZTG switches are equipped with GEs Zenith

MX150 microprocessor panel, which controls
the operation and displays the status of the
transfer switchs position, timers and available
sources. As an embedded digital controller,
the MX150 offers high reliability and ease of
unattended operation across a range of
applications. The MX150 features include:

Timer and voltage/frequency settings

adjustable without disconnection from
the power section
Built-in diagnostics with an LCD display
for immediate troubleshooting
LED/LCD indicators for ease of viewing
and long life
Nonvolatile memoryclock battery backup
not required for standard switch operation
Processor and digital circuitry isolated
from line voltage
Inputs optoisolated for high electrical
immunity to transients and noise
Communications network interface

Conducted and Radiated Emissions per

EN55022 Class B (CISPR 22) (Exceeds
EN55011 & MILSTD 461 Class 3)
ESD immunity test per EN61000-4-2
Class B (Level 4)
Radiated RF, electromagnetic eld
immunity test per EN61000-4-3
(ENV50140) 10v/m
Electrical fast transient/burst immunity
test per EN61000-4-4
Surge immunity test per EN61000-4-5
IEEE C62.41 (1.2 X 50s, 0.5 & 4 kV)

IEEE-693-2005

Conducted immunity test per

EN61000-4-6 (ENV50141)

Ringing wave immunity per

IEEE 472 (ANSI C37.90A)

Voltage dips and interruption immunity

EN61000-4-11

PB-1201 Page 2

Design and Construction Features

Close dierential 3 phase under-voltage
sensing of Source 1 (normal)factory
standard setting 90% pickup, 80%
dropout (adjustable); under-frequency
sensing of Source 1 factory setting
95% pickup (adjustable)
Voltage and frequency sensing of the
Source 2 (emergency)factory standard
setting 90% pickup voltage, 95% pickup
frequency (adjustable)
Test switch (fast test/load/no load) to
simulate Source 1 (normal) failure
automatically bypassed should the
Source 2 (emergency) fail
NEMA Type 1 enclosure is standard
also available in open style or NEMA
Types 3R, 4, 4X or 12

MX150 Control Panel

S 1

Standard Features (MSTDG Option Pkg.)

* E *

OK

6/P

Test Switch, Momentary

A3

Auxiliary Contact: Closed when the switch is in the Source 2 position (S2)

A4

Auxiliary Contact: Closed when the switch is in the Source 1 position (S1)

CALIBRATE

Capabilities are available for Frequency and AB, BC, CA Phase to Phase
voltage for both Sources

CDT

Daily 7, 14, 28 timed exercise (CDT memory backup battery included),

pushbutton/timer operation

Engine Start Contact

EL/P

Event Log of 16 Events that track date, time, reason and action taken

J1E

Adjustable under frequency sensor for S2

K/P

Voltage and Frequency Indication for S1 and S2

Indicating LED Pilot Lights:

2 1 : 5 6
MON
MOR E

1 0

AP R

MX150

Front View

2 0 0 9

T E S T

L1
L2
L3
L4

Indicates switch in S2 position

Indicates switch in S1 position
Indicates S1 source available
Indicates S2 source available

P1

Time Delay to Engine Start

Q2

Peak Shave / Remote Load Test

R50

In-Phase Monitor, self-adjusting

Time Delay on Retransfer to Normal: To delay retransfer to S1

(immediate retransfer on S2 failure)

R2E

Under voltage sensing of S2

S13

Microprocessor activated commit / no commit on tranferring to S2

Time Delay for Engine Cool Down: Allows engine to run unloaded after
switch retransfer to S1

Time Delay on Transfer to Emergency: To delay transfer to S2 after availability

YEN

Pushbutton Bypass of T & W Timers

When specified for use with a ZTGD Series delayed transition switch, the control panel
also includes the following:
DT

Time Delay from Neutral Switch Position to S1 on Retransfer

DW

Time Delay from Neutral Switch Position to S2

LN/P

Center-Off position/Off Delay Timing indicating lights

Additional Standard Features (MEXEG Option Pkg.)

