CP20.241
CP20.241-C1
CP20.241-S1
CP20.241 CP20.241-C1 CP20.241-S1 CP20.241-S2

AC 24V 480W

POWER SUPPLY
•
•
•
•
•
•
•
•
•
•
•
•
•

PRODUCT DESCRIPTION

AC 100-240V wide-range input
Width only 48mm
Efficiency up to 95.6%
Excellent partial load efficiency
20% Output power reserves (PowerBoost)
Easy fuse breaking - 3 times nominal current for 12ms
Safe HiccupPLUS overload mode
Active power factor correction (PFC)
Minimum inrush current surge
Full power between -25°C and +60°C
DC-OK relay contact
Current sharing feature for parallel use
3 years warranty

SHORT-FORM DATAThe Dimension CP-Series are cost optimized power
supplies without compromising quality, reliability andperformance. The most outstanding features of CP20
series are the high efficiency, electronic inrush current
limitation, active PFC, wide operational temperature
range and the extraordinary small size.

Output voltage
DC 24V
Adjustment range 24-28Vdc

The CP20.241-C1 is equipped with conformal coatedpc-boards preferred for applications in harsh areas.

PowerBoost

The CP20.241-S1 is equipped with quick-connect
spring-clamp terminals preferred for applications
which are exposed to mechanical vibration.
The CP20.241-S2 has push-in terminals optimized foreasy cabinet wiring.
The CP20.241-V1 is equipped with a remote ON/OFF
feature.
The devices also offer PowerBoost: Power reservesof 20%, which may even be used continuously attemperatures up to +45°C.
High immunity to transients and power surges aswell 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
Description:
Order Number:
CP20.241
CP20.241-C1
CP20.241-S1

Power supply CP20.241-xx

CP20.241-S2
CP20.241-V1

Conformal coated pc-boards
Quick-connect spring-clamp
terminals
Push-in terminals
Remote ON/OFF feature

Accessories:
ZM10.WALL

Wall/Panel mount bracket

CP20.241-S2
CP20.241-V1

Output current

NominalFactory setting 24.1V

20-17.1A
Up to +60°C ambient
15-13AAt +70°C ambient
Derate linearly between +60°C and +70°C
24A
Up to +45°C ambient
Linear decrease to nominal power
between +45°C and +60°C

Input voltage AC
Mains frequency
Input current AC
Power factor

AC 100-240V
50-60Hz4.26 / 2.23A
0.996 / 0.98

±10%
±6%
At 120 / 230Vac
At 120 / 230Vac

Input voltage DC
Input current DC

DC 110-150V
4.64A

±20%
At 110Vdc

AC Inrush current

10 / 4.5Apeak

At 120 / 230Vac

Efficiency
Power losses

94.2 / 95.6%
29.6 / 22.1W

At 120 / 230Vac
At 120 / 230Vac

Hold-up time

32 / 32ms

At 120 / 230Vac

Temperature range -25°C to +70°C
Size (w x h x d)
Weight48x124x127mm
830g

Without DIN rail

MAIN APPROVALS
For details and the complete approval list, see chapter 21.

UL 61010-2-201

ATEX

IECEx

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

1 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

Index
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Intended Use............................................................
Installation Instructions...........................................
AC Input....................................................................
DC Input....................................................................
Input Inrush Current................................................
Output.......................................................................
Hold-up Time............................................................
DC-OK Relay Contact...............................................
Remote ON / OFF Function......................................
Efficiency and Power Losses....................................
Lifetime Expectancy.................................................
MTBF.........................................................................
Functional Diagram.................................................
Terminals And Wiring..............................................
Front Side And User Elements................................
EMC...........................................................................
Environment.............................................................
Protection Features..................................................
Safety Features.........................................................
Dielectric Strength...................................................

3
3
5
6
7
8
10
11
11
12
13
13
14
16
17
18
19
20
20
21

21
22
23
24

Approved, Fulfilled or Tested Standards................
Regulatory Product Compliance.............................
Physical Dimensions And Weight............................
Accessories................................................................
24.1 ZM10.Wall - Wall/Panel Mount Bracket......
24.2 UF20.241 - Buffer Module............................
24.3 YR40.241 - Redundancy Module..................
24.4 YR40.242 – Redundancy Module.................
24.5 YR40.245 - Redundancy Module..................
25 Application Notes....................................................
25.1 Peak Current Capability...............................
25.2 Output Circuit Breakers................................
25.3 Parallel Use to Increase Output Power........
25.4 Parallel Use for Redundancy........................
25.5 Series Operation...........................................
25.6 Charging of Batteries...................................
25.7 Two Phases Operation..................................
25.8 Use in a Tightly Sealed Enclosure................
25.9 Mounting Orientations................................

22
23
24
25
25
25
26
26
26
27
27
28
28
29
30
30
30
31
32

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 the word. As thestate of our knowledge and experience is constantly changing, the information in this data sheet is subject to revision. We
therefore kindly ask you to always use the latest issue of this document (available under www.pulspower.com).
No part of this document may be reproduced or utilized in any form without our prior permission in writing.
Packaging and packaging aids can and should always be recycled. The product itself may not be disposed of as domestic
refuse.

Terminology and Abbreviations
PE andSymbolEarth, Groundt.b.d.
AC 230V

230Vac50Hz vs. 60Hz
may
shall
shouldPE 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”.
To be defined, value or description will follow later.
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)
A figure with the unit (Vac) at the end is a momentary figure without any additional tolerances
included.
As long as not otherwise stated, AC 230V parameters are valid at 50Hz mains frequency.
A key word indicating flexibility of choice with no implied preference.
A key word indicating a mandatory requirement.
A key word indicating flexibility of choice with a strongly preferred implementation.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

2 / 32

CP20.241
CP20.241-C1
CP20.241-S1

1.

