CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

POWER SUPPLY
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AC 100-240V wide-range Input
Width only 65mm
Efficiency up to 92.6%
ATEX and IECEx approved
Excellent partial load efficiency
Safe HiccupPLUS overload mode
Easy fuse breaking due to high overload current(typ. 120A for 15ms)
Active Power Factor Correction (PFC)
Minimal inrush current surge
Full power between -25°C and +60°C
DC-OK relay contact
Current sharing feature for parallel use
3 year warranty

PRODUCT DESCRIPTIONSHORT-FORM DATAThe Dimension C-Series are cost optimized power supplies
without compromising quality, reliability and performance. The
C-Series is part of the DIMENSION power supply family. The mostoutstanding features of CPS20.121 are the high efficiency,
electronic inrush current limitation, active PFC, wide operationaltemperature range. The small size is achieved by a synchronousrectification and further technological design details.

Output voltage
Adjustment range

The C-Series includes all the essential basic functions.
Additionally, the CPS20.121 can deliver about 4 times the nominal
output current for 15ms which helps to trip fuses on faulty output
branches.
High immunity to transients and power surges as well as low
electromagnetic emission, a DC-OK relay contact and a large
international approval package for a variety of applications makes
this unit suitable for nearly every situation.

ORDER NUMBERS

Output current

Output current

Output ripple
AC Input voltage
Mains frequency
AC Input current
Power factor
AC Inrush current
Efficiency
Power losses
Temperature range
Hold-up time
Dimensions (WxHxD)
WeightDC 12Vnominal
12 - 15Vdc
factory setting 12.0V
AC 120-240V mains
30A
up to +60°C ambient
22.5A
at +70°C ambient
AC 100V mains
20.4-17.5A
up to +60°C ambient
12.8-10.9A
at +70°C ambient
Derate between +60°C and +70°C< 100mVpp
20Hz to 20MHz
AC 100-240V-15%/+10%
50-60Hz±6%
4.1 / 2.3A
at 120 / 230Vac
0.99 / 0.95
at 120 / 230Vac
9 / 7A peakat 120 / 230Vac
91.4 / 92.6%
at 120 / 230Vac
33.9 / 28.8W
at 120 / 230Vac-25°C to +70°C
operational
35 / 35ms
120 / 230Vac
65x124x127mm
1000g

MAIN APPROVALSPower Supply

CPS20.121

12-15V Standard unit

Accessory

ZM2.WALL
ZM13.SIDE
YR80.242
YR40.245

Wall mount bracket
Side mount bracket
Redundancy module
Redundancy module

For details and a the complete approval list, see chapter 19.

UL 508

UL 60950-1

ATEX

IECEx

Class I Div 2

MarineOct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

INDEX
Page
1. Intended Use ................................................................ 3
2. Installation Instructions ................................................ 3
3. AC-Input ....................................................................... 5
4. DC-Input ....................................................................... 6
5. Input Inrush Current ..................................................... 6
6. Output .......................................................................... 7
7. Hold-up Time ................................................................ 9
8. DC-OK Relay Contact .................................................... 9
9. Efficiency and Power Losses ....................................... 10
10. Lifetime Expectancy and MTBF .................................. 11
11. Functional Diagram .................................................... 11
12. Terminals and Wiring ................................................. 12
13. Front Side and User Elements .................................... 13
14. EMC ............................................................................ 14
15. Environment ............................................................... 15
16. Protection Features .................................................... 16
17. Safety Features........................................................... 16
18. Dielectric Strength ...................................................... 17
19. Approved, Fulfilled or Tested Standards .................... 18
20. Regulatory Product Compliance ................................. 19
21. Physical Dimensions and Weight ................................ 20Page
22. Accessories................................................................. 21
22.1. ZM2.WALL - Wall Mounting Bracket ................ 21
22.2. ZM13.SIDE - Side Mounting Bracket................. 21
22.3. YR80.242 - Redundancy Modules..................... 2222.4. YR40.245 - Redundancy Modules..................... 22
23. Application Notes....................................................... 2323.1. Peak Current Capability .................................... 2323.2. Back-feeding Loads .......................................... 23
23.3. External Input Protection ................................. 24
23.4. Output Circuit Breakers .................................... 24
23.5. Parallel Use to Increase Output Power ............ 25
23.6. Parallel Use for Redundancy ............................ 25
23.7. Series Operation............................................... 26
23.8. Inductive and Capacitive Loads ........................ 26
23.9. Charging of Batteries ........................................ 26
23.10. Operation on Two Phases ................................ 27
23.11. Use in a Tightly Sealed Enclosure ..................... 27
23.12. Mounting Orientations ..................................... 28

The information presented in this document is believed to be accurate and reliable and may change without notice.
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.

TERMINOLOGY AND ABREVIATIONSPE andsymbolPE is the abbreviation for Protective Earth and has the same meaning as the symbol.

Earth, Ground

This document uses the term “earth” which is the same as the U.S. term “ground”.

t.b.d.

To be defined, value or description will follow later.

AC 230V

A figure displayed with the AC or DC before the value represents a nominal voltage with standard tolerances(usually ±15%) included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)

230VacA figure with the unit (Vac) at the end is a momentary figure without any additional tolerances included.

50Hz vs. 60Hz

As long as not otherwise stated, AC 230V parameters are valid at 50Hz mains frequency.

may

A key word indicating flexibility of choice with no implied preference.

shall

A key word indicating a mandatory requirement.

shouldA key word indicating flexibility of choice with a strongly preferred implementation.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

1. INTENDED USEThis device is designed for installation in an enclosure and is intended for commercial use, such as in industrial control, process control,
monitoring, measurement equipment or the like.
Do not use this device in equipment, where malfunctioning may cause severe personal injury or threaten human life without additional
appropriate safety devices, that are suited for the end-application.
If this device is used in a manner outside of its specification, the protection provided by the device may be impaired.

2. INSTALLATION INSTRUCTIONSWARNING

Risk of electrical shock, fire, personal injury or death.

