© Siemens AG 2017

SITOP power supply

SITOP PSE200U
Electronic protection of 24 V DC load circuits
with fast fault detection

Edition
Brochure 01/2017 siemens.com/sitop
 © Siemens AG 2017

The SITOP PSE200U selectivity module distributes the SITOP PSE200U - optimized for switched-mode power
load current across several 24 V DC load circuits and supply units
monitors them reliably for overload and short-circuit
conditions. The electronics permit brief current peaks The SITOP PSE200U is specially designed to protect 24 V
caused, for example, by high inrush currents, but iso- DC individual load circuits supplied by switched-mode
late 24 V DC load circuits in the event of an extended power supplies. Individual setting of the tripping current
overload. This is ensured even on high-resistance lines allows optimum adaptation to the respective load circuit.
and in the case of "creeping" short-circuits. In such Engineering effort is minimal since the switch-off charac-
cases, miniature circuit breakers fail to trip, or trip too teristic always guarantees reliable tripping – even with
late, even if the power supply unit could deliver the high line impedances that limit the short-circuit current.
required tripping current. The SITOP PSE200U continues SITOP PSE200U reliably disconnects the faulty path as soon
to supply 24 V DC to the load circuits not affected by an as the current exceeds the set value by a small amount.
overload – a feature which avoids a possible total sys-
tem failure. The single-channel signaling version facili- Immediate switch-off increases plant availability
tates fast, channel-specific fault localization via just
one digital input at the PLC. SITOP PSE200U also has another important function: The
electronics continuously monitor the 24 V DC input volt-
Miniature circuit breakers with high current consumption age. As soon as the 24 V DC threatens to fail, the path
with a higher current than the set current is disconnected
Miniature circuit breakers are often still used for the selec- immediately. All other circuits continue to be supplied
tive protection of 24 V DC load circuits. In many cases, without interruption. Even PLCs, which can only bridge
however, when interacting with switched-mode power power failures for a few milliseconds, continue to run
supply units, they do not offer reliable protection. They without problems.
require several times the rated current in order to trip
within a few milliseconds. Because stabilized power sup-
plies limit their output current electronically when there is
a critical overload, the tripping current is not always guar- Shutdown characteristic
anteed. This can cause the 24-V supply to break in and the
PLC to go to Stop. Even if the power supply unit could sup- 100.0 sec
ply the current, immediate tripping is not necessarily
10.0 sec
assured, because with this high current requirement, the
Tripping time

5.0 sec
line resistance can no longer be neglected. It prevents the 1.0 sec
required tripping current from flowing. Therefore fast trip-
ping is only possible up to certain cable lengths and start- 0.1 sec
0.1 sec
ing from larger cable cross-sections. In addition to the line
resistance, the overall circuit design (e.g. contact resis- 0.0 sec
0% 50 % 100 % 150 %
tances at terminals) must be taken into consideration
when configuring miniature circuit breakers. Load current I/I threshold

Response with current requirements per output circuit ...

■ From 0 A up to set value (I/I threshold = 100 %)
no shutdown
■ From set value up to 150 %1)
shutdown after approx. 5 s
■ Above 150 %1) of set value
current limiting to approx. 150 %1) for typ. 100 ms,
then shutdown
■ Above set value with simultaneous collapse of supply
voltage below 20 V DC
immediate shutdown

1)
Versions with NEC Class 2: 110%

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 © Siemens AG 2017

Your benefits at a glance

 Reliable tripping regardless of cable lengths or

cross-sections
 Four 24 V DC load circuits per module, with adjustable
output current range of 0.5 to 3 A or 3 to 10 A
 Versions with power limitation of the outputs to
100 VA according to NEC Class 2
 Easy configuration thanks to individual setting o
f maximum output current using potentiometers
 Two versions for remote diagnostics: common
signaling contact or single-channel signaling
 Evaluation of individual channels via free of charge
SIMATIC S7 or SIMOTION function blocks or LOGO! Power Selectivity PLC HMI Actuators Sensors
software supply unit module

 Library for visualization in SIMATIC PCS 7

 Remote reset possible from a central location

G_KT01_XX_00122
 3-color LEDs for fast on-site fault localization
 Simple commissioning thanks to manual switch on/
off of load circuits using reset button 24 V DC

 Voltage measuring points for output currents

(1 V = 1 A), disconnecting of load circuit is not required
As electronic monitor, the SITOP PSE200U selectivity module switches
 Sequential connection delay of individual 24 V DC faulty 24 V DC load circuits off immediately, and continues to supply
load circuits reduces total inrush current the other 24 V DC load circuits without any interruption.