CP20.241-S2
CP20.241-V1

Intended Use

This device is designed for installation in an enclosure and is intended for commercial use, such as in industrial control,
process control, monitoring and measurement equipment or the like.
Do not use this device in equipment, where malfunctioning may cause severe personal injury or threaten human life. If thisdevice is used in a manner outside of its specification, the protection provided by the device may be impaired.

2.

Installation Instructions
WARNING–––––

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

Turn power off before working on the device. Protect against inadvertent re-powering.
Do not open, modify or repair the device.
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.
NOTE

Notes for use in hazardous location areas:
The device is suitable for use in Class I Division 2 Groups A, B, C, D T4 locations and for use in Group II Category 3 (Zone2) environments.
Classification: ATEX: EPS 17 ATEX 1 089 X, II 3G Ex ec nC IIC T4 Gc / IECEx EPS 17.0046X
CAUTIONWARNING EXPLOSION HAZARDS!

– Do not use with DC input voltages. Do not use with AC input voltages below 90Vac.
– Use only in standard vertical mounting orientation with the input terminals on bottom of the unit. Substitution ofcomponents 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 isknown to be non-hazardous.
– A suitable enclosure must be provided for the end product which has a minimum protection of IP54 and fulfils therequirements of the EN 60079-0.
This device may only be installed and put into operation by qualified personnel. This device does not contain serviceableparts. 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 the device 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 thatare designed 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. Use ferrules for wires on the input terminals. Unused screw terminals should be securely tightened.
The device is designed for use in 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 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 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 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.
This device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do notcover ventilation grid!
The device is designed for altitudes up to 5000m. Above 2000m a reduction in output current and over voltage category
is required.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

3 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

Keep the following installation clearances: 40mm on top, 20mm on the bottom, 5mm on the 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.
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.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

4 / 32

CP20.241
CP20.241-C1
CP20.241-S1

3.

CP20.241-S2
CP20.241-V1

AC Input

The device is suitable to be supplied from TN-, TT- or IT-mains networks with AC voltage. For suitable DC supply voltages
see chapter 4.
AC input
AC input rangenom.

AC 100-240V
90-264Vac
264-300Vac

Occasionally for maximum 500ms

Allowed voltage L or N to
earth

max.

300VacContinuous, according to IEC 60664-1

Input frequency

nom.

50-60Hz±6%

Turn-on voltage
Shut-down voltage

typ.
typ.

82Vac
72Vac

Steady-state value, see Fig. 3-1
Steady-state value, see Fig. 3-1

External input protection

See recommendations in chapter 2.
AC 100VAC 120V

AC 230V

Input current

typ.

5.15A

4.26A

2.23A

At 24V, 20A, see Fig. 3-3

*)

typ.

0.996

0.996

0.98

At 24V, 20A, see Fig. 3-4

Crest factor **)

typ.

1.65

1.63

1.63

At 24V, 20A

Start-up delay
Rise time

typ.
typ.

450ms
145ms

450ms
145ms

450ms
145ms

typ.

160ms

160ms

160ms

See Fig. 3-2
At 24V, 20A const. current load, 0mF
load capacitance, see Fig. 3-2
At 24V, 20A const. current load,
20mF load capacitance, see Fig. 3-2

max.

200mV

200mV

200mV

Power factor

Turn-on overshootIn single use mode, 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

Fig. 3-2: Turn-on behavior, definitions

Fig. 3-3: Input current vs. output
current at 24V output voltage

Fig. 3-4: Power factor vs. output
current at 24V output voltage

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

5 / 32

CP20.241
CP20.241-C1
CP20.241-S1

4.

CP20.241-S2
CP20.241-V1

DC Input

DC inputnom.

DC input range

DC 110-150V±20%

88-180Vdc

DC input current

typ.

4.64A

At 110Vdc, 24V, 20A

Allowed voltage (+) or (−)
input to earthmax.

375VdcContinuous, according to IEC 60664-1

Turn-on voltage
Shut-down voltage

typ.
typ.

80Vdc
70Vdc

Steady state value
Steady state value
The device is suitable to be supplied from a DC input
voltage.
Instructions for DC use:a) Use a battery or a similar DC source.
WARNINGA supply from the intermediate DC-bus of a frequency
converter is not recommended and can cause a
malfunction or damage the unit.

Fig. 4-1: Wiring for DC Inputb) Connect (+) pole to L and (–) pole to N.
c) Connect the PE terminal to an earth wire or to themachine ground.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

6 / 32

CP20.241
CP20.241-C1
CP20.241-S1

5.

CP20.241-S2
CP20.241-V1

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 Ipeak
Inrush energy I2t

AC 100VAC 120V

AC 230Vmax.

15Apeak

12Apeak

5.5ApeakTemperature independent

typ.

12Apeak

10Apeak

4.5ApeakTemperature independent

max.

1A2s

1A2s

1A2s

Temperature independentFig. 5-1: Typical turn-on behaviour
at nominal load and 25°C ambient

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

7 / 32

CP20.241
CP20.241-C1
CP20.241-S1

6.

CP20.241-S2
CP20.241-V1

OutputThe output provides a SELV/PELV/EST1 rated voltage, which is galvanically isolated from the input voltage.
The output 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 an intermittent mode.
The output is electronically protected against overload, no-load and short-circuits. In case of a protection event, audible
noise may occur.
Output voltage

nom.

24V

max.

24-28V
30V

Factory settings

typ.
typ.

24.1V
24.1V

Line regulation
Load regulation

max.
max.
typ.

