CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

DC/DC CONVERTER













48V input voltage
Isolated 24V output voltage
Efficiency 94%
Width only 42mm
20% output power reserves (PowerBoost)
Full power between -25°C and +60°C
Soft-start function
Minimal inrush current surge
Reverse input polarity protection
DC OK relay contact
Parallel use for high power needs
3 year warranty

PRODUCT DESCRIPTIONSHORT-FORM DATAThe CD10.242 is a DIN rail mountable DC/DC converterof the highly reliable DIMENSION series. It provides afloating,
stabilized
andgalvanicallyseparated
SELV/PELV output voltage of 24Vdc with 48Vdc on the
input.

Output voltage
Adjustment range
Output current

The efficiency of 94% and a slim design are cost- andspace-saving. The devices also offer PowerBoost: Power
reserves of 20%, which may even be used continuously
at temperatures up to +45°C.
For even higher power needs, multiple devices can beconnected in parallel. At any time, a DC OK LED and asignal contact are informing about the status of thedevice.
High immunity to transients and power surges as well as
low electromagnetic emission makes this DC/DC
converter suitable for nearly every situation.

ORDER NUMBERS

PowerBoost

Input voltage
Input current
Input inrush current
Efficiency
Power losses
Hold-up time
Temperature range
Size (W x H x D)
WeightDC 24V
Nominal24 - 28V
Factory setting 24.1V
10.0 - 8.6A
Up to +60°C ambient
7.5 - 6.5A
At +70°C ambient
Derate linearly between +60°C and
+70°C
12A
Up to +45°C ambient
Linear decrease to nominal power
between +45°C and +60°C
DC 48V±25%
5.4A
9ApeakAt 40°C, cold start94%
At 24V, 10A
15.4W
At 24V, 10A
7ms-25°C to +70°C
42x124x117mm Without DIN rail
520g

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

DC/DC Converter
CD10.242
Accessories

ZM10.WALL Wall/panel mount bracket
ZM12.SIDE Side mount bracket

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

INDEX
Page
1. Intended Use .......................................................3
2. Installation Instructions ......................................3
3. DC-Input...............................................................5
4. Input Inrush Current ...........................................7
5. Soft-start Feature ................................................7
6. Output .................................................................8
7. Hold-up Time .......................................................9
8. DC OK Relay Contact.........................................10
9. Efficiency and Power Losses..............................11
10. Functional Diagram...........................................12
11. Front Side and User Elements ...........................12
12. Terminals and Wiring ........................................13
13. Lifetime Expectancy ..........................................14
14. MTBF ..................................................................14
15. EMC ....................................................................15
16. Environment ......................................................16
17. Safety and Protection Features ........................17
18. Dielectric Strength ............................................18Page
19. Approved, Fulfilled or Tested Standards......... 19
20. Regulatory Product Compliance ...................... 19
21. Physical Dimensions and Weight ..................... 20
22. Accessories ........................................................ 21
22.1. ZM10.Wall - Wall/Panel Mount Bracket .. 21
22.2. ZM12.SIDE - Side Mount Bracket ............. 2222.3. UF20.241 Buffer Module .......................... 23
22.4. YR40.241 - Redundancy Module .............. 23
23. Application Notes ............................................. 24
23.1. Peak Current Capability ........................... 24
23.2. Output Circuit Breakers............................ 25
23.3. Charging of Batteries ............................... 25
23.4. Series Operation ....................................... 26
23.5. Parallel Use to Increase Output Power .... 26
23.6. Parallel Use for Redundancy .................... 27
23.7. Use in a Tightly Sealed Enclosure ............ 28
23.8. 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 (available underwww.pulspower.com).
No part of this document may be reproduced or utilized in any form without our prior permission in writing.

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

Earth, Ground

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

t.b.d.

To be defined, value or description will follow later.

