CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

REDUNDANCY POWER SUPPLY
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AC 100-240V wide-range input
Width only 48mm
Marine approvals, EMC Class B (bridge & deck)
Built-in decoupling MOSFET for 1+1 and N+1
redundancy
Efficiency up to 95.2%
20% output power reserves (PowerBoost)
Safe HiccupPLUS Overload Mode
Easy Fuse Breaking – 3 times nominal current for 12ms
Active power factor correction (PFC)
Full power between -40°C and +60°C
DC-OK relay contact
Current sharing feature included
3 Year Warranty

PRODUCT DESCRIPTIONSHORT-FORM DATAThe Dimension CP-Series are cost optimized power
supplies without compromising quality, reliability andperformance.
First of all, high immunity to transients and power surges
as well as low electromagnetic emission and Marine
approvals
with
EMC
Class
B
make
the
CP20.245-R2 the best choice for equipment in bridge &deck zones the same way as for oil, gas and chemicalplants.
This power supply furthermore features a DC-OK signal
contact to remotely monitor error-free operation, adecoupling MOSFET to set-up redundant power supply
systems, and plug connector terminals to allow device
replacement while the application keeps running. The
CP20.245-R2 covers an extreme wide temperature range
from -40°C up to +60°C providing full output power.
Outstanding features of CP20.245-R2 are its highefficiency, the electronic inrush current limitation, and an
active PFC. The devices also offer PowerBoost: Power
reserves of 20%, which may even be used continuously attemperatures up to +45°C. Additionally, the device candeliver about 3 times the nominal output current for
12ms which helps to trip fuses on faulty output branches.

Output voltage
Adjustment range
Output current

ORDER NUMBERS
Power Supply

MAIN APPROVALS
For details and the complete approval list, see chapter 20.

CP20.245-R2

Mechanical Accessory
ZM10.WALL

DC 24V23.8 - 25.2V
20A
Up to +60°C ambient
15A
At +70°C ambient
Derate linearly between +60°C and +70°C
PowerBoost
24A
Up to +45°C ambient
Linear decrease to nominal power
between +45°C and +60°C
Output ripple
max. 100mVpp 10Hz to 20MHz
AC Input voltage
AC 100-240V-15%/+10%
Mains frequency
50-60Hz±6%
AC Input current
4.28 / 2.25A
At 120 / 230Vac
Power factor
0.99 / 0.98
At 120 / 230Vac
AC Inrush current
10.0 / 4.5A
At 120 / 230Vac
Efficiency
93.8 / 95.2%
At 120 / 230Vac
Losses31.7 / 24.2W
At 120 / 230Vac
Temperature range -40°C to +70°C
Hold-up time
32ms
Size w x h x d
48x124x127mm Without DIN rail andplug connectors
Weight850g

Wall/Panel mount bracket

UL61010-2-201

ATEX

IECEx

MarineJul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-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 .......................................................8
8. DC-OK Relay Contact ..........................................99. Efficiency and Power Losses..............................10
10. Lifetime Expectancy and MTBF.........................11
11. Functional Diagram ...........................................11
12. Terminals and Wiring ........................................12
13. Replacing Units while the System is Running ..13
14. Front Side and User Elements ...........................14
15. EMC ....................................................................15
16. Environment ......................................................16
17. Protection Features ...........................................17
18. Safety Features ..................................................17
19. Dielectric Strength ............................................18Page
20. Approved, Fulfilled or Tested Standards ......... 19
21. Regulatory Product Compliance ...................... 20
22. Physical Dimensions and Weight ..................... 21
23. Accessories ........................................................ 2223.1. ZM10.WALL – Wall/Panel Mount Bracket 22
24. Application Notes ............................................. 23
24.1. Peak Current Capability ........................... 23
24.2. Adjustment of the Output Voltage ......... 24
24.3. Back-feeding Loads .................................. 25
24.4. External Input Protection ......................... 25
24.5. Output Circuit Breakers ............................ 25
24.6. Series Operation ....................................... 26
24.7. Parallel Use to Increase Output Power .... 26
24.8. Parallel Use for Redundancy .................... 27
24.9. Inductive and Capacitive Loads................ 28
24.10. Operation on Two Phases ........................ 28
24.11. Use in a Tightly Sealed Enclosure ............ 28
24.12. Mounting Orientations ............................ 29

The information given in this document is correct to the best of our knowledge and experience at the time of
publication. If not expressly agreed otherwise, this information does not represent a warranty in the legal sense of theword. As the state of our knowledge and experience is constantly changing, the information in this data sheet issubject to revision. We therefore kindly ask you to always use the latest issue of this document.
No part of this document may be reproduced or utilized in any form without our prior permission in writing.