10mV
100mV
1000mV

Between 90 and 300Vac input voltage change
Between 0 and 24A in “single use” mode, static value
Between 0 and 20A in “parallel use” mode, static value, seeFig. 6-2

Ripple and noise voltage

max.

50mVpp

Bandwidth 20Hz to 20MHz, 50Ohm

Output current

nom.
20A
At 24V and up to +60°C ambient temperature, see Fig. 6-1
nom.
15A
At 24V and +70°C ambient temperature, see Fig. 17-1
nom.
17.1A
At 28V and up to +60°C ambient temperature, see Fig. 6-1
nom.
13A
At 28V and +70°C ambient temperature, see Fig. 17-1
Derate linearly between +60°C and +70°C, see chapter 17

PowerBoost1)

nom.
24A
At 24V and up to +45°C ambient temperature, see Fig. 17-1
nom.
20.6A
At 28V and up to +45°C ambient temperature, see Fig. 17-1
PowerBoost decreases linearly to nominal power between +45°C and +60°C. See chapter 17

Fuse breaking current

typ.

Overload behavior

Continuous current
Intermittent current2)

For output voltage above 13Vdc, see Fig. 6-1
For output voltage below 13Vdc, see Fig. 6-1

Overload/
short-circuit current

max.
typ.

29.8A
29A

max.

9.8A

Continuous current, see Fig. 6-1
Intermitted current peak value for typ. 2s
Load impedance 10mOhm, see Fig. 6-2.
Discharge current of output capacitors is not included.
Intermitted current average value (R.M.S.)
Load impedance 10mOhm, see Fig. 6-2

Output capacitancetyp.

8500μF

Included inside the power supply

Back-feeding loads

max.

35V

The unit 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
absorbing energy can be calculated according to the built-in
large sized output capacitor.

Adjustment range

60A

Guaranteed value
This is the maximum output voltage which can occur atthe clockwise end position of the potentiometer due
to tolerances. It is not a guaranteed value which can beachieved.
±0.2% in “single use” mode at full load, cold unit
±0.2% in “parallel use” mode at 20A, cold unit (results totyp. 23.9V±0.2% at 24A and typ. 25.1V±0.2% at no load)

Up to 12ms once every five seconds, see Fig. 6-2. The fusebraking current is an enhanced transient current whichhelps to trip fuses on faulty output branches. The output
voltage stays above 20V.

1)

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.

2)

At heavy overloads (when output voltage falls below 13V), the power supply delivers continuous output current for 2s. After this, the output isswitched off for approx. 18s before a new start attempt is automatically performed. This cycle is repeated as long as the overload exists. If theoverload has been cleared, the device will operate normally. See Fig. 6-3.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

8 / 32

CP20.241
CP20.241-C1
CP20.241-S1

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

CP20.241-S2
CP20.241-V1

Fig. 6-2: Dynamic overcurrent capability, typ.

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

Fig. 6-4: Output voltage in “parallel use” mode, typ.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

9 / 32

CP20.241
CP20.241-C1
CP20.241-S1

7.

CP20.241-S2
CP20.241-V1

Hold-up TimeThe hold-up time is the time during which a power supply’s output voltage remains within specification following the lossof input power. The hold-up time is output load dependent. At no load, the hold-up time can be up to several seconds.
The green DC-OK LED is also on during this time.

Hold-up time

typ.
min.
typ.
min.

AC 100VAC 120V

AC 230V

65ms
54ms
32ms
24ms

65ms
54ms
32ms
24ms

65ms
54ms
32ms
24ms

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

At 24V, 10A, see Fig. 7-1
At 24V, 10A, see Fig. 7-1
At 24V, 20A, see Fig. 7-1
At 24V, 20A, see Fig. 7-1

Fig. 7-2: Shut-down behaviour, definitions

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

10 / 32

CP20.241
CP20.241-C1
CP20.241-S1

8.

CP20.241-S2
CP20.241-V1

DC-OK Relay Contact

This feature monitors the output voltage on the output terminals of a running power supply.
Contact closes

As soon as the output voltage reaches typ. 90% of the adjusted output voltage level.

Contact opens

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.

Switching hysteresis

typ. 1V

Contact ratings

Maximal 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A, resistive load
Minimal permissible load: 1mA at 5Vdc

Isolation voltage

See dielectric strength table in chapter 20.

Fig. 8-1: DC-ok relay contact behavior

9.

Remote ON / OFF Function

This feature is available only for the CP20.241-V1 and allows to switch-off thepower supply output with a signal switch or transistor. A link between pin 15
and 16 turns the power supply on. Pin 15 is referenced to the (-) output voltage.
The open-loop voltage between pin 16 and pin 15 can be up to 18V. The
maximum current, when in remote ON mode, can be up to 2.5mA.
The threshold level to switch-off the output is typically 5V and the turn-on
threshold is typically 9V.
When multiple power supplies are connected in parallel, pin 15 and pin 16
are also allowed to be paralleled to control all units with the same switch ortransistor.
Please note: The remote ON/OFF function has no safety feature included.

Fig. 9-1: The switch-off and the turn-on timingA:

Turn-on delay according to Fig. 3-2

B:

Rise time according to Fig. 3-2

C:

No active discharge of the output after switch-off

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

11 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

10. Efficiency and Power Losses
AC 100VAC 120V

AC 230V

Efficiency

typ.
typ.

93.6%
93.5%

94.2%
94.1%

95.6%
95.5%

At 24V, 20A
At 24V, 24A (PowerBoost)

Average efficiency*)

typ.

93.2%

93.8%

95%

25% at 5A, 25% at 10A,
25% at 15A, 25% at 20A

Power losses

typ.
typ.
typ.
typ.
typ.