DC 48VA figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)

48Vdc

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

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.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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CD10.242
CD-Series

DC/DC Converter 48V/24V, 10A, 240W

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

2. INSTALLATION INSTRUCTIONSWARNING

Risk of electrical shock, fire, personal injury or death.
- Turn power off before working on the device and protect against inadvertent re-powering.
- Do not open, modify or repair the device.
- Use caution to prevent any foreign objects from entering into the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
- Do not touch during power-on, and immediately after power-off. Hot surface may cause burns.
Obey the following installation requirements:
This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to
the factory for inspection.
Install 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 protection of IP20. The enclosure does not provide protection against
spilled liquids. The isolation of the devices is designed to withstand impulse voltages up to 1.5kV according to IEC
60664-1.
The input can be powered from batteries or similar DC sources. The voltage between the input terminals and groundmust not exceed 60Vdc continuously. The input must be powered from a PELV or SELV source or an "Isolated
Secondary Circuit" in order to maintain a SELV or PELV output.
Check for correct input polarity. The device will not operate when the voltage is reversed. A disconnecting means shallbe provided for the input of the device.
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 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 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 withless than 50%, the 5mm can be reduced to zero.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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CD10.242
CD-Series

DC/DC Converter 48V/24V, 10A, 240W

The device is designed, tested and approved for branch circuits up to 50A without additional protection device. If an
external fuse is utilized, do not use circuit breakers smaller than 16A B- or C-Characteristic to avoid a nuisance trippingof 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.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

3. DC-INPUT
The input can be powered from batteries or similar DC sources and must be a PELV or SELV source or an "Isolated
Secondary Circuit" in order to maintain a SELV or PELV output.
Check for correct input polarity. The device will not operate when the voltage is reversed.
DC input
DC input range
Allowed voltage between input
and earth/ground
Allowed input ripple voltagenom.

Turn-on voltage
Shut-down voltage
Input current

typ.
typ.
typ.
typ.
typ.
typ.

max.

max.
typ.

External input protection
Fig. 3-1 Input voltage range

Fig. 3-2 Turn-on behavior, definitions

Input
Voltage

Rated input range

Turn-on

OutputVoltage

60V

VIN

35V
36V

32V

Shut-down

POUT

According to IEC 62477-1

In the frequency range from 47 to 500Hz, the momentary
input voltage must always be within the specified limits.
35Vdc
Steady-state value, see Fig. 3-1
32Vdc
Steady-state value, see Fig. 3-1
5.4A
At 48Vdc input and 24V, 10A output load, see Fig. 3-3
7.5A
At 36Vdc input and 24V, 10A output load, see Fig. 3-3
200ms
See Fig. 3-2
At 24V, 10A constant current load, 0mF load capacitance, see
150ms
Fig. 3-2
At 24V, 10A constant current load, 5mF load capacitance, see
250ms
Fig. 3-2
500mV
See Fig. 3-2
Installed inside the device, external capacitors on the input
1 650µF
are allowed without any limitations.
See recommendations in chapter 2.

max.

typ.
Turn-on overshootInput capacitance

±25%

- 5%
Start-up
delay

Rise
Time

OvershootStart-up delay
Rise time

DC 48V
36-60Vdc
60Vdc or42.2Vac
10Vpp

Fig. 3-3 Input current vs. output load

Input Current,typ.

9A

t : 36
Inpu

6

Vdc
t: 48
Inpu

3
0 2

Vdc

3

4

5

6

7

8

9 10 11 12A

Output Current

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

Requirements for the Supplying Source
In certain circumstances, the input filter of the DC/DC converter can show a resonant effect which is caused by the
supplying network. Especially when additional external input filters are utilized, a superimposed AC voltage can begenerated on the input terminals of the DC/DC converter which might cause a malfunction of the unit. Therefore,
additional input filters are not recommended. To avoid the resonant effects, the minimal resistance of the supplying
network which depends on the inductance of the input network, shall be above the boundary curve in Fig. 3-4.
Fig. 3-4 External input filter requirements toavoid filter instabilities
Resistance of the
supplying network

1 Ohm
100 mOhm(a)(b)

10 mOhm(a) max.
(b) typ.

1 mOhm
0.1mH

1mH

10mH

Inductance of the supplying network

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

6/29

CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

4. INPUT INRUSH CURRENT
An active inrush limitation circuit (inrush limiting NTC resistor which is bypassed by a MOSFET) 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.
typ.
max.

