XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

SEMI-REGULATED POWER SUPPLY
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GENERAL DESCRIPTION

Alternative or Replacement for AC Transformer
Three Phase Input – DC Output
DIN-Rail Mountable
Width only 96mm
95.5% Efficiency
125% Peak Power Capability
No Input Inrush Current
Active Input Transient Blocker
Full Power Between -25°C and +60°C
Easy Failure Diagnostics
No Electrolytic Capacitors on Input Side
Cost Effective and Robust
3 Year Warranty

SHORT-FORM DATA
Output voltage

The power supplies in the Dimension X-Series include
a new and innovative concept for generating an
isolated DC voltage from a three-phase mains
system.
A semi-regulated resonant converter enables a very
compact design, maximum efficiency and extremelycompetitive pricing with only a small compromise in
the output voltage regulation, output ripple andhold-up time.
Weighing just 1.4 kg, the device provides 960 wattsof continuous output power and an additional 25%
power reserve for dynamic loads. The light-weight
design along with compact dimensions facilitatestraightforward mounting on DIN-rail.
Primary use are applications involving supplies tomotors, valves and other load circuits with a highpower consumption, where an accurate output
voltage regulation which is standard on traditionalswitched-mode power supplies is not required.
Furthermore, these switched-mode power supplies
can often replace mains transformers with rectifiers.

ORDER NUMBERS
Power Supply
AccessoryDC 24V

Adjustment range
Output current

none
40A
50A
Output power
960W
1200W
Output ripple< 1500mVpp< 200mVpp
Input voltage
3AC 400V
3AC 480V
Mains frequency
50-60HzAC Input current
1.65A / phase
1.4A / phase
Power factor
0.93
AC Inrush current
typ. 2A peak
Efficiency
95.5%
Losses
45.2W
Temperature range -25°C to +70°C
Derating
24W/°C
Dimensions
96x124x159mm

Factory setting to
24.1V
continuous
for typ. 15s
continuous
for typ. 15s
20Hz-2kHz
2kHz to 20MHz
XT40.241
XT40.242±6%
XT40.241, 3x400V
XT40.242, 3x480V
24V, 40A

operational+60 to +70°C
WxHxD

MARKINGS

XT40.241

400V Input

XT40.242

480V Input

UF20.241

24V Buffer Unit

SLR01

Redundancy Module

UL 508

UL 60950-1

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

IEC 60950-1

1/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

INDEX

PAGE

1. Intended Use .......................................................3
2. Installation Instruction ........................................3
3. AC-Input...............................................................4
4. Input Inrush Current ...........................................5
5. Output .................................................................6
6. Hold-up Time .......................................................7
7. Efficiency and Power Losses................................8
8. Functional Diagram.............................................99. Front Side and User Elements .............................910. Terminals and Wiring ........................................10
11. Reliability ...........................................................10
12. EMC ....................................................................11
13. Environment ......................................................12
14. Protection Features ...........................................13
15. Safety .................................................................13
16. Dielectric Strength ............................................13
17. Approvals and Fulfilled Standard .....................14
18. Regulatory Compliance .....................................14
19. Physical Dimensions and Weight ......................15

INDEX

PAGE

20. Installation and Operation Instructions .......... 15
21. Accessories ........................................................ 16
22. Comparison between the XT40, a Transformer
and a Traditional Switched-mode Power Supply .. 16
23. Application Notes ............................................. 17
23.1. Periodical Peak Power Capability .......... 17
23.2. Charging of Batteries ............................. 17
23.3. Output Circuit Breakers ......................... 18
23.4. External Input Protection....................... 19
23.5. Back-feeding Loads ................................ 19
23.6. Parallel Use to Increase Output Power . 19
23.7. Parallel Use for Redundancy .................. 19
23.8. Series Operation ..................................... 20
23.9. Inductive and Capacitive Loads ............. 20
23.10. Loss of One Input Phase ......................... 20
23.11. Use in a Tightly Sealed Enclosure .......... 20
23.12. Mounting Orientations .......................... 21

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.