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

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 withstandard 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.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
CP-Series

24V, 20A, SINGLE PHASE INPUT

1. INTENDED USEThis device is designed for installation in an enclosure and is intended for the general professional use such as in industrial
control, office, communication, and instrumentation equipment.
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 input power off before working on the device. Protect against inadvertent re-powering.
- Make sure that the wiring is correct by following all local and national codes.
- Do not modify or repair the unit.
- Do not open the unit as high voltages are present inside.
- Use caution to prevent any foreign objects from entering 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 surfaces 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 thefactory 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 aredesigned for a minimum 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. 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 ingress protection of IP20. The housing does not provide protection against
spilled liquids.
The isolation of the device is designed to withstand impulse voltages of overvoltage category III according to IEC 61010-2-201.
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 300Vac.
The input can also be powered from a battery or a similar DC source. The continuous voltage between the supply voltage and
the PE/ground potential must not exceed 375Vdc.
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 coverventilation grid!
The device is designed for altitudes up to 6000m. Above 2000m a reduction in output current and over voltage category is
required.
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side. Increase
the 5mm to 15mm 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.
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 nuisancetripping of the circuit breaker.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

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.
Do not unplug the connectors more often than 20 times in total.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-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
External input protection

AC 100-240V
Suitable for TN-, TT- and IT mains networks
85-264Vac
264-300Vac< 500msmax.
300VacContinuous, IEC 62477-1
nom.
50–60Hz
±6%
typ.
82Vac
Steady-state value, see Fig. 3-1
typ.
72Vac
Steady-state value, see Fig. 3-1
See recommendations in chapter 24.4.

Input current
Power factor*)
Crest factor**)Start-up delay
Rise time

typ.
typ.
typ.
typ.
typ.

AC 100V
5.17A
0.996
1.65
450ms
145ms

AC 120V
4.28A
0.996
1.63
420ms
145ms

AC 230V
2.25A
0.980
1.63
440ms
145ms

typ.

160ms

160ms

160ms

max.

1V

1V

1V

Turn-on overshootAt 20A, see Fig. 3-3
At 20A, see Fig. 3-4
At 20ASee Fig. 3-2
At 20A const. current load, 0mF
load capacitance, see Fig. 3-2
At 20A const. current load, 20mF
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.
Fig. 3-1 Input voltage range

Turn-onShut-down

Input
Voltage

max.
500ms

VIN
85V

Input Current, typ.

5a) 100Vacb) 120Vacc) 230Vac

4
3

Start-up
delay

Rise
Time

264V 300Vac

Fig. 3-3 Input current vs. output current

6A

- 5%

OutputVoltage

Overshoot

Rated
input range

POUT

Fig. 3-2 Turn-on behavior, definitions

Fig. 3-4 Power factor vs. output currentabPower Factor, typ.

1.0

a, b
c

0.95
0.9

c

2

a) 100Vacb) 120Vacc) 230Vac

0.85
0.8

1

Output Current

0
2

4

6

8 10 12 14 16 18 20 22 24A

0.75

Output Current

2

4

6

8 10 12 14 16 18 20 22 24A

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

4. DC-INPUT
DC input
DC input range
DC input current
Allowed Voltage L/N to Earth
Turn-on voltage
Shut-down voltage

nom.
typ.
max.
typ.
typ.

DC 110-150V
88-180Vdc
4.64A
375Vdc80Vdc
70Vdc

Fig. 4-1 Wiring for DC Input

Battery+

Power Supply
AC
L
N
PE

-

+
-

Load

±20%
At 110Vdc, at 20A
Continuous, IEC 62477-1
Steady state value
Steady state value

Instructions for DC use:a) Use a battery or a similar DC source. A supply from theintermediate DC-bus of a frequency converter is notrecommended and can cause a malfunction or damage
the unit.
b) Connect +pole to L and –pole to N.
c) Connect the PE terminal to an earth wire or to themachine ground.

DC

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
Inrush energy

max.
typ.
max.

AC 100V
15Apeak
12Apeak

AC 120V
12Apeak
10Apeaknegligible small

AC 230V
5.5Apeak
4.5ApeakTemperature independent
Temperature independentFig. 5-1 Typical input inrush current
behaviour at nominal load and 25°C ambient

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

6. OUTPUT
Output voltagenom.
DC 24V23.8 - 25.2V
The device is featured with a “soft output regulation characteristic” in order toachieve current share between multiple devices, when they are connected in parallel.
The “soft output regulation characteristic” regulates the output voltage in such amanner that the voltage at no load is approx. 4% higher than at nominal load.
See chapter 24.2
±0.2%, at 20A, cold unit (results to typ. 23.9V±0.2%
24.1V
at 24A and typ. 25.1V±0.2% at no load)
max.
10mV
85-300Vac
typ.
1000mV
Static value, 0A  20A; see Fig. 6-1
max.
100mVpp10Hz to 20MHz, 50Ohm
nom.
20A
Up to 60°C ambient temperature, see Fig. 16-1
nom.
15A
At 70°C ambient temperature, see Fig. 16-1
Derate linearly between +60°C to +70°C, see chapter 16nom.
24A
Up to 45°C ambient temperature, see Fig. 16-1
PowerBoost decreases linearly to nominal power between +45°C and +60°C, seechapter 16
Up to 12ms once every five seconds, see Fig. 6-3
typ.
60A
The output voltage stays above 20V. See chapter
24.1 for more peak current measurements.
Continuous
Output voltage > 13Vdc, see Fig. 6-1
current
HiccupPLUS® mode**) Output voltage < 13Vdc, see Fig. 6-1
min.
26A***)
Load impedance <10mOhm, see Fig. 6-1
max.
31A***)
Load impedance <10mOhm, see Fig. 6-1
Average (R.M.S.) current, load impedance 50mOhm,
max.
9.8A***)
see Fig. 6-2.
min.
55A
Up to 12ms, load impedance <10mOhm, see Fig. 6-3
typ.
70A
Up to 12ms, load impedance <10mOhm, see Fig. 6-3
typ.
8 000µF
Included inside the power supply