9Apeak8Apeak
7Apeak
1A2s

At 40°C ambient, cold start
At 40°C ambient, cold start
At 25°C ambient, cold start
At 40°C ambient, cold startFig. 4-1 Typical input inrush current behavior at nominal load and 25°C
ambient

Input:
Output:Ambient:

48Vdc
24V, 10A, constant current load
25°C

Input current
2A / DIV
Input voltage
20V / DIV
Output voltage 10V / DIVTime basis:
200ms / DIV

5. SOFT-START FEATURE
After the DC/DC converter is turned on, the internal output current rises slowly to its nominal value. This methodcharges the output capacitors (internal and external capacitors) slowly and avoids high input currents during turn-on.
High input currents can produce a high voltage drop on the input wiring (especially with long and thin cables) which
reduces the terminal voltage on the DC/DC converter. If the terminal voltage is below the shut-down voltage, theDC/DC converter will turn-off and will make a new start-up attempt. This effect is avoided with the integrated softstart function. Please note that this function increases the rise time of the output voltage by a small amount.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

7/29

CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

6. OUTPUT
The output provides a SELV/PELV rated voltage, which is galvanically isolated from the input voltage and is designed
to supply any kind of loads, including unlimited capacitive and inductive loads.
The output is electronically protected against overload, no-load and short-circuits. In case of a protection event,
audible noise may occur.
Output voltage
Adjustment range

nom.

24V
24-28V
30V

max.

Factory settingLine regulation
Load regulation
Ripple and noise voltage
Output current

PowerBoost*)

Overload behavior
Short-circuit current
Output capacitanceBack-feeding loads

This is the maximum output voltage which can occur
at the clockwise end position of the potentiometer due totolerances. It is not a guaranteed value which can be achieved.
24.1V±0.2%, at full load, cold unit
max.
25mV
Between 36 and 60Vdc input voltage variation
max.
100mV
In “single use” mode: static value, 0A  10A, see Fig. 6-2
typ.
1000mVIn “parallel use” mode: static value, 0A  10A, see Fig. 6-2
max.
100mVpp
Bandwidth 20Hz to 20MHz, 50Ohm
nom.
10A
At 24V and up to +60° ambient temperature
nom.
7.5A
At 24V and +70° ambient temperature
nom.
8.6A
At 28V and up to +60° ambient temperature
nom.
6.5A
At 28V and +70° ambient temperature
Derate linearly between +60°C and +70°C, see chapter 16
12A
nom.
At 24V and up to +45°C ambient temperature
10.3A
nom.
At 28V and up to +45°C ambient temperaturePowerBoost decreases linearly to nominal power between +45°C and +60°C, see chapter 16
Continuous current
max.
16A
Continuous current, short circuit impedance typ. 100mOhm
typ.
4 500µF
Included inside the power supply
The unit is resistant and does not show malfunctioning when amax.
35V
load feeds back voltage to the power supply. It does notmatter whether the power supply is on or off. The absorbing
energy can be calculated according to the built-in large sized
output capacitor.

*) PowerBoost
This power/ current is continuously allowed up to an ambient temperature of +45°C.
Above +45°C, do not use this power or current longer than a duty cycle of 10% and/or not longer than 1 minute every 10 minutes.
Fig. 6-1 Output voltage vs. output current at
48Vdc input voltage, typ.

Fig. 6-2 Current limitation vs. input voltage,(23V constant voltage load), typ.

Output Vol tage

Output Current

28V
24
20
16
12
8
4
0

Adjustment
Range

Output Current

0

2

4

6

8

10

12

14 16A

14A
13.5
13.0
12.5
12.0
11.5
11.0
10.5
10.0

Input V oltage

36

40

44

48

52

56 60Vdc

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

7. HOLD-UP TIME
The input side of the DC/DC converter is equipped with a bulk capacitor which keeps the output voltage alive for acertain period of time when the input voltage dips or is removed. The bulk capacitor can be discharged by loading the
DC/DC converter on the output side or through a load which is parallel to the input. There is no protection in the
DC/DC converter which prevents current from flowing back to the input terminals. If prevention is needed, an external
diode should be used.
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.

14ms
11ms
7ms
5ms

At 48Vdc input voltage, 24V, 5A output, see Fig. 7-1
At 48Vdc input voltage, 24V, 5A output, see Fig. 7-1
At 48Vdc input voltage, 24V, 10A output, see Fig. 7-1
At 48Vdc input voltage, 24V, 10A output, see Fig. 7-1

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

Hold-up Time(a)18ms (a) 24V, 5A, typ.
15(b)(b) 24V, 5A, min.
(c) 24V, 10A, typ.
(d) 24V, 10A, min.