3AC 400V

A figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances (usually ±15%) included. 3AC means three phase input.
E.g.: DC 12V describes a 12V battery disregarding whether it is charged (13.7V) or
discharged (10V)As long as otherwise stated, 3AC 400V parameters are valid at 50Hz and 3AC 480V
parameters are valid at 60Hz mains frequency.

3x 400Vac

A figure with the unit (Vac) at the end is a value which is used during testing without any
additional tolerances included. 3x 400Vac means a three phase input.

DISCLAIMER
The information presented in this document is believed to be accurate and reliable and may change without notice.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

2/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

1. INTENDED USEThis device is designed for installation in an enclosure and is intended for commercial use such as in industrial control,
process control, monitoring and measurement equipment or the like. The principal use are applications such as
motors, valves and other load circuits with high power consumption, where an accurate output voltage regulationand low amount of ripple voltage (standard on switch mode power supplies) is not required.
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 INSTRUCTION
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. Use ferrules for wires on the input terminals.
Unused screw terminals should be securely tightened.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The housing 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
terminal and the PE potential must not exceed 400Vac. The device is not designed to be used on corner groundeddelta systems.
A disconnecting means shall be provided for the input of the device.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do
not cover ventilation grid!
The device is designed for altitudes up to 5000m (16400ft). Above 2000m (6560ft) a reduction in output current andover voltage category is required.
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side.
Increase the 5mm to 15mm in case the adjacent device is a heat source. When the device is permanently loaded withless than 50%, the 5mm can be reduced to zero.
The device is designed, tested and approved for branch circuits up to 16A (IEC) and 15A (UL) without additional
protection device. If an external fuse is utilized, do not use circuit breakers smaller than 6A B- or 3A C-Characteristic
to avoid a nuisance tripping of the circuit breaker.
The maximum surrounding air temperature is +70°C (+158°F). The operational temperature is the same as theambient 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.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

3/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

3. AC-INPUT
AC input
Mains arrangement
AC input range

Input frequency
Turn-on voltage
Shut-down voltage
Input current
Power factor **)Turn-on overshootStart-up delay ***)
Rise time
*)
**)
***)

nom.

XT40.241
XT40.242
3AC 400V
3AC 480V
TN-, TT- or IT-Mains
3x 360-440Vac
3x 432-528Vac*)
3x 300-460Vac
3x 360-552Vac *)max.

3x 475Vac

3x 565Vac

nom.
typ.
typ.
nom.
typ.
typ.
typ.
typ.
typ.

50 – 60Hz
3x 325Vac
3x 295Vac
1.65A
0.93
480mV
400ms
40ms
70ms

50 – 60Hz
3x 390Vac
3x 355Vac
1.4A
0.93
480mV
350ms
40ms
70ms

consult factory if one phase is earthed
fully regulated output (±2%), Pout > 48W
permanently allowed,
see Fig. 5-1 for output voltage regulation
Absolute maximum input voltage with nodamage to the power supply. Output
might be off at this level.
±6%
see Fig. 5-2
see Fig. 5-2
at 40A, symmetrical input, see Fig. 5-4
at 40A, symmetrical input, see Fig. 5-5
see Fig. 5-3
over the entire load range, see Fig. 5-3
0mF, 40A, see Fig. 5-3
40mF, 40A, see Fig. 5-3

A minimum voltage of 3x340Vac (XT40.241) or 3x408Vac (XT40.242) is required to turn the power supply on.
The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.
The start-up delay for mains voltage interruptions up to 350ms is close to zero. In such cases, the power supply will
immediately generate the output voltage once the mains voltage interruption is over. Do not use the buffer moduleUF20.241 as an accessory when longer mains interruptions need to be bridged (see chapter 24).

Input Voltage Range

Fig. 5-1 Output voltage vs. input voltage and input current

Changes of the input voltage will be fully
regulated within certain limits. The
output voltage will only start to change
proportionally to the input voltage withextreme under or over-voltages. The
yellow LED reports an input voltage
problem if exceeded by a window of±15%. The maximum increase of theoutput voltage is limited to the 29.9V
OVP level. This level will be kept
regulated for 2s before the power supply
will shut down and reports “Shut-down”
by the red LED.