- Turn power off before working on the device and protect against inadvertent re-powering.
- Do not open, modify or repair the device.
- Use caution to prevent any foreign objects from entering into the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
- Do not touch during power-on, and immediately after power-off. Hot surface may cause burns.
Obey the following installation instructions:This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to the factory for
inspection.
Install the device in an enclosure providing protection against electrical, mechanical and fire hazards.
Install the device onto a DIN rail according to EN 60715 with the input terminals on the bottom of the device. Other mounting
orientations require a reduction in output current.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that are designed for aminimum operating temperature of 60°C for ambient temperatures up to +45°C, 75°C for ambient temperatures up to +60°C and 90°C
for ambient temperatures up to +70°C.
Ensure that all strands of a stranded wire enter the terminal connection. Use ferrules for wires on the input terminals. Unused screw
terminals should be securely tightened.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The enclosure of the device provides a degree of protection of IP20. The enclosure does not provide protection against spilled liquids.
The device is designed for overvoltage category II zones. Below 2000m altitude the device is tested for impulse withstand voltages up to
4kV, which corresponds to OVC III according to IEC 60664-1.
The device is designed as “Class of Protection I” equipment according to IEC 61140. Do not use without a proper PE (Protective Earth)connection.
The device is suitable to be supplied from TN, TT or IT mains networks. The continuous voltage between the input terminals and the PE
potential must not exceed 264Vac.
A disconnecting means shall be provided for the input of the device.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do not cover ventilation
grid!
The device is designed for altitudes up to 5000m. Above 2000m a reduction in output current is required.
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side. Increase the 5mm to15mm in case the adjacent device is a heat source. When the device is permanently loaded with less than 50%, the 5mm can be reduced
to zero.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

The device is designed, tested and approved for branch circuits up to 32A (IEC) and 30A (UL) without additional protection device. If an
external fuse is utilized, do not use circuit breakers smaller than 10A B- or C-Characteristic to avoid a nuisance tripping of the circuit
breaker.
The maximum surrounding air temperature is +70°C. The operational temperature is the same as the ambient or surrounding air
temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.
Installation Instructions for Hazardous Location Areas
The device is suitable for use in Class I Division 2 Groups A, B, C, D locations and for use in Group II Category 3 (Zone 2) environments.
Classification: ATEX: EPS 13 ATEX 1 555 X, II 3G Ex ec nC IIC T3 Gc / IECEx EPS 13.0016X
WARNING EXPLOSION HAZARDS!
Substitution of components may impair suitability for this environment.
Do not disconnect the device or operate the voltage adjustment unless power has been switched off or the area is known to be nonhazardous.
A suitable enclosure must be provided for the end product which has a minimum protection of IP54 and fulfils the requirements of the
EN 60079-0.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

3. AC-INPUT
AC input
AC input range

nom.

Allowed voltage L or N to earth
Input frequency
Turn-on voltage
Shut-down voltage

max.
nom.
typ.
typ.
typ.
typ.

External input protection

See recommendations in chapter 23.3.

Input current

typ.

Power factor*)
Crest factor**)Start-up delay
Rise timeTurn-on overshootAC 100-240V
85-264Vac
264-300Vac
300Vac50–60Hz
84Vac
33Vac
45Vac
62Vac

suitable for TN-, TT- and IT mains networks
no damage between 0 and 85Vac< 500ms
continuous, IEC 62103±6%
steady-state value, see Fig. 3-1
steady-state value at 7.5A load, see Fig. 3-1
steady-state value at 15A load, see Fig. 3-1
steady-state value at 30A load, see Fig. 3-1

typ.
typ.
typ.
typ.

AC 100V
4.0A
4.4A
0.99
1.5
900ms
72ms

AC 120V
3.3A
3.7A
0.99
1.5
850ms
72ms

AC 230V
1.8A
2.0A
0.95
1.65
700ms
72ms

typ.

120ms

120ms

120ms

max.

200mV

200mV

200mV

at 12V, 30A, see Fig. 3-3
at 15V, 27A
at 12V, 30A, see Fig. 3-4
at 12V, 30A
see Fig. 3-2
at 12V, 30A const. current load,
0mF load capacitance, see Fig. 3-2
at 12V, 30A const. current load,
30mF load capacitance, see Fig. 3-2
see Fig. 3-2*) The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.
**) The crest factor is the mathematical ratio of the peak value to RMS value of the input current waveform.

Rated
input range

max.
500ms

Turn-onShut -dow n

POUT

Fig. 3-2 Turn-on behavior, definitions

OutputVoltage

VIN
85V

Input
Voltage- 5%
Start-up
delay

Rise
Time

OvershootFig. 3-1 Input voltage range

264V 300Vac

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

Fig. 3-3 Input current vs. output load at 12V

Fig. 3-4 Power factor vs. output load at 12V
Power Factor, typ.

Input Current, typ.

5Aa) 100Vacb) 120Vacc) 230Vac

4
3

a
b

1.0

a, b

0.95

c

0.9

2

a) 100Vacb) 120Vacc) 230Vac

0.85

c

1

0.8

0
0

3

6

0.75

9 12 15 18 21 24 27 30A

0

3

6

9 12 15 18 21 24 27 30A
Output Current at 12V

Output Current at 12V

4. DC-INPUT
Do not operate this power supply with DC-input voltage.

5. INPUT INRUSH CURRENT
An active inrush limitation circuit limits the input inrush current after turn-on of the input voltage.
The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.

Inrush current

AC 100V
13Apeak
11Apeak
2A2s

max.
typ.
max.

Inrush energy

AC 120V
13Apeak
9Apeak
2.5A2s

AC 230V
13Apeak
7Apeak
0.5A2stemperature independent
temperature independent
temperature independentFig. 5-1 Typical input inrush current behaviour at
nominal load and 25°C ambient

Input Current 5A / DIV

Input

230Vac12Vdc
Output

100mS/DIV

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

6. OUTPUT
Output voltage
Adjustment range

max.
typ.
typ.
typ.
max.
max.

12V
12-15V
16.5V*)
12.0V
12.0V
12.5V
10mV
100mV

typ.