(c)

12

(d)

9
6
3

Input Voltage

0
36

40

44

48

52

56 60Vdc

Fig. 7-2 Shut-down test setup

S1

+

DC
Source-DC/DC
Converter
Input+

IntputVoltage

S1 opens+

CD10
Output -Fig. 7-3 Shut-down behavior, definitions

Load

-

- 5%

OutputVoltage
Hold-up TimeMar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/29

CD10.242
CD-Series

DC/DC Converter 48V/24V, 10A, 240W

8. DC OK RELAY CONTACT
This function monitors the output voltage supplied by the individual power supply unit itself without consideration ofother sources connected in parallel to this unit.
Threshold voltage
Contact closes
Contact opens
Contact ratings
Isolation voltage

typ.
21V (fixed)
As soon as the output voltage reaches 21V.
As soon as the output voltage falls below 21V.
Maximal 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A, resistive load
Minimal permissible load 1mA at 5Vdc
See dielectric strength table in chapter 18.

Fig. 8-1 DC OK relay contact behavior

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

10/29

CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

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

*)

typ.
typ.
typ.

DC 48V
94.0%
93.5%
93.8%

typ.
typ.
typ.
typ.

1.4W
7.5W
15.4W
20W

At 24V, 10A
At 24V, 12A (PowerBoost)At 25% at 2.5A, 25% at 5A,
25% at 7.5A. 25% at 10A
At no output load
At 24V, 5A
At 24V, 10A
At 24V, 12A (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 at 24V, typ.

Fig. 9-2

Losses vs. output current at 24V, typ.

Fig. 9-3

Efficiency vs. input voltage at 48V, 10A,
typ.

Fig. 9-4

Losses vs. input voltage at 48V, 10A, typ.

Efficiency

94.5%
94.0
93.5
93.0
92.5
92.0
36

40

44

48

52

56

60Vdc

Input Voltage

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

11/29

CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

10. FUNCTIONAL DIAGRAM
Fig. 10-1 Functional diagram
Link for
Parallel Use

OutputVoltage
Regulator

VOUT

+
PE

Input
Fuse
&
Input
FilterReversePolarity
Protection&
InrushLimiter

Output OverVoltage Protection

Power
Converter

OutputVoltage
Monitor

OutputFilter

DC OK
Relay

+
DC Ok
Contact
DC Ok
LED

11. FRONT SIDE AND USER ELEMENTS
Fig. 11-1 Front side

A

B1

B2

C
D
E

Input terminals+ Positive input- Negative input
PE --> Protective Earth (Ground) connection
Output terminals
Single terminal for the positive pole and dual terminals for thenegative pole. Both negative poles are internally connected.
+ Positive output- Negative (return) output
DC OK relay contact
The DC OK relay contact is synchronized with the DC OK LED.
See chapter 8 for details.
Output voltage potentiometer
DC OK LED (green)
The LED is on, when the output voltage is above 21V.
“Parallel Use” “Single Use” link
Link the two terminal poles when outputs of devices areconnected in parallel. In order to achieve a sharing of the load
current between the individual devices, the “parallel use”
regulates the output voltage in such a manner that the voltage
at no load is approx. higher than at nominal load.
See chapter 23.5 for details.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

12/29

CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-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 (including
ferrules)Recommended tightening
torqueWire stripping length
Screwdriver

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

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

Signal terminal
Push-in terminal
Max. 1.5mm2Max. 1.5mm2
24-16 AWG

2.8mm

2.8mm

1.6mm

1Nm

1Nm

-

7mm
3.5mm slotted or Phillips
No 1

7mm
3.5mm slotted or Phillips
No 1

7mm
3mm slotted to open
the spring

Daisy chaining of outputs:
Daisy chaining (jumping from one DC/DC-converter output to the next) is allowed as long as the average output
current through one terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal
block.
Fig. 12-1 Daisy chaining of outputs

Fig. 12-2 Using distribution terminals

max 25A!
Output+ + - -

Output+ + - -

DC/DC
Converter
Input

+

-

Output+ + - -

Output+ + - -

DC/DC
Converter

DC/DC
Converter

DC/DC
Converter

Input

Input

Input

Load

+

-

Load

Distribution
Terminals

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

13/29

CD10.242
DC/DC Converter 48V/24V, 10A, 240W

CD-Series

13. LIFETIME EXPECTANCYThe 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 andis 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

Input 48Vdc
275 000h
117 000h
70 000h
788 000h
327 000h
197 000h

At 24V, 5A and 40°C
At 24V, 10A and 40°C
At 24V, 12A and 40°C
At 24V, 5A and 25°C
At 24V, 10A and 25°C
At 24V, 12A and 25°C

14. 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 life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h
means that statistically one unit will 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.
For these types of units the MTTF (Mean Time To Failure) value is the same value as the MTBF value.