 Sealable transparent cover protects against malad-

justment of tripping currents and sequential delay

SITOP PSE200U - all connections, functions and options at a glance

Outputs 1-4,
Versions
0.5...3 A/ 3...10 A/ Common signaling contact
0.5...3 A according to NEC Class 2 or single-channel signaling

Remote reset (24-V signal)

Current monitor: Device identification label

Measuring points for output current (not included in scope of delivery)
by means of voltage measurement: 1 V = 1 A
3-color status LED per output:
green: connected
Pushbutton for On/Off/Reset for each output orange: manually disconnected
red: disconnected due to overload
Potentiometer for setting the tripping
current Switch for setting the delay
time to 0, 25, 100 ms or
load-optimized

Labeling field per output Sealable transparent cover

24-V DC supply 0-V supply

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 © Siemens AG 2017

Sequential switching on reduces burden on the power Fast, channel-exact diagnostics

supply

By switching on the outputs sequentially, the inrush cur- The SITOP PSE200U module with single-channel signaling
rent that the power supply has to provide is considerably requires only one digital input for signaling the switched-
reduced. This avoids the danger of a voltage dip which off output to the controller. Evaluation is carried out using
could result in disturbances within the plant. A power sup- a SIMATIC S7 or SIMOTION function block, or in the LOGO!
ply with a lower rated output current can possibly also be software, enabling simple integration into the diagnostics
used. The connection delay can be set to 0 ms (all outputs and host control or HMI systems.
simultaneously), 25 ms or 100 ms, or on a load-optimized
basis. The delay time between the outputs is identical.
Only if the setting "load-optimized" is selected, does the SITOP PSE200U with single-channel signaling:
next output not switch until the previous one is below the Cyclic signaling of channel states
set value.

Max. total current without sequential switching on 1 1 0 1

OUT 1
Signal OUT 2 1 digital
output OUT 3 input
OUT 4
Output current

The SITOP PSE200U module with single-channel signaling outputs

Max. total current with sequential switching on the status of the 4 outputs cyclically by means of a serial code
which can be read in by a digital input, e.g. of a PLC. Function
blocks for SIMATIC S7-1500/1200/300/400, ET200 SP/ET200 S for
STEP 7 Classic and TIA Portal as well as for SIMOTION SCOUT and
SIMOTION CPUs are available free-of-charge for the evaluation. As
an application example you will also find the integration in LOGO!
logic modules. Further information and downloads:
Activation Time t
SIMATIC S7:
Output 1 Output 2 Output 3 Output 4 http://support.automation.siemens.com/WW/view/en/61450284
Total current without sequential switching on SIMOTION:
Total current current with sequential switching on http://support.automation.siemens.com/WW/view/en/82555461

Output current of the outputs LOGO!:

http://www.siemens.com/logo-application-examples

Simple output current measurement

Easy visualization in the SIMATIC PCS 7 process control system
The selectivity module has a measuring point (MP) for is made possible by the SITOP library which contains the func-
each output, via which the current value at any moment is tion blocks and faceplates for individual channel and common
output. Because one volt corresponds to one ampere, sim- signaling:
ple voltage measurement is possible for determining the http://support.industry.siemens.com/cs/ww/en/view/109476154
current without having to disconnect the cable. The 24 V
supply of the feeder is not interrupted and the system
remains completely in operation.

Current monitor

MP: 1 V = 1 A

0V

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 © Siemens AG 2017

Technical specifications New: NEC Class 2 version New: NEC Class 2 version

SITOP PSE200U with common signaling contact SITOP PSE200U with single-channel signaling
Article number 6EP1961-2BA11 6EP1961-2BA21 6EP1961-2BA31 6EP1961-2BA41
... with NEC Class 2 6EP1961-2BA51 6EP1961-2BA61
Input
Rated voltage Vin rated 24 V DC
Voltage range 22 ... 30 V DC
Input current 40 A max.
Output
Rated voltage Vout rated Typ. Uin – 0.2 V
Number of outputs 4 4 4 4
Rated current Iout rated up to +60 °C 3A 10 A 3A 10 A
per output
Setting range per output 0.5 ... 3 A 3 ... 10 A 0.5 ... 3 A 3 ... 10 A
Set time delay 0 ms, 25 ms or 100 ms (identical between outputs) or
load-optimized (as soon as the previous output is less than the set rated value)
Efficiency at Vout rated , Iout rated Typ. 99%
Protection and monitoring
Status displays Three-color LED per output: green for output connected, yellow for output manually disconnected,
red for output disconnected due to overload/short-circuit
Signal output Common signaling contact, changeover contact, Single-channel signaling: cyclic signaling for
contact rating 24 V/0.5 A channel-specific evaluation using SIMATIC S7
function block