VOUT

POUT = 0W

28V
26V

POUT > 48W (5%)

24V
22V

VIN

20V

XT40.241: 300 320 340 360 380 400 420 440 460 480Vac
XT40.242: 360 384 408 432 456 480 504 528 552 576Vac

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

4/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

Fig. 5-2 Input voltage range

VIN

400V Version: 3x 360Vac
480V Version: 3x 432Vac

Start-updelay

3x 440Vac
3x 528Vac

Fig. 5-4 Input current vs. output load

1.2
0.9
0.6
0.3
0

Power Factor, typ.

1.0

)
0V
40
x
3
1(
V)
80
.24
4
0
x
4
3
2(
XT
.24
40
T
X

1.5

Rise
Time

Fig. 5-5 Power factor vs. output load

Input Current per Phase, typ.

1.8A

- 5%

OutputVoltage

Overshootfully regulated
range

Turn-onShut-down

POUT

Fig. 5-3 Turn-on behavior definitions

IntputVoltage

0.95
0.9
0.85
0.8

Output Current

0.75

Output Current

0.70

5 10 15 20 25 30 35 40 45 50A

5 10 15 20 25 30 35 40 45 50A

4. INPUT INRUSH CURRENT
There is virtually no input inrush current surge as there are no electrolytic bulk-capacitors utilized on the input side of
the power supply.
The charging current into the EMI suppression capacitors is disregarded for the first millisecond after switch-on.

Inrush current
Inrush energy
Inrush delay

max.
max.
typ.

XT40.241
4Apeak
5A2s
400ms

XT40.242
4Apeak
5A2s
350ms-25°C to +70°C, see Fig. 6-1-25°C to +70°C, see Fig. 6-1
see Fig. 6-1

Fig. 6-1 Input inrush current, typical behavior

A:

Inrush delay

XT40.241:
Input:
Output:Ambient:

3x400Vac, only one phase shown
24V, 40A
25°C

Upper curve:
Input current 2A / DIV
Medium curve: Input voltage 500V / DIV(measured between L and N)
Lower curve:
Output voltage 20V / DIVTime basis:
100ms / DIV

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

5/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

5. OUTPUT
Output voltage
Output voltage adjustment range
Output current

nom.

Short-circuit current

typ.

Output powernom.

Line regulation
Load regulation

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

Ripple and noise voltage *)Output capacitance

24.1V
none
40A
50A
180A

nom.

960W
1200W
±2%
800mV
200mV
1500mVpp
50mVpp
20 000µF

The output voltage is fixed. No adjustment possible
continuous, see Fig. 7-1
up to 15s with full output voltage, see Fig. 7-1
load impedance 25mOhm, see Fig. 7-1
Note: The short-circuit current is available for 0.1s
continuous
up to 15s
see Fig. 5-1
static value, 0A  40A  0A
static value, 5A  40A  5A
20Hz-2kHz, 50Ohm
2kHz to 20MHz, 50Ohm*) The ripple and noise voltage mostly consist of a mains ripple with 300Hz (50Hz mains) or 360Hz (60Hz mains). The ripple andnoise voltage can be reduced by the utilization of external capacitors.

The power supply is also designed to support loads with a higher short-term current and power requirement. The
short-term duration is firmware controlled by an output power manager. If the nominal output power is exceeded fora certain period of time which is defined in the zone A, B and C, the power supply responds with an automatic shutdown. Pressing the reset button or cycling the input power (10s off time is required) initiates an attempt to restart. If
the fault has been cleared the device will operate normally.
The short term power can be used periodically. See chapter 26.1 for further information.
Fig. 7-1 Output voltage vs. output current, typ.

A
15s

VOUT

C
0.1s

B
5s

24V

12V

0

20A

40A 50A 60A

80A

100A

120A

140A

XT40.241
3x 340V
3x 400V
3x 460V

XT40.242
3x 408V
3x 480V
3x 552V

160A

180A

200A

IOUT

Zone A: 25% extra output power for typ. 15s
Zone B: 100% higher output current for typ. 5s
Zone C: Quick-acting shut-down after typ. 0.1s

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

6/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

6. HOLD-UP TIME
Hold-up Time

Hold-up Time

typ.
typ.
typ.
typ.
min.
min.
min.
min.