MTBF SN 29500, IEC 61709
MTBF MIL HDBK 217F

Input 48Vdc
765 000h
1 363 000h
358 000h
403 000h
66 000h90 000h

At 24V, 10A and 40°C
At 24V, 10A and 25°C
At 10A and 40°C; Ground Benign GB40
At 10A and 25°C; Ground Benign GB25
At 10A and 40°C; Ground Fixed GF40
At 10A and 25°C; Ground Fixed GF25

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

15. EMCThe EMC behavior of the device is designed for applications in industrial environment as well as in residential,commercial and light industry environments.
The device is investigated according to the generic standards EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN IEC 61000-68 and EN 61000- 6-4.
EMC Immunity
Electrostatic discharge

Power lines and housing
Contact discharge
EN 61000-4-2
Air discharge
EN 61000-4-3
80MHz-2.7GHz
2.7GHz-6.0GHz
Input lines
EN 61000-4-4
Output lines
EN 61000-4-5++/-  chassis ground+EN 61000-4-5+ / -  chassis groundEN 61000-4-6
0.15-80MHz

8kV
15kV
20V/m
10V/m
4kV
2kV
1kV
2kV
500V
1kV
20V

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A

DC OK signal lines
EN 61000-4-3
80MHz-2.7GHz
2.7GHz-6.0GHz
EN 61000-4-4
DC OK lines with coupling clamp

20V/m
10V/m

Criterion A
Criterion A

2kV

Criterion A

Surge

EN 61000-4-5

DC OK lines  chassis ground

1kV

Criterion A

Conducted disturbanceEN 61000-4-6

0.15-80MHz

20V

Criterion A

Electromagnetic RF field
Fast transients (Burst)
Surge voltage on input
Surge voltage on output
Conducted disturbance

EMC Immunity
Electromagnetic RF field
Fast transients (Burst)

Criterion
A: The device shows normal operation behavior within the defined limits.

EMC Emission
Conducted emission on
input lines
Conducted emission on
output lines

Limits for DC power networks
according to EN 61000-6-3
fulfilled
Limits for DC power networks
according EN IEC 61000-6-8
fulfilledClass B

IEC/CISPR 16-1-2, IEC/CISPR 16-2-1

IEC/CISPR 16-1-2, IEC/CISPR 16-2-1

Radiated emission
EN 55011, EN 55032
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 Frequency
Main converter

15kHz to 500kHz

Output load and input voltage dependentMar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

16. ENVIRONMENTThe operational temperature is the ambient or
surrounding temperature and is defined as the
air temperature 2cm below the device.
-40°C to +85°C
For storage and transportation
3.2W/°C
Between +45°C and +60°C
6W/K
Between +60°C and +70°C
15W/1000m or 5K/1000m
For altitudes >2000m, see Fig. 16-2
9W/-5kPa or 3K/-5kPa
For atmospheric pressures <80kPa, see Fig. 16-2
The derating is not hardware controlled. The customer has to take care by himself tostay below the de-rated current limits in order not to overload the unit.
5 to 95% r.h.
According to IEC 60068-2-30
110-47kPa
See Fig. 16-2 for details
Up to 5000m
See Fig. 16-2 for details
2
According to IEC 62477-1, not conductive
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
According to IEC 60068-2-6
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 according to EN 60715 with aheight of 15mm and a thickness of 1.3mm and standard orientation.
Some audible noise may be emitted from the power supply during no load, overload or
short circuit.

Operational temperature-25°C to +70°C

Storage temperature
Output derating

Humidity
Atmospheric pressure
AltitudeDegree of pollution
Vibration sinusoidal
Shock

Audible noise

Fig. 16-1 Output current vs. ambient temp.
(Inom 10A; Iout with PowerBoost = 12A)

Allowed Output Current at 24V

Allowed Output Current at 24V

12A

12A
B

A

10A

A... Continuous
B... Short term

6A
4A
0
-25

C
B

10A

A

8A

8A

2A

Fig. 16-2 Output current vs. altitude

6A
4A
2A

Ambient Temperature

0

20

40

60 70°C

A... Ambient < 60°C
B... Ambient < 45°C
C... Short term

Altitude 0mAP*) 110kPa

2000m
80kPa

*) Atmospheric pressure

4000m
62kPa

6000m
47kPa

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

17. SAFETY AND PROTECTION FEATURES
Isolation resistancemin.

500MOhmmin.