500mV

Ripple and noise voltage
Output current

max.
nom.
nom.
typ.

100mVpp
30A
27A
120A

Output power

nom.
nom.

min.
max.
max.

360W
405W
cont. current
HiccupPLUS mode**)35A***)
42A***)
12.6A***)

min.
typ.
typ.

120A
130A
5 600µF

Factory settings

Line regulation
Load regulationnom.

Overload behaviour
Short-circuit current

Output capacitance
*)
**)

***)

guaranteed
at clockwise end position of potentiometer±0.2%, at full load, cold unit, in “single use” mode
±0.2%, at full load, cold unit, in “parallel use” modeat no load, cold unit, in “parallel use” mode
85-300Vac
in “single use” mode: static value, 0A → 30A;
see Fig. 6-1
in “parallel use” mode: static value, 0A → 30A,
see Fig. 6-2
20Hz to 20MHz, 50Ohm
at 12V, see Fig. 6-1
at 15V, see Fig. 6-1
up to 15ms, output voltage stays above 10V, see Fig. 6-4, This
peak current is available once every five seconds. See chapter
23.1 for more peak current measurements.
at 12V
at 15Voutput voltage > 6Vdc, see Fig. 6-1
output voltage < 6Vdc, see Fig. 6-1
load impedance <10mOhm, see Fig. 6-3
load impedance <10mOhm, see Fig. 6-3
average (R.M.S.) current, load impedance 25mOhm, see Fig.
6-3
up to 15ms, load impedance <10mOhm, see Fig. 6-4
up to 15ms, load impedance <10mOhm, see Fig. 6-4
included inside the power supply

This is the maximum output voltage which can occur at the clockwise end position of the potentiometer due to tolerances. It is not guaranteed value
which can be achieved. The typical value is about 15.8V (in “single use” mode).
HiccupPLUS ModeAt heavy overloads (when output voltage falls below 6V), the power supply delivers continuous output current for 2s. After this, the output is switched off
for approx. 18s before a new start attempt is automatically performed. This cycle is repeated as long as the overload exists. If the overload has beencleared, the device will operate normally. See Fig. 6-3.
Discharge current of output capacitors is not included.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

7/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

Fig. 6-1 Output voltage vs. output current, typ.

Output Voltage (Single Use, typ.)

16V
14
12
10
8
6
4
2
0

Fig. 6-2 Output voltage in “parallel use” mode, typ.

Output Voltage (Parallel Use, typ.)Adjustment
Range

Adjustment
Range

16V

Continuous
current

15V
14V

Factory
setting

13V
12V
10V
9V

Output Current

0

Factory setting

11V

Hiccupmode

Output Current

0

5 10 15 20 25 30 35 40 45 50A

Fig. 6-3 Short-circuit on output, HiccupPLUS mode, typ.

5

10

15

20

25

30A

Fig. 6-4 Dynamic overcurrent capability, typ.
Output Voltage (dynamic behavior, < 15ms)

OutputCurrent
Normaloperation

Normaloperation

Short -circuit

40A

t

0
2s

18s

2s

18s

2s

18s

16V
14
12
10
8
6
4
2
0

Adjustment
Range

Output Current

0 15 30 45 60 75 90 105120135150A

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

8/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

7. HOLD-UP TIME
Hold-up TimeAC 100V
80ms
67ms
35ms
29ms

typ.
min.
typ.
min.
Fig. 7-1 Hold-up time vs. input voltage

Hold-up Time

80ms
70
60
50
40
30
20
10
0
90

AC 120V
80ms
67ms
35ms
29ms

AC 230V
80ms
67ms
35ms
29ms

at 12V, 15A, see Fig. 7-1
at 12V, 15A, see Fig. 7-1
at 12V, 30A, see Fig. 7-1
at 12V, 30A, see Fig. 7-1

Fig. 7-2 Shut-down behavior, definitions

12V, 15A, typ.
12V, 15A, min.

Zero Transition
Input
Voltage

12V, 30A, typ.
12V, 30A, min.

Hold-up Time

Input Voltage

120

155

- 5%

OutputVoltage190

230Vac8. DC-OK RELAY CONTACT
This feature monitors the output voltage, which is produced by the power supply itself. It is independent of a back-fed voltage from aunit connected in parallel to the power supply output.
Contact closes
Contact opens

As soon as the output voltage reaches 90% of the adjusted output voltage level.
As soon as the output voltage dips more than 10% below the adjusted output voltage.
Short dips will be extended to a signal length of 100ms. Dips shorter than 1ms will be ignored.
max.
60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A
resistive loadmin.
1mA at 5Vdc
min. permissible load
See dielectric strength table in chapter 18.

Contact ratings
Isolation voltage

Fig. 8-1 DC-OK relay contact behavior

VOUT = VADJ
10%

<
1ms

open

closed>1ms

0.9* VADJ

100ms

open

closedOct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

9. EFFICIENCY AND POWER LOSSES
Efficiency
Average efficiency*)

typ.
typ.

AC 100V
90.9%
90.0%

Power losses

typ.
typ.
typ.

6.8W
19.1W
36.0W

*)

AC 120V
91.4%
90.5%

AC 230V
92.6%
91.6%

5.2W
18.1W
33.9W

3.0W
15.5W
28.8W

at 12V, 30A
25% at 7.5A, 25% at 15A,
25% at 22.5A. 25% at 30A
at 12V, 0A
at 12V, 15A
at 12V, 30A

The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25% of the time, 50% of
the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100% of the nominal load for the rest of thetime.

Fig. 9-1 Efficiency vs. output current at 12V, typ.

Fig. 9-2 Losses vs. output current at 12V, typ.

Efficiency

Power Losses

93%

c
b
a

91
89
87

a) 100Vacb) 120Vacc) 230Vac

85
83

Output Current

81
0

5

10

15

20

25

40W
35
30
25
20
15
10
5
0

a
b
c

a) 100Vacb) 120Vacc) 230Vac
Output Current

0

30A

5

10

15

20

25

Fig. 9-3 Efficiency vs. input voltage at 12V, 30A, typ.