Protection class Class III

Degree of protection (EN 60 529) IP20
Certifications UR (UL 2367), cURus (UL 508, CSA C22.2 No. 107.1) cCSAus (Class I Div 2), ATEX (EN 60079-0, -15), GL 1),
ABS 1), 6EP1961-2BA51/6EP1961-2BA61: NEC Class 2
Connections
Input +24 V 2 screw-type terminals for 0.5 ... 10 mm2
(load and electronics supply)
Input 0 V (electronics supply) 2 screw-type terminals for 0.5 ... 4 mm2
Outputs 1 to 4 1 screw-type terminal per output for 0.5 ... 4 mm2
Signal output 3 screw-type terminals for 0.5 ... 4 mm2 1 screw-type terminal for 0.5 ... 4 mm2
Remote reset 1 screw-type terminal for 0.5 ... 4 mm 2

General data
Emitted interference EN 61000-6-3, EN 55022 Class B
Noise immunity EN 61000-6-2
Ambient temperature range 0 ... +60°C (-25 to +85°C transport/storage)
Mounting DIN rail EN 60715 35 x 7.5/15
Dimensions 72 × 80 × 72 72 × 80 × 72 72 × 80 × 72 72 × 80 × 72
(width × height × depth) in mm
Weight Approx. 170 g Approx. 220 g Approx. 170 g Approx. 220 g
Accessories Device identification label 20 mm x 7 mm, 340 units. Article No. 3RT1900-1SB20
1)
6EP1961-2BA51 and 6EP1961-2BA61: GL and ABS available soon

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 © Siemens AG 2017

Get more information: Security information

More on the SITOP PSE200U selectivity module: Siemens provides products and solutions with industrial
www.siemens.com/sitop-select security functions that support the secure operation of
plants, systems, machines and networks.
Using the SITOP Selection Tool to select the appropriate
power supply: In order to protect plants, systems, machines and networks
www.siemens.com/sitop-selection-tool against cyber threats, it is necessary to implement – and
continuously maintain – a holistic, state-of-the-art indus-
Using the TIA Selection Tool to select the appropriate
trial security concept. Siemens’ products and solutions only
power supply, including add-on module:
form one element of such a concept.
www.siemens.com/tia-selection-tool
Customer is responsible to prevent unauthorized access to
Operating instructions for downloading:
its plants, systems, machines and networks. Systems,
www.siemens.com/sitop/manuals
machines and components should only be connected to the
CAx data (2D, 3D, circuit diagram macro) as download: enterprise network or the internet if and to the extent
www.siemens.com/sitop-cax necessary and with appropriate security measures (e.g. use
of firewalls and network segmentation) in place.
Find your personal contact partners at:
www.siemens.com/automation-contact Additionally, Siemens’ guidance on appropriate security
measures should be taken into account. For more informa-
tion about industrial security, please visit
Siemens AG http://www.siemens.com/industrialsecurity.
Process Industries and Drives
Process Automation Siemens’ products and solutions undergo continuous
Postfach 48 48 development to make them more secure. Siemens strongly
90026 Nürnberg recommends to apply product updates as soon as available
Germany and to always use the latest product versions. Use of
product versions that are no longer supported, and failure
© Siemens AG 2017 to apply latest updates may increase customer’s exposure
Subject to change without prior notice to cyber threats.
Article No.: 6ZB5341-0AH02-0BA4
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The information provided in this catalog contains merely general

descriptions or characteristics of performance which in case of actual
use do not always apply as described or which may change as a result
of further development of the products. An obligation to provide the
respective characteristics shall only exist if expressly agreed in the
terms of contract. Availability and technical specifications are subject
to change without notice.
All product designations may be trademarks or product names
of Siemens AG or supplier companies whose use by third parties
for their own purposes could violate the rights of the owners.

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