500MOhmmin.

500MOhmmin.

500MOhm

PE resistancemax.

0.1OhmOutput over-voltage protection

typ.
max.

Class of protection
Degree of protection
Over-temperature protection
Input transient protection
Internal input fuse
Touch current (leakage current)

At delivered condition between input and output,
measured with 500Vdc
At delivered condition between input and Chassis
Ground, measured with 500Vdc
At delivered condition between output and Chassis
Ground, measured with 500Vdc
At delivered condition between output and DC OK
contacts, measured with 500Vdc
Resistance between PE terminal and the housing in
the area of the DIN rail mounting bracket.

31Vdc
32.5Vdc
In case of an internal defect, a redundant circuit limits the maximum
output voltage. The output shuts down and automatically attempts torestart.
I
According to IEC 61140
IP 20
According to EN/IEC 60529
Not included
MOV (Metal
For protection values see chapter 15 (EMC).
Oxide Varistor)
Not user replaceable slow-blow high-braking
Includedcapacity fuse
The leakage current, which is produced by the DC/DC converter itself, depends on
the input voltage ripple and need to be investigated in the final application.
For a smooth DC input voltage, the produced leakage current is less than 100µA.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

18. 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 theappropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all inputterminals 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.
We recommend that either the (+) pole or the (-) pole shall be connected to the protective earth system. This helps to
avoid situations in which a load starts unexpectedly or cannot be switched off when unnoticed earth faults occur.

Type test

60s

A
1500Vac

B
1500Vac

C
500VacD
500VacRoutine test

5s

1500Vac

1500Vac

500Vac

500VacField test

5s

1000Vac

1000Vac

500Vac

500Vac

>20mA

>10mA

>80mA

>1mA

Fig. 18-1 Dielectric strength

Field test cut-off
current settingB*) When testing input to DC OK ensure that the maximal 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.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

19. APPROVED, FULFILLED OR TESTED STANDARDSVDMA 24364

Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364-C1L/W for solvents and water-based paints

20. REGULATORY PRODUCT COMPLIANCE
EU Declaration ofConformity
REACH Regulation (EU)

WEEE Regulation

The CE mark indicates conformance with the- EMC directive- RoHS directive
Manufacturer's Statement
EU regulation regarding the Registration, Evaluation,
Authorisation and Restriction of Chemicals (REACH) fulfilled.
Manufacturer's Declaration
EU Regulation on Waste Electrical and Electronic Equipment
Registered as business to business (B2B) products.
EU Regulation 2012/19/EU

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD-Series

DC/DC Converter 48V/24V, 10A, 240W

21. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth

WeightDIN rail
Housing material
Installation clearances

42mm
124mm
117mm
The DIN rail depth must be added to the unit depth to calculate the total required
installation depth.
520g
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Body: Aluminium alloy
Cover: Zinc-plated steel
See chapter 2

Fig. 21-1 Front viewFig. 21-2 Side viewAll dimensions in mm

All dimensions in mm

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

22. ACCESSORIES
22.1. 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.
Fig. 22-1 Isometric viewFig. 22-2 Isometric viewFig. 22-3 Isometric viewFig. 22 4 Wall/panel mounting, frontview

Fig. 22 5 Hole pattern for wall
mounting

Fig. 22-6 Wall/panel mounting, side viewAll dimensions in mm

All dimensions in mm

All dimensions in mm

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

22.2. ZM12.SIDE - SIDE MOUNT BRACKETThis ZM12.SIDE bracket is used to mount the device sideways with or without utilizing a DIN rail tosave installation depth.
The two aluminum brackets and the black plastic slider of the unit have to be detached, so that theZM12.SIDE steel bracket can be mounted.
For sideway DIN rail mounting, the removed aluminum brackets and the black plastic slider need to be
mounted on the ZM12.SIDE steel bracket.
PSU for illustration purpose only.
Fig. 22-7 Side mounting
without DIN rail brackets