0.4W
2.5W
16W
32.8W
40W

0.5W
2.2W
15W
29.6W
36.1W

0.9W
2.2W
12.5W
22.1W
27.1W

CP20.241-V1 in “Remote OFF” mode
At 24V, 0A
At 24V, 10A
At 24V, 20A
At 24V, 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. 10-1: Efficiency vs. output current at 24V, typ.

Fig. 10-2: Losses vs. output current at 24V, typ.

Fig. 10-3: Efficiency vs. input voltage at 24V, 20A, typ.

Fig. 10-4: Losses vs. input voltage at 24V, 20A, typ.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

12 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

11. Lifetime Expectancy
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.

Lifetime expectancy

AC 100VAC 120V

AC 230V

123 000h
348 000h
48 000h
136 000h
23 000h64 000h

149 000h
422 000h
60 000h
169 000h
31 000h
88 000h

173 000h
488 000h
94 000h
265 000h
54 000h
152 000h

At 24V, 10A and 40°C
At 24V, 10A and 25°C
At 24V, 20A and 40°C
At 24V, 20A and 25°C
At 24V, 24A and 40°C
At 24V, 24A and 25°C

12. MTBF
MTBF stands for Mean Time Between Failures, which is calculated according to statistical device failures, and indicatesreliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent
the lifetime of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000 h meansthat statistically one unit out of 10 000 installed units will fail every 100 h. However, it can not be determined if the failed
unit has been running for 50 000 h or only for 100 h.
For these types of units the MTTF (Mean Time To Failures) value is the same value as the MTBF value.
AC 100VAC 120V

AC 230V

MTBF SN 29500, IEC 61709

422 000h
790 000h

445 000h
832 000h

590 000h
1 060 000h

At 24V, 20A and 40°C
At 24V, 20A and 25°C

MTBF MIL HDBK 217F

186 000h

191 000h

226 000h

256 000h

263 000h

313 000h

40 000h42 000h

50 000h53 000h55 000h

67 000h

At 24V, 20A and 40°C;
Ground Benign GB40
At 24V, 20A and 25°C;
Ground Benign GB25
At 24V, 20A and 40°C;
Ground Fixed GF40
At 24V, 20A and 25°C;
Ground Fixed GF25

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

13 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

13. Functional Diagram

Fig. 13-1: Functional diagram CP20.241, -C1, -S1

Fig. 13-2: Functional diagram CP20.241-S2

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

14 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

Fig. 13-3: Functional diagram CP20.241-V1

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

15 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

14. Terminals And Wiring
The terminals are IP20 Finger safe constructed and suitable for field- and factory wiring.
CP20.241, -C1, -V1
Type
Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter (including
ferrules)Recommended tightening torque
Wire stripping length
Screwdriver

Input
Screw terminals
max. 6mm2
max. 4mm2
AWG 20-10
2.8mm

OutputScrew terminals
max. 6mm2
max. 4mm2
AWG 20-10
2.8mm

Signal Terminals
Push-in terminals
max. 1.5mm2
max. 1.5mm2
AWG 24-16
1.6mm

max. 1Nm
7mm
3.5mm slotted or crosshead No 2

max. 1Nm
7mm
3.5mm slotted or crosshead No 27mm
3mm slotted to open thespring

CP20.241-S1
Type

Input
Quick-connect springclamp terminals
max. 6mm2
max. 4mm2
AWG 20-10
2.8mm

OutputQuick-connect springclamp terminals
max. 6mm2
max. 4mm2
AWG 20-10
2.8mm

Signal Terminals
Push-in terminals

10mm
-

10mm
-

7mm
3mm slotted to open thespringInput
Push-in terminals
max. 2.5mm2
max. 2.5mm2
max. 1.5mm2
AWG 24-12
2.3mm

OutputPush-in terminals
max. 10mm2
max. 6mm2
max. 4mm2
AWG 24-83.3mm

Signal Terminals
Push-in terminals
max. 1.5mm2
max. 1.5mm2
max. 1.5mm2
AWG 24-16
1.6mm

10mm
3mm slotted to open thespring15mm
3mm slotted to open thespring7mm
3mm slotted to open thespringSolid wire
Stranded wire
American Wire Gauge
Max. wire diameter (including
ferrules)Wire stripping length
Screwdriver
CP20.241-S2
Type
Solid wire
Stranded wire
Stranded wire (including ferrules)
American Wire Gauge
Max. wire diameter (including
ferrules)Wire stripping length
Screwdriver

max. 1.5mm2
max. 1.5mm2
AWG 24-16
1.6mm

Daisy chaining:
Daisy chaining (jumping from one power supply output to the next) is not allowed. Use a separate distribution terminal
block as shown in Fig. 14-1.

Fig. 14-1: Using distribution terminals

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

16 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

15. Front Side And User Elements

Fig. 15-1: Frontside CP20.241, -C1

A

Input Terminals
N, L

Fig. 15-2: Frontside CP20.241-S1

Fig. 15-3: Frontside CP20.241-S2

Fig. 15-4: Frontside CP20.241-V1

Line input
PE (Protective Earth) input

B

Output Terminals
CP20.241-S2: One (+) pole and two identical (−) poles
All other devices: Two identical (+) poles and three identical (−) poles(+)
Positive output(−)
Negative output (return)C

Output Voltage Potentiometer
Open the flap to adjust the output voltage. Factory setting: 24.1V
DC-OK LED (green)
On, when the output voltage is >90% of the adjusted output voltage.
DC-OK Relay Contact Push-in terminals
The DC-OK relay contact is synchronized with the DC-OK LED. See chapter 8 for details.
“Parallel Use” “Single Use” Link
Link the two terminal poles when power supplies are connected in parallel. In order to achieve a sharing of theload current between the individual 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 25.3.
Remote ON/OFF Input
Pin 15 and 16 must be connected to turn the power supply on. See chapter 9 for details.