Fig. 9-4 Losses vs. input voltage at 12V, 30A, typ.

Efficiency

Power Losses

95%

40W

94

35

93

30

92

25

91

20

30A

15

90
Input Voltage

89
100 120180

230 264Vac

Input Voltage

10
100 120180

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

230 264Vac

10/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

10. LIFETIME EXPECTANCY AND MTBF
Lifetime expectancy*)

MTBF **) SN 29500, IEC 61709
MTBF **) MIL HDBK 217F

AC 100V
168 000h*)
475 000h*)
50 000h
141 000h*)
413 000h
702 000h
253 000h

AC 120V
170 000h*)
481 000h*)
50 000h
141 000h*)
428 000h
728 000h
259 000h

AC 230V
174 000h*)
492 000h*)
54 000h
153 000h*)
554 000h
776 000h
278 000h

353 000h

358 000h

380 000h

61 000h62 000h68 000h82 000h

83 000h

91 000hat 12V, 15A and +40°C
at 12V, 15A and +25°C
at 12V, 30A and +40°C
at 12V, 30A and +25°C
at 12V, 30A and +40°C
at 12V, 30A and +25°C
at 12V, 30A and +40°C;
Ground Benign GB40
at 12V, 30A and +25°C;
Ground Benign GB25
at 12V, 30A and +40°C;
Ground Fixed GF40
at 12V, 30A and +25°C;
Ground Fixed GF25*)

The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime expectancy of the built-in
electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the capacitor’s manufacturer specification. The
manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years (131 400h). Any number exceeding this value is a calculated
theoretical lifetime which can be used to compare devices.
**) MTBF stands for Mean Time Between Failures, which is calculated according to statistical device failures, and indicates reliability of a device. It is the statisticalrepresentation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that statistically one unit will failevery 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit has been running for 50 000h or only for 100h.

11. FUNCTIONAL DIAGRAM
Fig. 11-1 Functional diagram

L
N

Input Fuse
Input Filter
Input Rectifier
Active Inrush Limiter

PFC
ConverterPower
Converter

OutputFilterOutputVoltage
Regulator
Temperature
Shutdown

OutputPower
Manager

OutputOverVoltage
Protection

OutputVoltage
Monitor++Single /Parallel

VOUT
DC-ok
LED

DC-ok
Relay

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

DC-okContact

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C-Series

12. TERMINALS AND WIRING
The terminals are IP20 Finger safe constructed and suitable for field- and factory wiring.
Input and output
screw terminals
0.5-6mm2
0.5-4mm2
AWG20-10
2.8mm (including ferrules)
7mm
3.5mm slotted or cross-head No 2
1Nm

Type
Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter
Wire stripping length
Screwdriver
Recommended tightening torque

DC-OK-Signal
spring-clamp terminals
0.15-1.5mm2
0.15-1.5mm2
AWG26-14
1.5mm (including ferrules)
7mm
3.5mm slotted (to open the spring)
not applicable

Instructions:a) Use appropriate copper cables that are designed for minimum operating temperatures of:
60°C for ambient up to 45°C and
75°C for ambient up to 60°C minimum
90°C for ambient up to 70°C minimum.
b) Follow national installation codes and installation regulations!
c) Ensure that all strands of a stranded wire enter the terminal connection!
d) Do not use the unit without PE connection.
e) Unused terminal compartments should be securely tightened.
f) Ferrules are allowed.
Daisy chaining:
Daisy chaining (jumping from one power supply output to the next) is allowed as long as the average output current through one
terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal block as shown in Fig. 12-2.
Fig. 12-1 Daisy chaining of outputs

Power
Supply+ + Output-

Fig. 12-2 Using distribution terminals

Distribution
Terminals

Power
Supply+ + --Output

Load
+

-

Power
SupplyPower
Supply

+ + -

+ +-

-

Output-OutputLoad+-max 25A!
continuous

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

13. FRONT SIDE AND USER ELEMENTS
Fig. 13-1 Front sideA

Input Terminals (screw terminals)
N, LLine input
PE (Protective Earth) input

B

Output Terminals (screw terminals, two pins per pole)+
Positive output–
Negative (return) output

C

Output voltage potentiometer
Open the flap to adjust the output voltage. Factory set: 12.0V

D

DC-OK LED (green)
On, when the output voltage is >90% of the adjusted output voltage

E

DC-OK Relay Contact (quick-connect spring-clamp terminals)
The DC-OK relay contact is synchronized with the DC-OK LED.
See chapter 8 for details.

F“Parallel Use” “Single Use” selector
Set jumper to “Parallel Use” when power supplies are connected in parallel to increase
the output power. In order to achieve a sharing of the load current between theindividual power supplies, the “parallel use” regulates the output voltage in such amanner that the voltage at no load is approx. 4% higher than at nominal load. See also
chapter 23.5. A missing jumper is equal to a “Single Use” mode.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

14. EMCThe power supply is suitable for applications in industrial environment as well as in residential, commercial and light industry
environment without any restrictions. A detailed EMC report is available on request.
EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)

Surge voltage on input
Surge voltage on output
Surge voltage on DC-OK
Conducted disturbance
Mains voltage dips

Voltage interruptions
Voltage sags

Powerful transients

According generic standards: EN 61000-6-1 and EN 61000-6-2
contact discharge
8kV
EN 61000-4-2
air discharge
15kV
EN 61000-4-3
80MHz-2.7GHz
20V/m
EN 61000-4-4
input lines
4kV
output lines
2kV
DC-OK signal (coupling clamp)
2kV
EN 61000-4-5
L→N
2kV
L → PE, N → PE
4kV
EN 61000-4-5+→1kV+ / - → PE
2kV
EN 61000-4-5
DC-OK signal → PE
1kV
EN 61000-4-6
0.15-80MHz
20V
EN 61000-4-11
0% of 100Vac
0Vac, 20ms
40% of 100Vac
40Vac, 200ms
70% of 100Vac
70Vac, 500ms
0% of 200Vac
0Vac, 20ms
40% of 200Vac
80Vac, 200ms
70% of 200Vac
140Vac, 500ms
EN 61000-4-11
0% of 200Vac (=0V)
5000msSEMI F47
dips on the input voltage according to SEMI F47 standard
80% of 120Vac (96Vac)
1000ms70% of 120Vac (84Vac)
500ms
50% of 120Vac (60Vac)
200ms
VDE 0160
over entire load range
750V, 1.3ms

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion C
Criterion A
Criterion A
Criterion A
Criterion A
Criterion C
Criterion A
Criterion A
Criterion A
Criterion A

Criterions:
A: Power supply shows normal operation behavior within the defined limits.
C: Temporary loss of function is possible. Power supply may shut-down and restarts by itself. No damage or hazards for the power supply will occur.