Adjustment range
Factory settings
Line regulation
Load regulation
Ripple and noise voltage
Output current

PowerBoost*)

Fuse breaking current

Overload behaviour

Short-circuit current

Output capacitance
*)

**)

***)

PowerBoost
This power/ current is continuously allowed up to an ambient temperature of 45°C.
Above 45°C, do not use this power/ current longer than a duty cycle of 10% and/ or not longer than 1 minute every 10 minutes.
HiccupPLUS® ModeAt heavy overloads (when output voltage falls below 13V), the power supply delivers continuous output current for 2s. After this, theoutput is switched off for approx. 18s before a new start attempt is automatically performed. This cycle is repeated as long as theoverload exists. If the overload has been cleared, the device will operate normally. See Fig. 6-2.
Discharge current of output capacitors is not included.
Fig. 6-1 Output voltage vs. output current, typ.

Fig. 6-2 Short-circuit on output, HiccupPLUS mode, typ.

Output Voltage

28V

Continuous
current

24

OutputCurrent

20

Normaloperation

Normaloperation

Short -circuit

29A

16
12
8

HiccupPLUS
mode

4
0

2s

Output Current

0

5

10

15

20

25

t

0

30

18s

2s

18s

2s

18s

35 40A

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

Fig. 6-3 Dynamic overcurrent capability, typ.
Output Voltage (dynamic behavior, < 12ms)

28V
24
20
16
12
8
4
0

Output Current

0

10

20

30

40

50

60

70A

7. HOLD-UP TIME
Hold-up Time

typ.
min.
typ.
min.

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

AC 100V
65ms
54ms
32ms
24ms

AC 120V
65ms
54ms
32ms
24ms

At 10A, see Fig. 7-1
At 10A, see Fig. 7-1
At 20A, see Fig. 7-1
At 20A, see Fig. 7-1

Fig. 7-2 Shut-down behavior, definitions

Hold-up Time

80ms
70
60
50
40
30
20
10
0

AC 230V
65ms
54ms
32ms
24ms

Zero Transition
10A, typ.
10A, min.

Input
Voltage

20A, typ.
20A, min.

Hold-up Time

Input Voltage

85

120

155

190

- 5%

OutputVoltage

230VacJul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

8. DC-OK RELAY CONTACT
This feature monitors the output voltage of the power supply in front of the decoupling device (see also chapter 11).
Contact closes
Contact opens
Contact ratings
Isolation voltage

As soon as the output voltage reaches typ. 22Vdc.
As soon as the output voltage dips below 22Vdc.
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 19.

Fig. 8-1 DC-ok relay contact behavior

22Vdc
<
1ms

open

closed

>
1ms

100ms

open

closedJul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/28

CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

9. EFFICIENCY AND POWER LOSSES
Efficiency
Average efficiency*)
Power losses

*)

typ.
typ.
typ.

AC 100V
93.2%
93.1%
92.8%

AC 120V
93.8%
93.7%
93.4%

AC 230V
95.2%
95.1%
94.6%

typ.
typ.
typ.
typ.

3.9W
17.4W
35.0W
42.7W

3.5W
16.4W
31.7W
38.7W

3.3W
13.8W
24.2W
29.7W

At 20AAt 24A (PowerBoost)
25% at 5A, 25% at 10A,
25% at 15A. 25% at 20A
At 0A
At 10AAt 20AAt 24A (PowerBoost)

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 the time.
Fig. 9-1 Efficiency vs. output current, typFig. 9-2 Losses vs. output current, typ.

Efficiency

Power Losses

96%
95
94
93
92
91
90
88
87

40W
35
30
25
20
15
10
5
0

(c)
(b)
(a)

(a) 100Vac(b) 120Vac(c) 230Vac

Output Current

4

6

(a)
(b)

(a) 100Vac(b) 120Vac(c) 230Vac(c)

Output Current

0 2 4 6 8 10 12 14 16 18 20 22 24A

8 10 12 14 16 18 20 22 24A

Fig. 9-3 Efficiency vs. input voltage at 20A,
typ.

Fig. 9-4 Losses vs. input voltage at 20A, typ.