D
E
F

G

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

17 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

16. EMCThe EMC behavior of the device is designed for applications in industrial environment as well as in residential, commercial
and light industry environments. The output is allowed to be grounded or floating.
Without additional measures to reduce the conducted emissions on the output (e.g. by using a filter), the device is notsuited to supply a local DC power network in residential, commercial and light-industrial environments. No restrictions
apply for local DC power networks in industrial environments.
EMC Immunity

According to generic standards: EN 61000-6-1, EN 61000-6-2, EN 61000-6-3 and EN
61000-6-4

Electrostatic discharge

EN 61000-4-2

Contact discharge
Air discharge

8kV
15kV

Criterion A
Criterion A

Electromagnetic RF field

EN 61000-4-3

80MHz - 2.7GHz

20V/m

Criterion A

Fast transients (Burst)

EN 61000-4-4

Input lines
Output lines
Signal lines (coupling clamp)

4kV
2kV
2kV

Criterion A
Criterion A
Criterion A

Surge voltage on input

EN 61000-4-5

L→N
L → PE, N → PE

2kV
2kV

Criterion A
Criterion A

Surge voltage on output

EN 61000-4-5(+) → (−)(+) / (−) → PE

1kV
2kV

Criterion A
Criterion A

Surge voltage on DC-OK

EN 61000-4-5

DC-OK signal → PE

1kV

Criterion A

Conducted disturbanceEN 61000-4-6

0.15 - 80MHz

20V

Criterion A

Mains voltage dips

EN 61000-4-11

0% of 100Vac
40% of 100Vac
70% of 100Vac
0% of 200Vac
40% of 200Vac
70% of 200Vac

0Vac, 20ms
40Vac, 200ms
70Vac, 500ms
0Vac, 20ms
80Vac, 200ms
140Vac, 500ms

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

Voltage interruptions

EN 61000-4-11

0% of 200Vac (=0V)

5000msCriterion C

Powerful transients

VDE 0160

Over entire load range

750V, 0.3ms

Criterion A

Performance criterions:A:

The device shows normal operation behavior within the defined limits.

C:

Temporary loss of function is possible. The device may shut-down and restarts by itself. No damage or hazards for the device will occur.

EMC Emission
Conducted emission input lines

EN 55011, EN 55032, FCC Part 15,
CISPR 11, CISPR 32

Class B

Radiated emission

EN 55011, EN 55032

Class B

Harmonic input current (PFC)

EN 61000-3-2

Fulfilled for Class A equipment
Fulfilled for Class C equipment in the load
range from 8 to 24A

Voltage fluctuations, flicker

EN 61000-3-3

Fulfilled, tested with constant current loads,
non pulsing

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) thisdevice must accept any interference received, including interference that may cause undesired operation.
Switching Frequencies
PFC converter
Main converter
Auxiliary converter

100kHz80kHz to 140kHz
60kHz

Fixed frequency
Output load dependent
Fixed frequency

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

18 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

17. Environment
Operational temperature-25°C to +70°C

Storage temperature-40°C to +85°C

Output derating

12W/K
Between +60°C and +70°C
1.33A/1000m or 5K/1000m
For altitudes >2000m, see Fig. 17-2
The derating is not hardware controlled. The user has to take care by himself to stay
below the derated current limits in order not to overload the unit.

Humidity

5 to 95% r.h.

According to IEC 60068-2-30

Atmospheric pressure

110-47kPa

See Fig. 17-2 for details

Altitude

Up to 5000m

See Fig. 17-2 for details

Over-voltage category

III
II

According to IEC 60664-1 for altitudes <2000m
According to IEC 60664-1 for altitudes >2000m

Degree of pollution

2

According to IEC 62477-1, not conductive

Vibration sinusoidal

2-17.8Hz: ±1.6mm
According to IEC 60068-2-6
17.8-500Hz: 2g
2 hours / axis
30g 6ms, 20g 11ms
According to IEC 60068-2-27
3 bumps / direction, 18 bumps in total
Shock and vibration is tested in combination with DIN rails EN 60715 with a height of
15mm and a thickness of 1.3mm and standard orientation.

Shock

Audible noise

The operational temperature is the same as
the ambient or surrounding temperature. It isdefined as the air temperature 2cm below thedevice.
For storage and transportation

Some audible noise may be emitted from the power supply during no load, overload or
short circuit.

Fig. 17-1: Output current vs. ambient temp.
(Inom = 20A; Iout with PowerBoost = 24A)

Fig. 17-2: Output current vs. altitude

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

19 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

18. Protection Features
Output over-voltage
protection

typ.

30.5Vdc

max. 32Vdc

In case of an internal power supply defect, a redundantcircuit limits the maximum output voltage. The output shuts
down and automatically attempts to restart.

Degree of protection
Penetration protection

IP20
>5mm

EN/IEC 60529
E.g. screws, small parts

Over-temperature
protection

Included

Output shut-down with automatic restart.
Temperature sensors are installed on critical components
inside the unit and turn the unit off in safety criticalsituations, which can happen e.g. when ambient
temperature is too high, ventilation is obstructed or thederating requirements are not followed. There is nocorrelation between the operating temperature and turnoff temperature since this is dependent on input voltage,load and installation methods.

Input transient protection

MOV (Metal Oxide
Varistor)

For protection values see chapter (EMC).