EMC Emission
According generic standards: EN 61000-6-3 and EN 61000-6-4
Conducted emission
EN 55011, EN 55032, FCC Part 15, CISPR 11, CISPR 32
Class B
input lines
Conducted emission
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
limits for DC power port acc. EN
output lines**)
61000-6-3 not fulfilled ***)
Radiated emission
EN 55011, EN 55032
Class B
Harmonic input current
EN 61000-3-2
fulfilled for class A equipment
Voltage fluctuations, flicker
EN 61000-3-3
fulfilled*)
This device complies with FCC Part 15 rules.
Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
*) tested with constant current loads, non pulsing**) for information only, not mandatory for EN 61000-6-3***) Quasi-peak values fulfilled, average values +5dB

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

Switching Frequencies
Switching frequency 1
Switching frequency 2

The power supply has two converters with two different switching frequencies included.
70kHz to 140kHz
PFC converter, input voltage and output power dependent
80kHz to 150kHz
Main converter, output power dependent

15. ENVIRONMENT
Operational temperature*)
Storage temperature
Output derating
Humidity **)Vibration sinusoidal-25°C to +70°C-40 to +85°C
0.75A/°C
5 to 95% r.h.
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g***)2 hours / axis
30g 6ms, 20g 11ms***)3 bumps / direction, 18 bumps in total
0 to 2000m
2000 to 5000m

Shock
Altitudereduce output power according Fig. 15-1
for storage and transportation
60-70°C
IEC 60068-2-30
IEC 60068-2-6
IEC 60068-2-27

without any restrictions
reduce output power or ambient temperature,
see Fig. 15-2
IEC 62103, EN 50178, overvoltage category II
30W/1000m or 5°C/1000m> 2000m, see Fig. 15-2
III
IEC 62103, EN 50178, altitudes up to 2000m
II
altitudes from 2000m to 5000m
2
IEC 62103, EN 50178, not conductive
At load currents below 4A some audible noise will be emitted from the power supply

Altitude derating
Over-voltage category
Degree of pollution
Audible noise*) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
**) Do not energize while condensation is present***) Tested in combination with DIN rails according to EN 60715 with a height of 15mm and a thickness of 1.3mm and standard orientation. Higher levels allowed
when using the wall mounting bracket ZM2.WALL

Fig. 15-1 Output current vs. ambient temp.

Fig. 15-2 Output current vs. altitude
Al lowed Output Current at 12V

Allowed Output Current at 12V

30A

A B

25A

30A
25

20A

20

15A

15

10A
5A
0
-25

10

A...100 to 264Vac, continuous
B... short term

0

20

5

40 50 60 70°C

Ambient Temperature

0
0

2000

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

4000

5000m
Al titude

15/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

16. PROTECTION FEATURES
Output protection
Output over-voltage protection

Degree of protection

Penetration protection
Over-temperature protection
Input transient protection
Internal input fuse*)

Electronically protected against overload, no-load and short-circuits*)
typ. 17.3Vdc
In case of an internal power supply defect, a redundant circuit
max. 18Vdc
limits the maximum output voltage. The output shuts down andautomatically attempts to restart.
IP20
EN/IEC 60529
Caution: For use in a controlled environment according to CSA
22.2 No 107.1-01.
> 5mm
e.g. screws, small partsyes
Output shut-down with automatic restart
MOV (Metal Oxide Varistor)
included
not user replaceable

In case of a protection event, audible noise may occur.

17. SAFETY FEATURES
Input / output separation*)

Class of protection
Isolation resistancePE resistance
Touch current (leakage current)

*)

SELV
IEC/EN 60950-1
PELV
IEC/EN 60204-1, EN 50178, IEC 62103, IEC 60364-4-41
double or reinforced insulation
I
PE (Protective Earth) connection required> 5MOhm
input to output, 500Vdc< 0.1Ohm
typ. 0.14mA / 0.37mA
100Vac, 50Hz, TN-,TT-mains / IT-mains
typ. 0.20mA / 0.55mA
120Vac, 60Hz, TN-,TT-mains / IT-mains
typ. 0.35mA / 0.87mA
230Vac, 50Hz, TN-,TT-mains / IT-mains
max. 0.17mA / 0.46mA
110Vac, 50Hz, TN-,TT-mains / IT-mains
max. 0.26mA / 0.67mA
132Vac, 60Hz, TN-,TT-mains / IT-mains
max. 0.46mA / 1.08mA
264Vac, 50Hz, TN-,TT-mains / IT-mains

double or reinforced insulation

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

16/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

18. DIELECTRIC STRENGTH
The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by the manufacturer.
Field tests may be conducted in the field using the appropriate test equipment which applies the voltage with a slow ramp (2s up and 2sdown). Connect all input-terminals together as well as all output poles before conducting the test. When testing, set the cut-off current
settings to the value in the table below.
Type test

60s

A
2500Vac

B
3000Vac

C
1000Vac

D
500VacFactory test

5s

2500Vac

2500Vac

500Vac

500VacField test

5s

2000Vac

2000Vac

500Vac

500VacCut-off current setting> 15mA> 15mA> 20mA> 1mA

Fig. 18-1 Dielectric strength

Input

DC-ok
B*)

L
N

B

A

D
OutputEarth, PEC+-

To fulfil the PELV requirements according to EN60204-1 § 6.4.1, werecommend that either the + pole, the – pole or any other part of the output
circuit shall be connected to the protective earth system. This helps to avoid
situations in which a load starts unexpectedly or can not be switched off
when unnoticed earth faults occur.