XT40.241
2.0ms
1.8ms
4.0ms
3.6ms
1.6ms
1.45ms
3.2ms
2.9ms

The energy is stored in the output capacitor. As
soon as the input is turned off, the output
capacitor will be discharged and the voltage will
dissipate according to the curves in Fig. 8-2. The
lighter the load, the longer the hold-up time. Halfthe load means twice the hold-up time.
The hold-up time depends on the load
characteristic. The curves below show the hold-up
time for a load with a resistive and a constant
power characteristic.
The hold-up time is defined as the period of time
when the input is turned off and until the output
voltage falls below 24V –15% (20.4V). This value isdefined in the IEC61131-2 as the lower limit for the
supplying voltage.

XT40.242
2.0ms
1.8ms
4.0ms
3.6ms
1.6ms
1.45ms
3.2ms
2.9ms

40A, resistive load, see Fig. 8-2
40A, constant power load, see Fig. 8-2
20A, resistive load
20A, constant power load
40A, resistive load, see Fig. 8-2
40A, constant power load, see Fig. 8-2
20A, resistive load
20A, constant power load

Fig. 8-1 Hold-up time, definitions

Zero Transition
IntputVoltage

OutputVoltage

HoldupTime-15%

Fig. 8-2 Hold-up time vs. input voltage

VOUT
24V

40A, constant power load, min.

22V

40A, constant power load, typ.

20.4V

40A, resistive load, min.
40A, resistive load, typ.

18V
16V
14V

T

12V

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0ms

Note: At no load, the hold-up time can be up to one minute. The green DC-ok LED is on during this time.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

7/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

7. EFFICIENCY AND POWER LOSSES
Efficiency
Power losses

XT40.241
95.5%
45.2W
18.2W

typ.
typ.
typ.

XT40.242
95.5%
45.2W
18.2W

Fig. 9-1 Efficiency vs. output current

40A
40A
0A

Fig. 9-2 Losses vs. output current
Power Losses

Efficiency

50W

96%
95
94
93
92
91
90
89
88

40
30
20
10
Output Current

5

10

15

20

25

30

35

40A

Fig. 9-3 Efficiency vs. input voltage, 24V, 40A

95.8%

Efficiency

95.6

XT40.241

XT40.242

Output Current

0
0

52W

95.2

46

95.0

44

94.8

42

350

400

450

Power Losses

50
48

Input Voltage

XT40.241

XT40.242

Input Voltage

40

500 3x550Vac

8 12 16 20 24 28 32 36 40A

Fig. 9-4 Losses vs. input voltage, 24V, 40A

95.4

94.6

4

350

400

450

500 3x550Vac

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

8/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

8. FUNCTIONAL DIAGRAM
Fig. 10-1 Functional diagram

L1
L2
L3

Input
Filter
Input
Rectifier

Input
Voltage
MonitorActiveTransient
Blocker

Semiregulated
Power
Converter

OutputFilterTemp.
Shutdown

OverVoltage
Protection

OutputVoltage
Monitor

+
-

DC-ok
LED
Warning
LED

OutputPower
Manager

Shut-down
LED
Reset

9. FRONT SIDE AND USER ELEMENTS
Fig. 11-1 Front side of XT40.241

Output Terminals
Large screw terminal+ Positive output- Negative (return)outputSee chapter 12“Terminals andWiring” to choose
appropriate wire size.

Input Terminals
Screw terminals
L1, L2, L3:
Line inputs
PE (Protective
Earth) input

DC-ok LED (green)
Indicates a normal operation. The LED is on
if the output voltage is higher than 21.6V.
Warning LED (yellow)- A steady-state light indicates an output
current higher than the nominal current
and that the internal shutdown timer isrunning.
-

A double flash indicates a phase-loss or
too low / too high input voltage.
(XT40.241: < 3x333Vac or > 3x467Vac
XT40.242: < 3x400Vac or > 3x560Vac)-

A fast flash warns of an impending
temperature shut-down. A shut-down
can be expected within 10 minutes, if
the ambient temperature or the load
current stays constant.