Internal input fuse

IncludedNot user replaceable slow-blow high-braking capacity fuse

19. Safety Features
Class of protectionI

PE (Protective Earth) connection required
According to IEC 61140

Isolation resistance>500MOhm

At delivered condition between input and output,
measured with 500Vdc
At delivered condition between input and PE,
measured with 500Vdc
At delivered condition between output and PE,
measured with 500Vdc
At delivered condition between output and DC-OK
contacts, measured with 500Vdc>500MOhm>500MOhm>500MOhm
PE resistance<0.1Ohm

Resistance between PE terminal and the housing in
the area of the DIN rail mounting bracket.

Touch current (leakage current)

typ. 0.12mA / 0.31mA
typ. 0.18mA / 0.45mA
typ. 0.3mA / 0.76mA
max. 0.16mA / 0.38mA
max. 0.23mA / 0.55mA
max. 0.39mA / 0.94mA

At 100Vac, 50Hz, TN-, TT-mains / IT-mains
At 120Vac, 60Hz, TN-, TT-mains / IT-mains
At 230Vac, 50Hz, TN-, TT-mains / IT-mains
At 110Vac, 50Hz, TN-, TT-mains / IT-mains
At 132Vac, 60Hz, TN-, TT-mains / IT-mains
At 264Vac, 50Hz, TN-, TT-mains / IT-mains

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

20 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

20. Dielectric Strength
The output voltage is floating and has no ohmic connection to the ground.
The output is insulated to the input by a double or reinforced insulation.
Type and routine 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 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.
It is recommend that either the (+) pole, the (–) pole 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.

Type test
60s
Factory test
5s
Field test
5s
Field test cut-off
current settings

A
2500Vac
2500Vac
2000Vac>10mA

B
3000Vac
2500Vac
2000Vac>10mA

C
1000Vac
500Vac
500Vac>20mA

D
500Vac
500Vac
500Vac>1mA

Fig. 20-1: Dielectric strength
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.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

21 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

21. Approved, Fulfilled or Tested Standards
IEC 62368

CB Scheme Certificate
IEC 62368-1 - Audio / video, information and communication technology
equipment - Safety requirements
Output safety level: ES1

IEC 61010

CB Scheme Certificate
IEC 61010-2-201 - Electrical Equipment for Measurement, Control andLaboratory Use - Particular requirements for control equipment

UL 61010

UL Certificate
Listed equipment for category NMTR - UL 61010-2-201 - Electricalequipment for measurement, control and laboratory use - Particularrequirements for control equipment
Applicable for US and Canada
E-File: E198865

Class I Div 2UL Certificate
Listed equipment for category NRAD - Industrial control equipment for
use in haradous locations
Applicable for US and Canada
E-File: E327416
Temperature code: T4
Groups: A, B, C and D

ATEX

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 17 ATEX 1 089 X
Temperature Code: T4
Type of Protection: ec nC

IECEx

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 17.0046X
Temperature Code: T4
Type of Protection: ec nC

IEC 61558-2-16(Annex BB)(only CP20.241)

Safety Isolating
Transformer

Test Certificate
IEC 61558-2-16 - Safety of transformers, reactors, power supply units
and similar products for supply voltages up to 1100 V.
Particular requirements and tests for switch mode power supply units
and transformers for switch mode power supply units.

Semi F47

Test Report
Voltage Sag Immunity for Semiconductor Processing Equipment
Tested for AC 208 V L-L or L-N mains voltages, nominal output voltage
and nominal output load

IEC 60068-2-60

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

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

22 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

ISA-71.04-1985

Manufacturer's Declaration (Online Document)
Airborne Contaminants Corrosion Test
Severity Level: G3 Harsh
H2S: 100ppb
NOx: 1250ppb
Cl2: 20ppb
SO2: 300ppb
Test Duration: 3 weeks, which simulates a service life of at least 10 years

VDMA 24364

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

22. Regulatory Product Compliance
EU Declaration ofConformity

The CE mark indicates conformance with the European

WEEE Regulation

Manufacturer's Declaration
EU Directive on Waste Electrical and Electronic Equipment Registered inGermany as business to business (B2B) products.
EU Directive 2012/19/EU
WEEE-Reg.-Nr. DE 55837529

REACH Regulation

Manufacturer's Declaration
EU Regulation regarding the Registration, Evaluation, Authorisation
and Restriction of Chemicals
EU Regulation 1907 / 2006

RoHS-China

Manufacturer's Statement
Administrative Measures for the Restriction of the Use of Hazardous
Substances in Electrical and Electronic Products 25 years

KC

KC Registration
Korean - Registration of Broadcasting and Communication Equipment
KOSHA - Korea Occupational Safety and Health Agency
Registration No. R-R-PUG-CP20_241

CCC

CCC Certificate
China Compulsory Certification (CNCA-C23-01:2019)
Certificate for devices made in Suzhou/China (PULS Electronics):
2021122303114443
Certificate for devices made in Chomutov/Czech Republic (PULS
investi#ní): 2021122303114444
CCC-Ex

UKCA

UKCA Declaration of Conformity Trade conformity assessment for
England, Scotland and Wales The UKCA mark indicates conformity with
the UK Statutory Instruments
2016 No.1101,
2016 No.1091,
2012 No.3032

–
–
–
–

EMC directive
Low-voltage directive (LVD)
RoHS directive
ATEX directive

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

23 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

23. Physical Dimensions And Weight
Width
Height
Depth

48mm
124mm
127mm
The DIN rail depth must be added to the unit depth to calculate the total required
installation depth.

Weight830g

DIN rail

Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.

Housing material

Body: Aluminium alloy
Cover: Zinc-plated steel

Installation clearances

See chapter 2.