B*) When testing input to DC-OK ensure that the max. voltage between DC-OK and the output is not exceeded (column D). We recommend connecting DC-OK
pins and the output pins together when performing the test.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

17/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

19. APPROVED, FULFILLED OR TESTED STANDARDSUL 508

IEC 61010-2-201

IEC 60950-1
UL 60950-1

ATEX

IECEx

Class I Div 2

Marine (DNV)

Marine (ABS)IEC 60068-2-60

UL Certificate
Listed equipment for category NMTR - Industrial Control Equipment
Applicable for US and Canada
E-File: E198865
Manufacturer's Declaration
Electrical Equipment for Measurement, Control and Laboratory Use Particular requirements for control equipment
CB Scheme Certificate
General safety requirements for Information Technology Equipment (ITE)UL Certificate
Recognized component for category QQGQ - Information Technology
Equipment (ITE)
Applicable for US and Canada
E-File: E137006
Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General requirements
EN 60079-7, EN 60079-15 Equipment protection by type of protection"e" and "n"Certificate: EPS 15 ATEX 1 555 X
Temperature Code: T3
Type of Protection: ec nC
IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-7, IEC 60079-15 Equipment protection by type of protection"e" and "n"Certificate: IECEx EPS 13.0016X
Type of Protection: ec nC
CSA Certificate
Power Supplies for Hazardous Location
Applicable for Canada and US
CSA Class: 5318-01 (Canada), 5318-81 (USA)
Temperature Code: T3
Groups: A, B, C and D
DNV Certificate
DNV Type approved product
Certificate: TAA00002A7
ABS Design Assessment Certificate
ABS (American Bureau of Shipment) assessed product
Certificate: 22-2231447-PDA

Manufacturer's Declaration (Online Document)
Environmental Tests, Flowing Mixed Gas Corrosion Test
IEC 60068-2-60 Method 4
Test Ke - Method 4
H2S: 10ppb
NO2: 200ppb
Cl2: 10ppb
SO2: 200ppb
Test Duration: 3 weeks, this simulates a service life of 10 years.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

18/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

ISA-71.04 G3

Manufacturer's Declaration (Online Document)
Airborne Contaminants Corrosion Test
ISA-71.04 G3
Severity Level: G3 Harsh
H2S: 100ppb
NOx: 1250ppb
Cl2: 20ppb
SO2: 300ppb
Test Duration: 3 weeks, this simulates a service life of 10 years.
Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364-C1-L/W for
solvents and water-based paints

Labs

20. REGULATORY PRODUCT COMPLIANCE
EU Declaration of Conformity

REACH Regulation (EU)

WEEE Directive

CCC

KC

The CE mark indicates conformance with the- EMC directive- ATEX directive- RoHS directive
Manufacturer's Declaration
EU regulation regarding the Registration, Evaluation, Authorisation andRestriction of Chemicals (REACH) fulfilled.
EU Regulation (EC) 1907/2006.
Manufacturer's Statement
EU-Regulation on Waste Electrical and Electronic Equipment (WEEE)
registered in Germany as business to business (B2B) products.
WEEE Reg.-Nr. DE 55837529
CCC Certificate
China Compulsory Certification (CNCA-C23-01:2019)
Certificate for devices made in Suzhou/China (PULS Electronics):
2022122303114927
Certificate for devices made in Chomutov/Czech Republic (PULS
investiční): 2022122303114926
CCC-ExKC Korean Certification
Korean - Registration of Broadcasting and Communication Equipment
Registered under Clause3, Article 58-2 of Radio Waves Act.
Registration No. R-R-PUG-CPS20.121.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

19/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

21. PHYSICAL DIMENSIONS AND WEIGHT
WeightDIN rail

Installation Clearances

1000g
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN rail depth must be added to the unit depth (127mm) to calculate the total required installation
depth.
See chapter 2.

Fig. 21-1 Front viewFig. 21-2 Side viewOct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

20/28

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12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

22. ACCESSORIES
22.1. ZM2.WALL - WALL MOUNTING BRACKETThis bracket is used to mount the power
supply onto a flat surface without utilizing a DIN rail.

Due to the small size of the unit, it is required that the black-DIN rail slide on the back of the unit must be removed. Instructions how to
do this can be found in the manual of the ZM2.WALL.

22.2. ZM13.SIDE - SIDE MOUNTING BRACKETThis bracket is used to mount DIMENSION units sideways with or without utilizing a DIN rail. The two aluminum brackets and the black
plastic slider of the unit have to be detached, so that the steel brackets can be mounted.
For sideway DIN rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on the steel bracket.

Side mounting with DIN rail brackets

Side mounting without DIN rail brackets

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

21/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series22.3. YR80.242 - REDUNDANCY MODULES(2x 40A Inputs, 1x 80A output)
The YR80.242 is the preferred redundancy module for the CPS20.121 power supply. It is equippedwith two input channels, which are individually decoupled by utilizing mosfet technology. Using
mosfets instead of diodes reduces the heat generation and the voltage drop between input andoutput. The YR80.242 does not require an additional auxiliary voltage and is self- powered even incase of a short circuit across the output.
Due to the low power losses, the unit is very slender and only requires 46mm width on the DIN rail.

22.4. YR40.245 - REDUNDANCY MODULES(1x 40A input, 1x 40A output)
The YR40.245 is a 40A single channel redundancy module, which is equipped with a plug connector on
the output. The plug connector allows replacing the power supply or the redundancy module while
the system is running. The plug connector avoids that the output wires can touch and short the load
circuit.
The YR40.245 is very slender and only requires 46mm width on the DIN rail. It also utilizes mosfet
technology instead of diodes for low heat generation and a minimal voltage drop between input andoutput. It does not require an additional auxiliary voltage and is self-powered even in case of a shortcircuit across the output.