CDP

Clock Exerciser Load/No Load (Replaces CDT Exerciser Option)

VI

Voltage Imbalance Monitor (Three Phase)

Page 3 PB-1201

Zenith ZTG Series Ordering Information

A 0

Z
MODEL/TYPE

CONTROL
PANEL

Z E C
APPLICATION

AMPERE SIZE SWITCHED

POLES

Z V C

ENCLOSURE TYPE

OPERATIONAL VOLTAGE

ACCESSORIES

M S T D

Z T G 0 0 0

A 0

0 0 4

0 1

A B

Standard (Open Transition)

Entelli-Switch 150
Microprocessor
Control Unit

Utility - Generator

40 amps

2 Poles

Type 1 Enclosure

Consult Table Below

0 0 8

1 2

Utility - Utility

80 amps

3 Poles

Type 12 Enclosure

0 1 0

3 R

Manual Transfer

100 amps

4 Poles

Type 3R Enclosure

Z T G D 0 0
Delayed Transition

Switch Types
Standard: Unless otherwise noted, the
standard switch with quick transfer will
be supplied.
Delayed Transition: When ordered as
the ZTGD, the delayed transition switch
offers time delay during transfer from
one position to the other. This is primarily
for transfer of large motor or inductive
loads. The operation of the delayed
transition switch is totally independent
of the synchronism of the power sources,
eliminating the need for in-phase monitors
or extensive motor-disconnect control
wiring between the transfer switch and
motor control centers.

ZTG000A00040F-ZEC01ZVC40MSTD

UL 1008 Withstand
and Closing Ratings
Please refer to GE Publication TB-1102.

PB-1201 Page 4

Then choose
additional accessories

6A

4 0

150 amps

Type 4 Enclosure

0 2 0

4 X

200 amps

Type 4X Enclosure

A1

0 2 2

0 0

A1E

225 amps

Open Style Unit

6AP

A3

0 2 6
260 amps

0 4 0
400 amps

0 6 0
600 amps

0 8 0
800 amps

1 0 0
1000 amps

1 2 0
1200 amps

1 6 0
1600 amps

2000 amps

2 6 0
2600 amps

This number string shows the correct format

for a ZTG Series Automatic Transfer Switch
with an MX150 microprocessor control unit,
Utility - Generator, 400 amps, 4 pole, NEMA
Type 1 enclosure, 120/208V 3, 4 wire, 60 Hz
system with the standard group of accessories.

M A N O

0 1 5

2 0 0

Example

M E X E

3 0 0
3000 amps

Voltage Phase

1
2
2
3
3
3
3
4
4
4
5
5
5
5
5
5
6
6
6
7
7
7
7
8
9
9
9
9
9

0
0
2
0
1
2
5
0
1
2
0
1
2
5
7
8
0
1
3
0
1
4
5
2
0
1
2
3
7

120
120/240
110/220
240
208
220
139/240
120/208
127/220
127/220
480
440
440
460
480
254/440
575
347/600
575
277/480
277
266/460
460
380
240/416
220/380
220/380
240/416
380

1
1
1
3
3
3
3
3
3
3
3
3
3
1
1
3
3
3
1
3
1
3
3
1
3
3
3
3
3

Cong.

Hz

A4

2 wire
3 wire
3 wire
3 wire
3 wire
3 wire
4 wire
4 wire
4 wire
4 wire
3 wire
3 wire
3 wire
3 wire
2 wire
4 wire
3 wire
4 wire
2 wire
4 wire
2 wire
4 wire
3 wire
2 wire
4 wire
4 wire
4 wire
4 wire
3 wire

60
60
50
60
60
50
60
60
60
50
60
60
50
50
60
60
60
60
60
60
60
60
60
50
60
60
50
50
60

A62

Note: Operating voltage must be specified at time of order.

Only the most common voltages are shown above.

ATGEW-X
CTAP
DS
HT
LCM
M90
M90A
M90B
M91
M91A
M91B
MCM
OCVR-1SG
OCVR-1SS
T3/W3
UMD
VI
None

Options
6A

Test Switch, Maintained

6AP

Test Switch, Maintained Programmable

A1

Auxiliary Contact, operates on Source 1 line failure

A1E

Auxiliary Contact, operates on Source 2 line failure

A3

Auxiliary Contacts: Closed when the transfer switch is in Source 2 position

A4

Auxiliary Contacts: Closed when the transfer switch is in Source 1 position

A62

Sequential Universal Motor Load Disconnect Circuit. Normally closed

Auxiliary contacts for Motor Loads. Open 0-60 seconds pior to transfer,
after transfer, or both in either direction then reclose in timed sequence
after transfer.

ATGEW-X

Extended annual parts and labor warranty (1-4 years for a total of 5 years max.)