Penetration protection

Small parts like screws, nuts, etc. with a diameter larger than 5mm

Fig. 23-1: Front
view CP20.241, -C1

Fig. 23-2: Front
view CP20.241-S1

Fig. 23-3: Front
view CP20.241-S2

Fig. 23-4: Front
view CP20.241-V1

Fig. 23-5: Side viewAll dimensions in mm unless otherwise noted.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

24 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

24. Accessories
24.1. ZM10.Wall - Wall/Panel Mount Bracket
This 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.

Fig. 24-1: Isometric viewFig. 24-2: Isometric view

51

51
9 33

Fig. 24-3: Isometric view

5.8

149

149
136

(4x)

6

135

Fig. 24-4: Wall/panel
mounting, front viewFig. 24-5: Hole pattern
for wall mounting

Fig. 24-6: Wall/panel
mounting, side viewAll dimensions in mm unless otherwise noted.

24.2. UF20.241 - Buffer Module
The UF20.241 buffer module is a supplementary device for DC 24V power
supplies. It delivers power to bridge typical mains failures or extends the holdup time after the AC power is turned off.
When the power supply provides a sufficient voltage, the buffer module
stores energy in the integrated electrolytic capacitors. When the mains
voltage is lost, the stored energy is released to the DC-bus in a regulated
process.
The buffer module can be added in parallel to the load circuit at any given
point and does not require any control wiring.
One buffer module can deliver 20A additional current and can be added inparallel to increase the output ampacity or the hold-up time.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

25 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

24.3. YR40.241 - Redundancy Module
The YR40.241 is a dual redundancy module, which can be used to build 1+1
or N+1 redundant systems.
The device is equipped with two 20A nominal input channels, which areindividually decoupled by utilizing MOSFET technology. The output can beloaded with a nominal 40A continuous current.
Using MOSFETSs instead of diodes reduces heat generation, losses andvoltage drop between input and output. Due to these advantages, the unit
is very narrow and only requires 36mm width on the DIN rail.
The device does not require an additional auxiliary voltage and is selfpowered even in case of a short circuit across the output. A feature ofthis redundancy module is a special circuit, which keeps the losses andtemperature low, even at overload and short circuit conditions up to 65A
continuous current.
See chapter 25.4 for wiring information.

24.4. YR40.242 – Redundancy Module
The YR40.242 is a dual redundancy module, which can be used to build 1+1
or N+1 redundant systems.
The device is equipped with two 20A nominal input channels, which areindividually decoupled by utilizing MOSFET technology. The output can beloaded with a nominal 40A continuous current.
Using MOSFETSs instead of diodes reduces heat generation, losses andvoltage drop between input and output. Due to these advantages, the unit
is very narrow and only requires 36mm width on the DIN rail.
The device does not require an additional auxiliary voltage and is selfpowered even in case of a short circuit across the output. It requires suitable
power supplies on the input, where the sum of the continuous short circuitcurrent stays below 26A. This is typically achieved when the power supplies
are featured with an intermittent overload behavior (HiccupPLUS Mode).
See chapter 25.4 for wiring information.

24.5. YR40.245 - Redundancy Module
The YR40.245 is a 40A single channel redundancy module, which is equippedwith 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 input of the device is decoupled by utilizing MOSFET technology.
Using MOSFETSs instead of diodes reduces heat generation, losses andvoltage drop between input and output. Due to these advantages, the unit
is very narrow and only requires 46mm width on the DIN rail.
The device does not require an additional auxiliary voltage and is selfpowered even in case of a short circuit across the output. It requires a suitable
power supply on the input, where the continuous short circuit current stays
below 22A. This is typically achieved when the power supply is featured withan intermittent overload behavior (HiccupPLUS Mode).
See chapter 25.4 for wiring information.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

26 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

25. Application Notes
25.1. Peak Current Capability
The device 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 coiland a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state current andusually exceeds the nominal output current. 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 fuseor circuit breaker need a certain amount of over-current to open in a timely manner. This avoids voltage loss in adjacentcircuits.
The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of thepower supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The following
examples show typical voltage dips for resistive loads:

Fig. 25-1: 40A peak current for
50ms , typ. (2x the nominal current)

Fig. 25-2: 100A peak current for
5ms , typ. (5x the nominal current)

Fig. 25-3: 60A peak current for
12ms , typ. (3x the nominal current)

Please note: The DC-OK relay triggers when thevoltage dips more than 10% for longer than
1ms.

Peak current voltage dips

typ.
typ.
typ.

From 24V to 16V
From 24V to 21V
From 24V to 17V

at 40A for 50ms, resistive load
at 100A for 2ms, resistive load
at 100A for 5ms, resistive load

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

27 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

25.2. 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 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 thewire 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, a fast(magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to the ridethrough 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 cross section and wire length.
Maximum wire length *) for a fast (magnetic) tripping:

Fig. 25-4: Test circuit*)