Efficiency

Power Losses

96%

40W

95

35

94

30

93

25

92

20

91

15

90
85 100 120

Input Voltage

180

Input Voltage

10

230

264Vac85 100 120

180

230

264VacJul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

10/28

CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

10. LIFETIME EXPECTANCY AND MTBF
Lifetime expectancy*)

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

*)

**)

AC 100V
117 000h
331 000h*)
40 000h
114 000h
16 000h44 000h
387 000h
723 000h
164 000h

AC 120V
136 000h*)
386 000h*)
53 000h
150 000h*)
25 000h
69 000h
412 000h
768 000h
169 000h

AC 230V
164 000h*)
465 000h*)
90 000h
253 000h*)
47 000h
134 000h*)
543 000h
976 000h
199 000h

224 000h

231 000h

272 000h

34 000h36 000h42 000h45 000h47 000h56 000h

At 10A and 40°C
At 10A and 25°C
At 20A and 40°C
At 20A and 25°C
At 24A and 40°C
At 24A and 25°C
At 20A and 40°C
At 20A and 25°C
At 20A and 40°C;
Ground Benign GB40
At 20A and 25°C;
Ground Benign GB25
At 20A and 40°C;
Ground Fixed GF40
At 20A 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 adevice. It is the statistical representation 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 thatstatistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it cannot 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

Temperature
Shutdown

PFC
ConverterPower
Converter

OutputFilterDecoupling*)

OutputPower
Manager

OutputOverVoltage
Protection

OutputVoltage
Monitor

OutputVoltage
Regulator

+
DC-ok
LED

DC-ok
Relay

DC-ok
Contact

VOUT*) Decoupling utilizes a MOSFET

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 20A, SINGLE PHASE INPUT

CP-Series

12. TERMINALS AND WIRING
The terminals are IP20 Finger safe constructed and suitable for field- and factory wiring.
Type
Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter
Recommended tightening torque
Wire stripping length
Screwdriver

Input
plug connector withscrew termination
max. 4mm2
max. 2.5mm2
AWG 20-12
2.4mm(including ferrules)
max. 0.5Nm
7mm
3.5mm slotted or crosshead No 2

Outputplug connector withscrew termination
max. 6mm2
max. 6mm2
AWG 24-10
3.2mm(including ferrules)
max. 0.6Nm
12mm
3.5mm slotted or crosshead No 2

DC-OK-Signal
plug connector withscrew termination
max. 1.5mm2
max. 1.5mm2
AWG 26-14
1.8mm(including ferrules)
max. 0.8Nm
6mm
3.5mm slotted

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) Unused terminal compartments should be securely tightened.
e) Ferrules are allowed.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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24V, 20A, SINGLE PHASE INPUT

CP-Series

13. REPLACING UNITS WHILE THE SYSTEM IS RUNNING
Fig. 13-1 Replacing the power supply or redundancy module while the system is running

Load

3a

3b
-

+

Output 24V 20A

DC-OK

DC-OK

DCOK

DCOK

CP20.245-R2
Power Supply

L

-

+

Output 24V 20A

CP20.245-R2
Power Supply

Input
N PE

L

2a

2b

1a I

1b I

Input
N PE

L
N
PE

Instructions:-Switch-off circuit breaker (1a).

-Remove plug (2a).

-Remove plug (3a). The plug prevents the cables from shorting.

-

Change power supply.

-

Put the plug (3a) back in.

-

Put the plug (2a) back in.

-Turn-on the circuit breaker (1a).

-The circuit is redundant again.

To replace the right power supply or redundancy module, use the same procedure but turn off circuit breaker (1b) andremove plug / plug in (2b) and (3b).

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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24V, 20A, SINGLE PHASE INPUT

CP-Series

14. FRONT SIDE AND USER ELEMENTS
Fig. 14-1 Front sideA

Input Terminals (plug connector)
N, LLine input
PE (Protective Earth) input

B

Output Terminals (plug connector)+
Positive output–
Negative (return) output

C

Output voltage potentiometer
See chapter 24.2.

D DC-OK LED (green)
On, when the output voltage is above 22V.
E

DC-OK Relay Contact (plug connector)
The DC-OK relay contact is synchronized with the DC-OK LED.
See chapter 8 for details.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
CP-Series