Fig. 22-8 Side mounting with
DIN rail brackets

Fig. 22-9 Hole pattern

All dimensions in mm

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

22/29

CD10.242
CD-Series

DC/DC Converter 48V/24V, 10A, 240W

22.3. UF20.241 BUFFER MODULEThe UF20.241 buffer module is a supplementary device for 24V DC/DC converters. It
delivers power to bridge typical supply voltage faults or extends the hold-up time after
the input power is turned off.
When the DC/DC converter provides a sufficient voltage, the buffer module storesenergy in the integrated electrolytic capacitors. When the input voltage is lost, thestored 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 anddoes not require any control wiring.
One buffer module can deliver 20A additional current and can be added in parallel toincrease the output ampacity or the hold-up time.
For longer hold-up times the UF40.241 might also be an option.

22.4. YR40.241 - REDUNDANCY MODULEThe 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 are individually
decoupled by utilizing MOSFET technology. The output can be loaded with a nominal
40A continuous current.
Using MOSFETSs instead of diodes reduces heat generation, losses and voltage 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 self-powered even incase of a short circuit across the output.
A feature of this 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 12 for wiring information.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

23. APPLICATION NOTES
23.1. PEAK CURRENT CAPABILITY
The unit can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents.
This helps to start current demanding loads. Solenoids, contactors and pneumatic modules often have a steady state
coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state
current and usually exceeds the nominal output current. 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 loadbranches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch
circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids
voltage loss in adjacent circuits.
The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of
the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The
following two examples show typical voltage dips:
Fig. 23-1 20A Resistive peak load (2x the nominal
current) for 50ms, typ.

Peak current voltage dips

typ.
typ.
typ.

from 24V to 14V
from 24V to 12V
from 24V to 6V

Fig. 23-2 50A Resistive peak load (5x the nominal
current) for 5ms, typ.

at 20A for 50ms, resistive load
at 50A for 2ms, resistive load
at 50A for 5ms, resistive load

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

23.2. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCBs) are commonly used for AC supply systems, but can also be used in DC
branches if specified.
Such MCBs are designed to protect wires and circuits. When the ampere rating and characteristics of the MCB arematched to the wire size used, the wiring is considered thermally safe whether the MCB opens or not.
To avoid voltage dips and undervoltage situations in adjacent DC branches fed by the same source, fast (magnetic)
tripping of the MCB is desirable. For example, a fast trip within 10ms avoids a shutdown and restart of the PLC. For thispurpose, power supplies with high current reserves and large output capacitors are advantageous. In addition, theimpedance of the faulty circuit must be sufficiently small so that the current can actually flow. The best current
reserves of a power supply are of no help if Ohm's law does not allow the current to flow.
The following table provides typical test results showing which MCBs magnetically trip as a function of wire size andlength. The lengths given correspond to the total length, which is the sum of the outgoing (+) and return (-) wire. The
tests were performed without additional load.
Fig. 23-3 Test circuit for maximum wire length

DC/DC
Converter

DC

MCB

Load

+

+
Wire length

S1-

DC S1... Fault simulation switch

Test results for maximum wire length:

C-2A
C-3A
C-4A
C-6A
C-8A
B-6A
B-10A

0.75mm²
23m
14m
8m
2m
0m
11m
2m

1.0mm²
32m
18m
9m
2m
1m
13m
2m

1.5mm²
43m
26m
14m
4m
1m
21m
4m

2.5mm²
62m
39m
18m
6m
1m
29m
4m

B-13A

1m

1m

1m

2m

23.3. CHARGING OF BATTERIESThe device can be used to charge lead-acid or maintenance free batteries. Four 12V SLA or VLRA batteries are neededin series connection.
Instructions for charging batteries:a)Ensure that the ambient temperature of the Device is below 45°C.

b)

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

c)End-of-charge voltage

27.8V

27.5V

27.15V

26.8V

Battery temperature

10°C

20°C

30°C

40°C

Use a 16A circuit breaker or blocking diode between the Device and the battery.

d)Ensure that the output current of the Device is below the allowed charging current of the battery.

e)

Use only matched batteries when putting 12V types in series.

f)

The return current to the device (battery discharge current) is typ. 10mA when the Device is switched off except
in case a blocking diode is utilized.

g)

Do not use the devices for battery charging in 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).

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
CD-Series

DC/DC Converter 48V/24V, 10A, 240W

23.4. SERIES OPERATION
Devices 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 a potential above
60Vdc must be installed with a protection against touching.
Avoid return voltage (e.g. from a decelerating motor or battery) which isapplied to the output terminals.