CTAP

Alarm panel on transfer to emergency w/silence button & light

DS

Inhibits transfer in either direction when in inhibit. Allows automatic

operation when in Auto (Standard on 800A and above)

HT

Heater and Thermostat

LCM

LonWorks Communication Module

MCM

Modbus RTU Communication Module

M90 Series Power Measurement Meters (Not available in NEMA 4 enclosure)

M90

EPM2000 True RMS Digital Meter with display (Amps, Volts, Power,
Energy, Power Factory and Frequency). 3 Line LED Display. 50/60 Hz
Universal Operation. 1 or 3 phase. Standard Modbus RTU RS485
communications capability. 40 - 1200 Amps.

M90A

Adds Pre-Wiring for Enervista Viewpoint Monitoring of M90

Accessory & ATS Status using Modbus RS485 Serial Communications

M90B

Adds Pre-Wiring for Enervista Viewpoint Monitoring of M90

Accessory & ATS Status using Ethernet TCP/IP Communications

M91

EPM6000 True RMS Digital Meter with display (Amps, Volts, Power,
Energy, Power Factory and Frequency, THD). Certified energy and
demand metering. Meets ANSI C12.20 and IEC 687 Accuracy Classes.
Front IrDA Port Laptop Connection. Standard Modbus RTU RS485 or
DNP 3.0 communications capability.

M91A

Adds Pre-Wiring for Enervista Viewpoint Monitoring of M91

Accessory & ATS Status using Modbus RS485 Serial Communications

M91B

Adds Pre-Wiring for Enervista Viewpoint Monitoring of M91

Accessory & ATS Status using Ethernet TCP/IP Communications

OCVR-1SG

Lockable see-through microprocessor cover for NEMA 3R or 12

OCVR-1SS

Lockable see-through microprocessor and meters cover for NEMA 3R or 12

T3/W3

Elevator Pre-Signal Auxiliary Contacts: Open 0-60 seconds prior to

transfer to either direction, re-closes after transfer.

UMD

Universal Motor Load Disconnect Circuit: Auxiliary Contact opens

0-5 minutes prior to transfer in either direction, re-closes after transfer.
Can be configured by end user for Pre-transfer, Post-transfer, or both.

VI

Voltage Imbalance Monitor (Three Phase)

NOTE:
For additional options or other configurations, contact the GE factory.

Page 5 PB-1201

Reference Charts
Testing Standards
UL, CSA and IEC listed

UL 1008, CSA 22.2 No. 178, IEC 947-6-1

Ringing wave immunity

IEEE 472 (ANSI C37.90A)

Conducted and radiated emissions

EN55022 Class B (CISPR 22)

(Exceeds EN55011 & MILSTD 461 Class 3)

ESD immunity test

EN61000-4-2 Class B (Level 4)

Radiated RF, electromagnetic field immunity test

EN61000-4-3 (ENV50140) 10v/m

Electrical fast, transient/burst immunity test

EN61000-4-4

Surge immunity test

EN61000-4-5 IEEE C62.41

Conducted immunity test

EN61000-4-6 (ENV50141)

Voltage dips and interruption immunity

EN61000-4-11

1.2 X 50s, 0.5 to 4 kV

ZTG AL/CU UL Listed Solderless Screw-Type Terminals for External Power Connections *

Normal, Emergency and Load Terminals

Range of Wire Sizes

Switch Size (Amps)

Cables per Phase & Neutral

40

#8 to 3/0

8-85 mm2

#6 to 250 MCM

13-127 mm2

260

#6 to 350 MCM

13-177 mm2

400

#4 to 600 MCM

21-304 mm2

#2 to 600 MCM

33-304 mm2

#2 to 600 MCM

33-304 mm2

80
100
150

200, 225

600

800, 1000, 1200

1600, 2000, 2600, 3000

* For ZTGD Series data, contact the GE factory

Standard MX150 Control Setting Ranges

Control Function

Range

Factory Setting

75-98%
85-100%
75-98%
85-100%
88-98%
90-100%

80%
90%
80%
90%
90%
95%

Time Delay Engine Start (Acc. P1)

0-10 seconds

3 seconds

Time Delay Engine Cool Down (Acc. U)

0-60 minutes

5 minutes

Source 1 Line Sensing Under-voltage Dropout/Pickup

MSTDG

Source 2 Line Sensing Under-voltage Dropout/Pickup

Source 2 Line Sensing Under-frequency Dropout/Pickup

Time Delay Transfer to Source 2 (Acc. W)

Time Delay Retransfer to Source 1 (Acc. T)
Time Delay Motor Disconnect or Transfer Presignal (Acc. UMD, or T3/W3)
Delayed Transition Time Delays (DT, DW)

Options

MEXEG

Event Exerciser (CDT)

Programmable Event Exerciser (CDP)
Voltage Imbalance (VI)
Elevator Pre-Signal (T3/W3)
Sequential Motor Load Disconnect (A62)
Motor Load Disconnect (UMD)

PB-1201 Page 6

0-5 minutes

1 second

0-60 minutes
0-60 seconds
0-10 minutes

30 minutes
20 seconds
5 seconds

5-60 min.-1,7,14 or 28 days load or no load

20 min. - 7 days no load

365 day cycle, load or no load

0 min. - 7 days no load

5-20% nominal; 10-30 sec.