24V, 20A, SINGLE PHASE INPUT

15. EMCThe power supply is suitable for applications in industrial environment as well as in residential, commercial and lightindustry environment without any restrictions.
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 to generic standards: EN 61000-6-1 and EN 61000-6-2
Contact discharge
8kV
Criterion A
EN 61000-4-2
Air discharge
15kV
Criterion A
EN 61000-4-3
80MHz-2.7GHz
20V/m
Criterion A
Input lines
4kV
Criterion A
EN 61000-4-4
Output lines
2kV
Criterion A
DC-OK signal (coupling clamp)
2kV
Criterion A
LN
2kV
Criterion A
EN 61000-4-5
L  PE, N  PE
3kV
Criterion A+1kV
Criterion A
EN 61000-4-5+ / -  PE
2kV
Criterion A
EN 61000-4-5
DC-OK signal  PE
1kV
Criterion A
EN 61000-4-6
0.15-80MHz
20V
Criterion A
0% of 100Vac
0Vac, 20ms
Criterion A
EN 61000-4-11
40% of 100Vac
40Vac, 200ms
Criterion C
70% of 100Vac
70Vac, 500ms
Criterion A
0% of 200Vac
0Vac, 20ms
Criterion A
40% of 200Vac
80Vac, 200ms
Criterion A
70% of 200Vac
140Vac, 500ms
Criterion A
EN 61000-4-11
0% of 200Vac (=0V)
5000msCriterion C
SEMI F47 0706
Dips on the input voltage according to SEMI F47 standard
80% of 120Vac (96Vac)
1000msCriterion A
70% of 120Vac (84Vac)
500ms
Criterion A
50% of 120Vac (60Vac)
200ms
Criterion A
VDE 0160
Over entire load range
750V, 0.3ms
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
Conducted emission
input lines
Conducted emission
output lines**)Radiated emission
Harmonic input current

According to generic standards: EN 61000-6-3 and EN 61000-6-4
EN 55011, EN 55022, FCC Part 15, CISPR 11, CISPR 22
Class B
Limits for DC power port
according EN 61000-6-3 fulfilled
Class BClass A equipment: fulfilled
Class C equipment: fulfilled in
the load range from 8 to 24A
Fulfilled*)

IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
EN 55011, EN 55022
EN 61000-3-2

Voltage fluctuations, flicker EN 61000-3-3This device complies with FCC Part 15 rules.
Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) thisdevice must accept any interference received, including interference that may cause undesired operation.
*) tested with constant current loads, no pulsing**) for information only, not mandatory for EN 61000-6-3

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

The power supply has two converters with two different switching frequencies included.
70kHz to 130kHz
PFC converter, input voltage and output power dependent
80kHz to 140kHz
Main converter, output power dependent

Switching Frequencies
Switching frequency 1
Switching frequency 2

16. ENVIRONMENT
Operational temperature1)
Storage temperature
Output derating4)
Humidity2)
Atmospheric pressure-40°C to +70°C-40°C to +85°C
12W/K
5 to 95% r.h.
110-80kPa
80-47kPa
Up to 2000m
2000 to 6000m
30W/1000m or 5K/1000m
III

Altitude
Altitude derating4)
Over-voltage category

Reduce output power according Fig. 16-1
For storage and transportation+60°C to +70°C
IEC 60068-2-30
De-rating requirements of Fig. 16-2 apply
Without any restrictions
Derating4) requirements of Fig. 16-2 apply
Above 2000m , see Fig. 16-2
acc. IEC 61010-2-201, altitudes up to 2000m
acc. IEC 61010-2-201, altitudes up to 6000m
and atmospheric pressures from 80-47kPa
acc. IEC 61010-2-201, not conductive
IEC 60068-2-6IIDegree of pollution
Vibration sinusoidal3)

22-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
2 hours / axis
30g 6ms, 20g 11ms
IEC 60068-2-27
3 bumps / direction, 18 bumps in total
The unit does not release any silicone or other LABS-critical substances and is suitable foruse in paint shops.
Some small audible noise will be emitted from the power supply

Shock3)LABS compatibility
Audible noise

1) Operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2cm below the unit.
2) Do not energize while condensation is present
3) Tested in combination with DIN rails according to EN 60715 with a height of 15mm and a thickness of 1.3mm and standard orientation.
4) The de-rating is not hardware controlled. The customer has to take care by himself to stay below the de-rated current limits in order not tooverload the unit.
Fig. 16-1 Output current vs. ambient temp.
(Inom = 20A; Iout with PowerBoost = 24A)

Fig. 16-2 Output current vs. altitude
Allowed Output Current

Allowed Output Current

24A

B
A

20A

24A

D

20A

C
B
A

16A

16A

12A

12A

8A
4A
0
-40

0

20

40

A... Tamb < 60°C
B... Tamb < 50°C
C... Tamb < 45°C
D... Short term

8A

A... continuous
B... short term (max. 5s)

4A
60 70°C

Ambient Temperature

Altitude 0mAP*) 110kPa

2000m
80kPa

*) Atmospheric pressure

4000m
62kPa

6000m
47kPa

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

17. 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. 30.5Vdc
In case of an internal power supply defect, a redundantmax. 32Vdc
circuit limits the maximum output voltage. The output
shuts down and performs three restart attempts. If the
failure continues for longer than 1s , the output shuts
down. Cycle input power to reset.
IP 20
EN/IEC 60529> 5mm
E.g. screws, small parts
Output shut-down with automatic restart
yes **)
MOV(Metal Oxide Varistor)
included

For protection values see chapter 15 (EMC).
Not user replaceable slow-blow high-braking capacity
fuse*) In case of a protection event, audible noise may occur.
**) The temperature sensor is installed inside the isolating transformer and turns the unit off in safety critical situations (e.g. customer does
not care about de-rating requirements, ambient temperature too high, obstructs the airflow or install the unit in unsuitable mounting
orientation)
There is no correlation between the operating temperature and turn-off temperature since this is dependent on input voltage, load andinstallation methods.