Fig. 22-1 Typical 1+1 Redundant configuration for 30A witha dual redundancy module
12V
30A
Load

CPS20.121
12-15V 30A
Power
SupplyACInput

L N PE

I

L
N
PE

Output12V 30A

+ + -

-

Input
1

CPS20.121
12-15V 30A
Power
SupplyCPS20.121
12-15V 30A
Power
SupplyOutputInput
2

ACInput

L N PEI

Output12V 30A+ + -ACInput-

L N PE* ) YR80.241

OutputYR40.245
Redundancy
ModuleOutput12V 30A+ + --ACInput-

L N PE-+

OutputYR40.245
Redundancy
Module

DCOK

Input

+

I

also possible

CPS20.121
12-15V 30A
Power
Supply

-

+

DCOK

DCOK

+ - + -

12V
30A
Load

FailureMonitorFailureMonitorYR80.242* )Redundancy
ModuleDCOK

Fig. 22-2 Typical N+1 or 1+1 Redundant configuration for 30A with multiple YR40.245
redundancy modules

Output12V 30A

+ + -

-

Input

+

-

I

L
N
PE

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

22/28

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12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

23. APPLICATION NOTES
23.1. PEAK CURRENT CAPABILITY
The power supply can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents.
This helps to start current demanding loads. Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up
coil. The inrush current demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal
output current (including the PowerBoost). The same situation applies when starting a capacitive load.
The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load branches are often
individually protected with circuit breakers or fuses. In case of a short or an overload in one branch circuit, the fuse or circuit breakerneed a certain amount of over-current to open in a timely manner. This avoids voltage loss in adjacent circuits.
The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of the power supply.
The capacitors get discharged during such an event, which causes a voltage dip on the output. The following two examples show typicalvoltage dips:
Fig. 23-1 Peak load with 2x the nominal current for 50ms,
typ.

OutputVoltage

12V

Fig. 23-2 Peak load with 5x the nominal current for 5ms,
typ.

OutputVoltage

12V

7.8V

9.4V

6.8V

60A

150A

OutputCurrent

0A

1ms/DIV

10ms/DIV

60A Peak load (resistive) for 50ms
Output voltage dips from 12V to 7.8V.
Peak current voltage dips

OutputCurrent

0A

typ.
typ.
typ.

150A Peak load (resistive) for 5ms
Output voltage dips from 12V to 9.4V.
from 12V to 7.8V
from 12V to 9.0V
from 12V to 9.4V

at 60A for 50ms, resistive load
at 150A for 2ms, resistive load
at 150A for 5ms, resistive load

23.2. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called return voltage
immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply. It does not matter
whether the power supply is on or off.
The maximum allowed feed-back-voltage is 16Vdc. The absorbing energy can be calculated according to the built-in large sized output
capacitor which is specified in chapter 6.

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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12V, 30A, 360W, SINGLE PHASE INPUT

C-Series23.3. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 30A (UL) and 32A (IEC). An external protection is only required if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local regulations might
apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of the circuit
breaker. A minimum value of 10A B- or C-Characteristic breaker should be used.

23.4. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCB’s or UL 1077 circuit breakers) are commonly used for AC-supply systems and may also be usedon 12V branches.
MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to the wire sizethat is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.
To avoid voltage dips and under-voltage situations in adjacent 12V branches which are supplied by the same source, a fast (magnetic)
tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to the ride-through time of PLC's. Thisrequires power supplies with high current reserves and large output capacitors. Furthermore, the impedance of the faulty branch mustbe sufficiently small in order for the current to actually flow. The best current reserve in the power supply does not help if Ohm’s law
does not permit current flow. The following table has typical test results showing which B- and C-Characteristic MCBs magnetically trip
depending on the wire cross chapter and wire length.
Maximal wire length*) for a fast (magnetic) tripping:
0.75mm²
1.0mm²1.5mm²
C-3A
9m
12m
18m
C-4A
7m
10m
14m

Fig. 23-3 Test circuit

Power Supply

AC

MCB

+

+
Wire length

DC S1... Fault simulation switch

*)

Load

2.5mm²
26m
22m

C-6A
C-8A

4m
3m

6m
5m

10m
8m

14m
12m

C-10A

3m

4m

7m

10m

B-6A

8m

11m

14m

24m

B-10A
B-13A

5m
4m

7m
6m

10m
9m

17m
14m

B-16A

3m

5m

7m

11m

S1

-

Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series23.5. PARALLEL USE TO INCREASE OUTPUT POWER
CPS20.121 power supplies can be paralleled to increase the output power. The output voltage of all power supplies shall be adjusted tothe same value (±100mV) in “Single use” mode with the same load conditions on all units, or the units can be left with the factory
settings. After the adjustments, the jumper on the front of the unit shall be moved from
Unit A“Single use” to “Parallel use”, in order to achieve load sharing. The “Parallel use” modeAC+
regulates the output voltage in such a manner that the voltage at no load is approx. 4%
higher than at nominal load. See also chapter 6. If no jumper is plugged in, the unit is in
DC“Single use” mode. Factory setting is “Single use” mode.

+If more than three units are connected in parallel, a fuse or circuit breaker with a rating of
40A or 50A is required on each output. Alternatively, a diode or redundancy module canalso be utilized.

Unit BAC

Energize all units at the same time to avoid the overload HiccupPLUS mode. It also might be

DC

Load

+
-

-

necessary to cycle the input power (turn-off for at least five seconds), if the output was in
HiccupPLUS mode due to overload or short circuits and the required output current is higher than the current of one unit.
Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power supplies on top of eachother. Do not use power supplies in parallel in mounting orientations other than the standard mounting orientation (terminals onbottom of the unit) or in any other condition where a derating of the output current is required (e.g. altitude, above 60°C, …).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

23.6. PARALLEL USE FOR REDUNDANCYPower supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a certain amount of extra
power to support the load in case one power supply unit fails. The simplest way is to put two power supplies in parallel. This is called a
1+1 redundancy. In case one power supply unit fails, the other one is automatically able to support the load current without any
interruption. Redundant systems for a higher power demand are usually built in a N+1 method. E.g. five power supplies, each rated for
30A are paralleled to build a 120A redundant system. For N+1 redundancy the same restrictions apply as for increasing the output
power, see also chapter 23.5.
Please note: This simple way to build a redundant system does not cover failures
such as an internal short circuit in the secondary side of the power supply. In such acase, the defective unit becomes a load for the other power supplies and theoutput voltage can not be maintained any more. This can be avoided by utilizing
redundancy modules, which have decoupling devices (diodes or mosfets) included.
Further information and wiring configurations can be found in chapter 22.3.