10% Fail, 8% Restore; 30 sec.

0-60 seconds
0-5 minutes
0-60 seconds

20 seconds
20 seconds
5 seconds

Dimensional and Weight Specications

ZTG and ZTGD Model, Dimensions and Weight
Model

Ampere
Rating
40, 80
100, 150
200
225
260
400

ZTG

600
800

1000, 1200

NEMA 1
Poles

Weight

Height
(A)

Width
(B)

Depth
(C)

24 (61)

18 (46)

11 (28)

Ref.
Figure

2, 3

4
2, 3
4

46 (117)

24 (61)

NEMA 1

14 (6)

69 (31)

20 (9)

75 (34)

59 (27)

69 (31)

14 (36)

70 (32)

75 (34)

59 (27)

114 (52)

70 (32)

125 (57)

2, 3

59 (27)

168 (76)

70 (32)

180 (82)

71 (32)

224 (102)

2, 3
4

66 (168)

24 (61)

19.5 (50)

81 (37)

214 (97)

190 (86)

460 (209)

210 (95)

490 (222)

190 (86)

475 (216)

210 (95)

560 (254)

345 (156)

1030 (467)

450 (204)

1180 (535)

465 (211)

1150 (522)

670 (304)

1400 (635)

2, 3

18 (8)

127 (58)

24 (11)

133 (60)

2, 3

65 (29)

176 (80)

76 (34)

188 (85)

77 (35)

221 (100)

2, 3
B

4
2, 3

74 (188)

40 (102)

Application
Notes

1-6

4
2, 3

Open
Type

19.5 (50)

1-5

1 - 5, 7

1600, 2000
4
90 (229)

35.5 (90)

48 (122)

1 - 5, 7-8

2600, 3000

40, 80
100, 150
200, 225

260, 400
ZTGD

600
800, 1000, 1200
1600, 2000
2600, 3000

1-6
4

2, 3
4
2, 3
4
3
4
3
4

1. Metric dimensions (cm) and weights (kg) shown in

parentheses adjacent to English measurements.
2. Includes 1.25" door projection beyond base depth.
Allow a minimum of 3" additional depth for projection
of handle, lights, switches, pushbuttons, etc.
3. All dimensions and weights are approximate and
subject to change without notice.
4. Packing materials must be added to weights shown.
Allow 15% additional weight for cartons, skids,
crates, etc.
5. Special enclosure (NEMA 3R, 4, 4X, 12, etc.)
dimensions and layouts may differ. Consult the
GE factory for details.
6. A ZTG(D) 40-225A, when ordered with the following
options, will require a larger enclosure: A62(T),
Digital Meter, HT, OCVR-1SG, OCVR-1SS.
Contact the GE factory for dimensions.
7. Add 3" in height for removable lifting eyes.
8. Ventilation louvers on side and rear of enclosure
at 1600-3000 amps. One set of louvers must be
clear for airflow with standard cable connections.

46 (117)

66 (168)

24 (61)

24 (61)

14 (36)

19.5 (50)
B

74 (188)

40 (102)

19.5 (50)

90 (229)

35.5 (90)

48 (122)

87 (39)

230 (104)

210 (95)

475 (215)

230 (104)
365 (166)
470 (213)
485 (220)
690 (313)

560 (254)
1030 (467)
1180 (535)
1150 (522)
1400 (635)

1-5

1 - 5, 7

1 - 5, 7-8

Reference Figures

Figure A

Figure B

Figure C

Page 7 PB-1201

Contact Us
We protect and connect the worlds
ensure

critical equipment to

safe, reliable power

Assembled in the USA

GE Digital Energy Power Quality

701 E 22nd Street, Lombard, IL 60148 USA
800 637 1738 www.gedigitalenergy.com/ats

Information subject to change without notice. Please verify all details with GE.
2009 General Electric Company All Rights Reserved
PB-1201 (10/09)