18. 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 62477-1, IEC 60364-4-41
double or reinforced insulation
I
PE (Protective Earth) connection required
At delivered condition between input and output,> 500MOhm
measured with 500Vdc
At delivered condition between input and PE,> 500MOhm
measured with 500Vdc
At delivered condition between output and PE,> 500MOhm
measured with 500Vdc
At delivered condition between output and DC-OK> 500MOhm
contacts, measured with 500Vdc
Resistance between PE terminal and the housing in the< 0.1Ohm
area of the DIN rail mounting bracket.
typ. 0.32mA / 0.89mA
At 100Vac, 50Hz, TN-,TT-mains / IT-mains
typ. 0.46mA / 1.27mA
At 120Vac, 60Hz, TN-,TT-mains / IT-mains
typ. 0.73mA / 1.91mA
At 230Vac, 50Hz, TN-,TT-mains / IT-mains
max. 0.40mA / 1.07mA
At 110Vac, 50Hz, TN-,TT-mains / IT-mains
max. 0.56mA / 1.53mA
At 132Vac, 60Hz, TN-,TT-mains / IT-mains
max. 0.90mA / 2.34mA
At 264Vac, 50Hz, TN-,TT-mains / IT-mains

double or reinforced insulation

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

19. 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 thevoltage with a slow ramp (2s up and 2s down). 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

500Vac2000Vac>15mA

2000Vac>15mA

500Vac>20mA

500Vac>1mA

Fig. 19-1 Dielectric strength

DC-ok

Input
B

L
N

B

A

Field test
5s
Cut-off current setting
Field test)*)

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 ofthe output circuit shall be connected to the protective earthsystem. This helps to avoid situations in which a load starts
unexpectedly or cannot 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.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

20. APPROVED, FULFILLED OR TESTED STANDARDSIEC 61010-2-201

IEC 62368-1

UL 61010-2-201

ATEX

CB Scheme Certificate
Electrical Equipment for Measurement, Control andLaboratory Use - Particular requirements for control
equipment
CB Scheme Certificate
IEC 62368-1 Audio/video, information andcommunication technology equipment - Safety
requirements
Output safety level: ES1
UL Certificate
Listed equipment for category NMTR - Electrical
Equipment for Measurement, Control and Laboratory Use- Particular requirements for control equipment
Applicable for US and Canada
E-File: E198865
Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General
requirements
EN 60079-7, EN 60079-15 Equipment protection by typeof protection "e" and "n"Certificate: EPS 17 ATEX 1 089 X
Temperature Code: T4
Type of Protection: ec nC

IEC 60079 (IECEx)

IECEx Certificate
IEC 60079-0 Explosive atmospheres - General
requirements
IEC 60079-7, IEC 60079-15 Equipment protection bytype of protection "e" and "n"Certificate: IECEx EPS 17.0046X
Temperature Code: T4
Type of Protection: ec nC

Marine (DNV)

DNV Certificate
DNV Type approved product
Certificate: TAA00002A7
Temperature: Class D
Humidity: Class B
Vibration: Class C
EMC: Class B
Enclosure: Class A

Marine (LR)

Loyds Register Certificate
Lloyds Register Type approved product
Certificate: LR2001711TA
Category: ENV3

Marine (BV)

EMC: for bridge and deck zones
Bureau Veritas Marine and Offshore Certificate
BV (Bureau Veritas) type approved product
Certificate: 58507/A0 BV
EC-Code: 31B
EMC: for bridge and deck zones

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

Marine (ABS)Labs

BS Design Assessment Certificate
ABS (American Bureau of Shipment) assessed product
Certificate: 20-1980458-PDA
Bridge and deck zone
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

21. REGULATORY PRODUCT COMPLIANCE
CE

REACH Directive

EU Declaration of Conformity
Trade conformity assessment for Europe
The CE mark indicates conformance with the European- RoHS directive- EMC directive,- Low-voltage directive and the- ATEX directive
Manufacturer´s Statement
EU-Regulation regarding the Registration, Evaluation,
Authorisation and Restriction of Chemicals

WEEE Directive

Manufacturer´s Statement
EU-Directive on Waste Electrical and Electronic Equipment

RoHS (China RoHS 2)

Manufacturer´s Statement
Administrative Measures for the Restriction of the use ofhazardous substances in electrical and electronic products
25 years

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
CP-Series

24V, 20A, SINGLE PHASE INPUT

22. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth

DIN rail
WeightHousing material
Installation clearances

48mm
124mm (without plug-connectors)
127mm (without plug-connector)
The DIN rail depth must be added to the unit depth to calculate the total required
installation depth.
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
850g
Body: Aluminium alloy
Cover and mounting bracket: zinc-plated steel
See chapter 2