Unit A
Input

OutputUnit B

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.

Input

Output

+
Load

-

+

+

-

-

Pay attention that EMI and inrush current will increase when using multiple devices.

23.5. PARALLEL USE TO INCREASE OUTPUT POWER
Devices can be paralleled to increase the output power. The output voltage of all
power supplies 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 thefactory settings. After the adjustments, set the unit to “Parallel Use” mode, inorder to achieve load sharing. The “Parallel Use” mode regulates the output
voltage in such a manner that the voltage at no load is approx. 4% higher thanat nominal load. See also chapter 6.

Unit A
Input

OutputUnit B
Input

+
+
-

The ambient temperature is not allowed to exceed +60°C.
If more than three devices are connected in parallel, a diode, fuse or circuit
breaker with a rating of 15A or 16A is required on each output. Alternatively, a
diode or redundancy module can also be utilized.

OutputLoad+-

Keep an installation clearance of 15mm (left / right) between two devices and avoid installing devices on top of eachother. Do not use devices in parallel in 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.

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

23.6. PARALLEL USE FOR REDUNDANCY
1+1 Redundancy:
Devices 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.
This is 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 the defective unit becomes a load for the other device and the output voltage cannot be maintained any
more.
1+1 redundancy allows ambient temperatures up to +70°C.
Pay attention that EMI and inrush current will increase when using multiple devices.
Recommendations for building redundant power systems:- Use separate input fuses for each device.
- Use separate supply systems for each device whenever it is possible.
- It is desirable to set the output voltages of all devices to the same value (± 100mV) or leave it at the factory setting.
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 10A
are paralleled to build a 30A redundant system.
Pay attention that EMI and inrush current will increase when using multiple devices.
Keep an installation clearance of 15mm (left / right) between two devices and avoid installing the devices on top ofeach other.
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 +45°C.
Wiring examples for 1+1 and N+1 redundancy:
Fig. 23-4 1+1 Redundant configuration for 10A
load current

Fig. 23-5 N+1 Redundant configuration for 30A load current
with multiple DC/DC converters and redundancy modules

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

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23.7. USE IN A TIGHTLY SEALED ENCLOSURE
When the DC/DC Converter is installed in a tightly sealed enclosure, the temperature inside the enclosure will behigher than outside. In such situations, the inside temperature defines the ambient temperature for the DC/DC
Converter.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The DC/DC Converter 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 DC/DC Converter with a distanceof 1cm.
Enclosure size

Input voltage
Load
Temperature inside the box
Temperature outside the box
Temperature rise

Case A
110x180x165mm
Rittal Typ IP66 Box
PK 9516 100,plastic
48Vdc
24V, 8A; (=80%)
45.4°C
21.0°C
24.4K

Case B
110x180x165mm
Rittal Typ IP66 Box
PK 9516 100,plastic
48Vdc
24V, 10A; (=100%)
52.4°C
21.0°C
31.4K

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W

CD-Series

23.8. MOUNTING ORIENTATIONSMounting orientations other than input terminals on the bottom and output on the top require a reduction incontinuous 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.
Fig. 23-6
Mounting
Orientation A(Standardorientation)

Allowed Output Current at 24V

12A
10A

OUTPUT

7.5A

DC/DC
Converter

0

INPUT

+45

+60 +70°C

Ambient Temperature

Fig. 23-7
Mounting
Orientation B(Upside down)

Allowed Output Current at 24V

12A

INPUT

7.5A

DC/DC
Converter

0

OUTPUT

Fig. 23-8
Mounting
Orientation C(Table-top
mounting)+60 +70°C

Ambient Temperature

Allowed Output Current at 24V

12A
6.5A
0

Fig. 23-9
Mounting
Orientation D(Horizontal cw)+25+60 +70°C

Ambient Temperature

Allowed Output Current at 24V

12A
OUTPUT

DC/DC
Converter

INPUT

6.5A
0

+25

+60 +70°C

Ambient Temperature

Allowed Output Current at 24V

INPUT

DC/DC
Converter

12A
OUTPUT

Fig. 23-10
Mounting
Orientation E(Horizontal ccw)

+30

6.5A
0

+25

+60 +70°C

Ambient Temperature

Mar. 2024 / Rev. 1.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
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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