12V
30A
Load

CPS20.121
12-15V 30A
Power
SupplyRecommendations for building redundant power systems:
a)
b)
c)
d)

ACInput

L N PE

OutputOutput12V 30A

+ + -

I

L
N
PE

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

CPS20.121
12-15V 30A
Power
SupplyYR80.242* )Redundancy
ModuleDCOK

Use separate input fuses for each power supply.
Set the power supply into “Parallel use” mode.
Monitor the individual power supply units. Therefore, use the DC-OK relay
contact of the CPS20 power supply.
It is desirable to set the output voltages of all units to the same value (±100mV) or leave it at the factory setting.

FailureMonitor

-

Input
1

DCOK

Input
2

ACInput+ - + -

L N PEI

Output12V 30A+ + --* ) YR80.241

also possible

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CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series

23.7. SERIES OPERATIONPower supplies of the same type can be connected in series for higher output voltages.
It is possible to connect as many units in series as needed, providing the sum of theoutput voltage does not exceed 150Vdc. Voltages with a potential above 60Vdc are not
SELV any more and can be dangerous. Such voltages must be installed with a protection
against touching.

Unit AAC

DC

Earthing of the output is required when the sum of the output voltage is above 60Vdc.

++

Unit B

Avoid return voltage (e.g. from a decelerating motor or battery) which is applied to the
output terminals.

AC

Keep an installation clearance of 15mm (left / right) between two power supplies andavoid installing the power supplies on top of each other. Do not use power supplies inseries in mounting orientations other than the standard mounting orientation (terminals
on bottom of the unit).

DC

Load

+
-

Earth
(see notes)

Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

23.8. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any kind of loads, including capacitive and inductive loads. If extreme large capacitors, such as EDLCs(electric double layer capacitors or “UltraCaps”) with a capacitance > 1.25F are connected to the output, the unit might charge thecapacitor in the HiccupPLUS mode (see chapter 6).

23.9. CHARGING OF BATTERIESThe power supply can be used to charge 12V lead-acid or maintenance free batteries.
Instructions for charging batteries:a)

Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge voltage.
End-of-charge voltage

13.9V

13.75V

13.6V

13.45V

Battery temperature

10°C

20°C

30°C

40°C

b)

Use a 40A or 50A circuit breaker (or blocking diode) between the power supply and the battery.

c)Ensure that the output current of the power supply is below the allowed charging current of the battery.

d)

The return current to the power supply (battery discharge current) is typ. 42mA when the power supply is switched off (except incase a blocking diode is utilized).

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

26/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series23.10. OPERATION ON TWO PHASESThe power supply can also be used on two-phases of a three-phase-system. Such a phase-to-phase connection is allowed as long as the
supplying voltage is below 240V+10%.
Power Supply
240V +10% max.

L1

L3

23.11. USE IN A TIGHTLY SEALED ENCLOSURE

AC
L
Fuse

L2

internal
fuse

N
PE
DC

When the power supply is installed in a tightly sealed enclosure, the temperature inside
the enclosure will be higher than outside. In such situations, the inside temperature defines the ambient temperature for the power
supply.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The power supply is placed in the middle of the box, no other heat producing items are inside the box
Enclosure:
Load:
Input:
Temperature inside enclosure:
Temperature outside enclosure:
Temperature rise:

Rittal Typ IP66 Box PK 9522 100, plastic, 254x180x165mm
12V, 24A; (=80%) load is placed outside the box
230Vac58.5°C (in the middle of the right side of the power supply with a distance of 2cm)
23.3°C
35.2K

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

27/28

CPS20.121
12V, 30A, 360W, SINGLE PHASE INPUT

C-Series23.12. MOUNTING ORIENTATIONSMounting orientations other than all terminals on the bottom require a reduction in continuous output power or a limitation in the
maximum allowed ambient temperature. The amount of reduction influences the lifetime expectancy of the power supply. Therefore,
two different derating curves for continuous operation can be found below:
Curve A1 Recommended output current.
Curve A2 Max allowed output current (results in approximately half the lifetime expectancy of A1).
Fig. 23-4
Mounting
Orientation A(Standardorientation)

Output Current

30A
25A
20A
15A
10A
5A

Power
SupplyINPUT OUTPUT

A1

Ambient Temperature

10
Fig. 23-5
Mounting
Orientation B(Upside down)

40

50

60°C

INPUT OUTPUT

30A
25A
20A
15A
10A
5A
10

A2
A1
Ambient Temperature

20

30

40

50

60°C

Pow er
SupplyOutput Current

30A
25A
20A
15A
10A
5A
10

A2
A1
Ambient Temperature

20

30

40

50

60°C

Output Current

30A
25A
20A
15A
10A
5A
10

Pow er
SupplyA2
A1
Ambient Temperature

20

30

40

50

60°C

INPUT OUTPUT

Output Current

Pow er
SupplyINPUT OUTPUT

Fig. 23-8
Mounting
Orientation E(Horizontal ccw)

30

Output Current

Fig. 23-6
Mounting
Orientation C(Table-top
mounting)

Fig. 23-7
Mounting
Orientation D(Horizontal cw)

20

30A
25A
20A
15A
10A
5A
10

A2
A1
Ambient Temperature

20

30

40

50

60°C

Oct. 2024 / Rev. 1.5 DS-CPS20.121-EN
All parameters are specified at 12V, 30A, 230Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

28/28