Fig. 22-1 Front viewFig. 22-2 Side viewAll dimensions in mm
All Dimensions in mm

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

23. ACCESSORIES
23.1. ZM10.WALL – WALL/PANEL MOUNT BRACKETThis bracket is used to mount the devices on a wall/panel without utilizing the DIN rail. The bracket can be mounted
without detaching the DIN rail brackets from the power supply. Product for illustration purpose only.
Fig. 23-1 Isometric viewFig. 23-4 Wall/panel mounting,front viewFig. 23-2 Isometric viewFig. 23-5 Hole pattern for wall
mounting

Fig. 23-3 Isometric viewFig. 23-6 Wall/panel mounting,side vie

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

24. APPLICATION NOTES
24.1. PEAK CURRENT CAPABILITY
The device has a power reserve of 20% included, which may even be used continuously at temperatures up to +45°C.
Additionally, it can deliver about 3 times the nominal output current for 12ms which helps to trip fuses on faulty
output branches or to start peak current demanding loads. Solenoids, contactors and pneumatic modules often have asteady state coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than thesteady-state current and usually exceeds the nominal output current (including the PowerBoost). The same situation
applies when starting a capacitive load.
The following examples show typical voltage dips:
Fig. 24-1 Peak load with 2x the nominal
current for 50ms, typ.

Fig. 24-2 60A Peak load for 12ms, typ.

40A Peak load (resistive) for 50ms
Output voltage dips from 24V to 16V.
Please note: The DC-OK relay triggers when the voltage dips below 22Vdc for longer than 1ms.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

24.2. ADJUSTMENT OF THE OUTPUT VOLTAGE
A voltage adjustment potentiometer can be found behind the flap on the front of the unit (see chapter 14). However,
it is not recommended to change the output voltage since load sharing between power supplies connected in parallel
can only be achieved by a precise setting of the output voltage. This is the case with the factory settings.
Only trained personnel should operate the voltage adjustment potentiometer.
Lower end of the specified adjustment range
Output voltage
min.
24.0V

Output current

At 20ADue to the soft output voltage regulation
characteristic a setting to 24.0V results to an output
voltage of 23.8V±0.2% at 24A and 25.0V±0.2% at no load.
See Fig. 24-3.
24A
At 45°C
20A
At 60°C
15A
At 70°C
Reduce output current linearly between +45°C and +70°C.

min.
min.
min.

Upper end of the specified adjustment range
Output voltage
min.
28.0V

Output current

At 17.1A
Due to the soft output voltage regulation
characteristic a setting to 28.0V results to an output
voltage of 27.7V±0.2% at 20.6A and 29.2V±0.2% at noload.
See Fig. 24-3.
20.6A
At 45°C
17.1A
At 60°C
13.0A
At 70°C
Reduce output current linearly between +45°C and +70°C.

min.
min.
min.

The maximum output voltage which can occur at the clockwise end position of the potentiometer due to tolerances is30V. It is not a guaranteed value which can be achieved. The typical value is 29.5V.
Current values between 24 and 28V can be interpolated.
Fig. 24-3 Adjustment range of the output
voltage
Output Voltage Range, typ.
29.2V
28.0V
27.7V

Specified
Adjustment
Range

24.0A

20.0A
20.6A

Output Current

17.1A

0A

25.0V
24.0V
23.8V

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP-Series

24.3. 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 35Vdc.

24.4. 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.

24.5. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCB’s or UL 1077 circuit breakers) are commonly used for AC-supply systems andmay also be used on 24V 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 size that 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 24V branches which are supplied by the same source, afast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly tothe ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors.
Furthermore, the impedance of the faulty branch must be 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 crosssection and wire length.
Fig. 24-4 Test circuit

Power Supply

AC

MCB

+
Wire length

DC S1... Fault simulation switch

*)

Load

+
S1

-

Maximal wire length*) for a fast (magnetic) tripping:
0.75mm²
1.0mm²1.5mm²2.5mm²
34m
45m
64m
101m
C-2A
C-3A
27m
36m
52m
79m
C-4A
19m
26m
35m
56m
C-6A
9m
12m
16m
23m
4m
8m
12m
18m
C-8A
C-10A
4m
6m
9m
15m
C-13A
2m
3m
4m
5m
B-6A
23m
30m
38m
67m
B-10A
11m
14m
21m
32m
B-13A
7m
12m
17m
23m
B-16A
4m
6m
8m
11m
B-20A
1m
1m
2m
4m

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

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

24.6. 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 the output voltage does not exceed 150Vdc. Voltages with apotential above 60Vdc are not SELV anymore and can be dangerous. Such
Unit A
voltages must be installed with a protection against touching.
Input
Avoid return voltage (e.g. from a decelerating motor or battery) which isapplied to the output terminals.

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

Output+-+Unit B

Load

Input

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

Output-+-24.7. PARALLEL USE TO INCREASE OUTPUT POWER
Power supplies can be paralleled to increase the output power. For
redundancy applications one extra power supply is always needed forsufficient output current in case one unit fails.