0.75mm²
31m
28m
18m
9m
6m
4m
2m
23m
11m
7m
5m
1m
-

C-2A
C-3A
C-4A
C-6A
C-8A
C-10A
C-13A
B-6A
B-10A
B-13A
B-16A
B-20A
B-25A

1.0mm²
37m
34m
25m
11m
7m
6m
2m
28m
14m
11m
6m
1m
-

1.5mm²
63m
51m
38m
18m
12m
11m
4m
46m
19m
16m
8m
2m
-

2.5mm²
98m
78m
58m
26m
14m
13m
7m
66m
32m
29m
15m
4m
1m

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

25.3. Parallel Use to Increase Output PowerPower supplies can be paralleled to increase the output power. The output
voltage of all devices shall be adjusted to the 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, set the unit to “Parallel Use”
mode, in order to achieve load sharing. The “Parallel Use” mode regulates theoutput voltage in such a manner that the voltage at no load is approx. 4% higher
than at nominal load. See also chapter 6.
The ambient temperature is not allowed to exceed +60°C.
If more than three units are connected in parallel, a fuse or circuit breaker witha rating of 30A or 32A is required on each output. Alternatively, a diode or
redundancy module can also be utilized.
Energize all units at the same time. It also might be necessary to cycle the input
power (turn-off for at least five seconds), if the output was in overload or shortcircuits and the required output current is higher than the current of one unit.
Keep an installation clearance of 15mm (left / right) between two devices andavoid installing devices on top of each other. Do not use devices in parallelin mounting orientations other than the standard mounting orientation or in
any other condition where a reduction of the output current is required (e.g.
altitude).
Pay attention that leakage current, EMI, inrush current will increase when using
multiple devices.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

28 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

25.4. Parallel Use for Redundancy
Please note that there are variants with built-in redundancy are available in the CP20 series. Check CP20.241-Rx units.
1+1 Redundancy:
Power 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 device fails. The simplest way is to put two devices in parallel. Thisis called a 1+1 redundancy. In case one device fails, the other one is automatically able to support the load current without
any interruption. It is essential to use a redundancy module to decouple devices from each other. This prevents that thedefective unit becomes a load for the other device and the output voltage cannot be maintained anymore.
1+1 redundancy allows ambient temperatures up to +70°C.
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple devices.
Recommendations for building redundant power systems:a) Use separate input fuses for each device.
b) Use separate mains systems for each device whenever it is possible.
c) Monitor the individual devices. Therefore, use the DC-OK signal of the device.
d) It is desirable to set the output voltages of all devices to the same value (± 100mV) or leave it at the factory setting.
e) Set the devices into “Parallel Use” mode.
N+1 Redundancy:
Redundant systems for a higher power demand are usually built in a N+1 method. E.g. four devices, each rated for 20A
are paralleled to build a 60A redundant system.
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple devices.
Keep an installation clearance of 15mm (left / right) between two devices and avoid installing the devices on top of eachother.
Do not use devices in parallel in mounting orientations other than the standard mounting orientation or in any othercondition, where a reduction of the output current is required.
For N+1 redundancy the ambient temperature is not allowed to exceed +60°C.
Wiring examples for 1+1 redundancy and N+1 redundancy:

Fig. 25-5: 1+1 Redundant configuration for 20A
load current with a dual redundancy module

Alternatively, the YR40.242 redundancy
module can be used but has the input andoutput terminals reversed.

Fig. 25-6: N+1 Redundant configuration for 60A load
current with multiple devices and redundancy modules

Alternatively, the YR40.242 redundancy module can be used but has the
input and output terminals reversed.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

29 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

25.5. Series Operation
Power 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 thesum of the output voltage does not exceed 150Vdc. Voltages with a potential
above 60Vdc must be installed with a protection against touching.
Avoid return voltage (e.g. from a decelerating motor or battery) which is applied
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 the standard mounting
orientation (terminals on the bottom of the unit).
Pay attention that leakage current, EMI, inrush current, harmonics will increase
when using multiple power supplies.

25.6. Charging of Batteries
The power supply can be used to charge lead-acid or maintenance free batteries. Two 12V SLA or VRLA batteries are neededin series connection.
Instructions for charging batteries:a) Use only matched batteries when putting 12V types in series.
b) Ensure that the ambient temperature of the power supply stays below +40°C.
c) Use a 32A or 30A circuit breaker (or blocking diode) between the power supply and the battery.
d) Ensure that the output current of the power supply is below the allowed charging current of the battery.
e) The return current to the power supply (battery discharge current) is typ. 3.5mA when the power supply is switchedoff (except in case a blocking diode is utilized).
f) Set the device into “Parallel Use” mode and adjust the 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
Battery temperature

27.8V
10°C

27.5V
20°C

27.15V
30°C

26.8V
40°C

25.7. Two Phases Operation
The power supply can also be operated on two phases of a three-phase-system.
Such a phase-to-phase connection is allowed as long as the supplying voltage isbelow 240V+10%.
Ensure that the wire, which is connected to the N-terminal, is appropriately
fused.
The maximum allowed voltage between a Phase and the PE must be below
300Vac.

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

30 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

25.8. 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 thanoutside. 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. For
this measurement the power supply is placed in the middle of the box, no other heat producing items are inside the box.
The temperature sensor inside the box is placed in the middle of the right side of the power supply with a distance of 1cm
to the power supply's side wall.
Case A

Case B

Enclosure size

182x180x165mm
Rittal Typ IP66 Box
PK 9519 100
plastic

182x180x165mm
Rittal Typ IP66 Box
PK 9519 100
plastic

Input voltage

230Vac

230VacLoad

24V, 16A; (=80%)

24V, 20A; (=100%)

Temperature inside the box
Temperature outside the box
Temperature rise

52°C
24°C
28K

59°C
24°C
35K

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

31 / 32

CP20.241
CP20.241-C1
CP20.241-S1

CP20.241-S2
CP20.241-V1

25.9. Mounting Orientations
Mounting orientations other than input terminals on the bottom and output on the top require a reduction in continuous
output power or a limitation in the maximum allowed ambient temperature.
The listed lifetime and MTBF values from this datasheet apply only for the standard mounting orientation.
The following curves give an indication for allowed output currents for altitudes up to 2000m.

A
Standard Orientation

B
Upside down

C
Table-top mounting

D
Horizontal cw

E
Horizontal ccw

All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
Jan. 2024 / Rev. 2.3 DS-CP20.241-xx-en

www.pulspower.com

32 / 32