Unit AInput

The unit is permanently set to “parallel use” mode in order to achieveload sharing between power supplies connected in parallel. The “Paralleluse” mode 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.

+-

Output+Unit B

Load

Input

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

+-

Output-Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other.
Do not use power supplies in parallel in mounting orientations other than the standard mounting orientation (input
terminals on bottom of the unit) or in any other condition where a derating of the output current is required (e.g.
altitude).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
Do not load paralleled power supplies with higher currents as shown in the following diagrams:
Fig. 24-5 Output current vs. ambient temp. fortwo paralleled units

Fig. 24-6 Output current vs. ambient temp.
for three paralleled units

Allowed output current for two paralleled units
48A
B

Allowed output current for three paralleled units
72A
B

40A

60A

A

32A

28A

42A

24A

36A
A... continuous
B... short term (max. 5s)

16A
8A
0

30

A

48A

36.6

40

50

60

70°C

24A
A... continuous
B... short term (max. 5s)

12A
0

30

36.6

Ambient Temperature

40

50

60

70°C

Ambient Temperature

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

26/28

CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

24.8. PARALLEL USE FOR REDUNDANCYPower supplies can be paralleled for redundancy to gain higher system availability. The unit is already equipped with a
MOSFET as decoupling device on the output to avoid, that a defective unit becomes a load for the other power
supplies and the output voltage can not be maintained any more.
Recommendations for building redundant power systems:a)b)

Use separate input fuses for each power supply.
Monitor the individual power supply units. Therefore, use the built-in DC-OK relay contact of the power supply.

Fig. 24-7 Wiring diagram, 1+1 Redundancy for 20A output current
24V, 20A
Load

FailureMonitor

-

+

-

+

Output 24V 20A

Output 24V 20A

DC-OK

DC-OK

DCOK

DCOK

CP20.245-R2
Power Supply

CP20.245-R2
Power Supply

Input
L N PEInput
L N PE

I

I

L
N
PE

Note: Use separate mains systems for each power supply whenever it is possible

Fig. 24-8 Wiring diagram, N+1 Redundancy for 40A output current
24V, 40A
Load

-

+

Output 24V 20A

FailureMonitor-+

Output 24V 20A-+

Output 24V 20A

DC-OK

DC-OK
DCOK

DC-OK

DCOK

DCOK

CP20.245-R2
Power Supply

CP20.245-R2
Power Supply

CP20.245-R2
Power Supply

Input
L N PEInput
L N PEInput
L N PE

I

I

Observe thetemperature derating
requirements of Fig. 24-5
and Fig. 24-6 for n+1
redundancy applications.

I

L
N
PE

Note: Use separate mains systems for each power supply whenever it is possible.

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

24.9. 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 > 1F are connected to the output,
the unit might charge the capacitor in the HiccupPLUS® mode (see chapter 6).

24.10. OPERATION ON TWO PHASESThe power supply can also be used on two-phases of a three-phasesystem. 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

AC
L
N
PE

L2

DC

24.11. USE IN A TIGHTLY SEALED ENCLOSURE
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 9519 100, plastic, 180x180x165mm
24V, 16A; (=80%) load is placed outside the box
230Vac
51.9°C (in the middle of the right side of the power supply with a distance of 2cm)
25.6°C
26.3K

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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CP20.245-R2
24V, 20A, SINGLE PHASE INPUT

CP-Series

24.12. MOUNTING ORIENTATIONSMounting orientations other than all terminals on the bottom require a reduction in continuous output power or alimitation in the maximum allowed ambient temperature. The amount of reduction influences the lifetime expectancyof the power supply. Therefore, two different derating curves for continuous operation can be found below:
Curve A1
Curve A2

Recommended output current.
Max allowed output current (results in approximately half the lifetime expectancy of A1).

Fig. 24-9
Mounting
Orientation A(Standardorientation)

Output Current

24A

OUTPUT

A1

18
Power
Supply12
6
Ambient Temperature

0

INPUT

10
Fig. 24-10
Mounting
Orientation B(Upside down)

20

30

50

40

60°C

Output Current

24A
A1

INPUT

18

A2

Power
Supply12
6
Ambient Temperature

OUTPUT

010

Fig. 24-11
Mounting
Orientation C(Table-top
mounting)

20

30

50

40

60°C

Output Current

24A
A1

18

A2

12
6
Ambient Temperature

0
10

50

40

60°C

24A
OUTPUT

Power
Supply

18

A1

12

A2

6
Ambient Temperature

0
10

20

30

40

A1

A2

50

60°C

Output Current

18
INPUT

Power
Supply24A
OUTPUT

Fig. 24-13
Mounting
Orientation E(Horizontal ccw)

30

Output Current

INPUT

Fig. 24-12
Mounting
Orientation D(Horizontal cw)

20

12
6

Ambient Temperature

0
10

20

30

40

50

60°C

Jul. 2024 / Rev 1.2 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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