Shut-down LED (red) and reset button
The red LED flashes when the device has
shut down. Pressing the reset button or
cycling the input power (10s required)initiates a restart. If the fault has beencleared the device will operate normally.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

10. TERMINALS AND WIRING
Use appropriate copper cables that are designed for a minimum operating temperatures of 60°C (for ambient up to45°C) and 75°C (for ambient up to 60°C). Follow national installation codes and regulations! Ensure that all strands ofa stranded wire enter the terminal connection! Do not use the power supply without PE (Ground) connection! Up totwo stranded wires with the same cross section are permitted in one connection point (except PE wire). Ferrules areallowed, but not required.
Input
Screw terminal
0.5-6mm2
0.5-4mm220-10 AWG
7mm / 0.26inch
0.8Nm / 7lb.inch

Type
Solid wire
Stranded wire
American wire gauge
Wire stripping length
Recommended tightening torqueOutputScrew terminal
0.5-16mm2
0.5-10mm222-8 AWG
12mm / 0.5inch
1.2Nm / 10.6lb.inch

11. RELIABILITY
Lifetime expectancy

MTBF SN 29500, IEC 61709
MTBF MIL HDBK 217F

min.
min.
min.

51 000ht.b.d.
142 000h
529 000h
959 000h
206 000h
276 000h

40°C, 24.1V, 40A
40°C, 24.1V, 20A
25°C, 24.1V, 40A
40°C, 24.1V, 40A
25°C, 24.1V, 40A
40°C, 24.1V, 40A, Ground Benign GB40
25°C, 24.1V, 40A, Ground Benign GB25

The Lifetime expectancy shown in the table above indicates the 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 prediction model allows a calculation of up to 15 years from date of shipment.
MTBF stands for Mean Time Between Failure, 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.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

12. EMCThe power supply is suitable for applications in industrial environments as well as in residential, commercial and lightindustry environments without any restrictions. The CE mark is in conformance with EMC guideline 89/336/EEC and93/68/EEC and the low-voltage directive (LVD) 73/23/EWG. A detailed EMC report is available on request.
EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)
Surge voltage on input
Surge voltage on output
Conducted disturbance
Mains voltage dips

Powerful transients

EN 61000-6-1 and EN 61000-6-2
Contact discharge
EN 61000-4-2
Air discharge
EN 61000-4-3
80MHz-1GHz
Input lines
EN 61000-4-4
Output lines
L1  L2, L2  L3, L1  L3
EN 61000-4-5
L1 / L2 / L3  PE
+EN 61000-4-5+ / -  PE
EN 61000-4-6
0.15-80MHz
0% of 400Vac
EN 61000-4-11
40% of 400Vac
70% of 100Vac
0% of 480Vac
40% of 480Vac
70% of 480Vac
VDE 0160
over entire load range

Generic standards
8kV
Criterion A
15kV
Criterion A
10V/m
Criterion A
4kV
Criterion A
2kV
Criterion A
2kV
Criterion A
4kV
Criterion A
500V
Criterion A
500V
Criterion A
10V
Criterion A
20ms
Criterion B
200ms
Criterion C
500ms
Criterion C
20ms
Criterion B
200ms
Criterion C
500ms
Criterion C
1300V, 1.3ms
Criterion D

Criteria:
A: Power supply shows normal operation behavior within the defined limits.
B: During the mains voltage dip, the output voltage will decrease according to curves in the section “Hold-up Time”. The unit works in normal mode
once the voltage dip is over. If criteria A is required, use one or two buffer modules UF20.241 in addition to the XT40 power supply.
C: Temporary loss of function is possible. Power supply might shut-down and restarts by itself. No damages or hazards for the power supply will occur.
D: The input transient blocker opens and the main converter is without input power during such transients. The output voltage decreases similar as
described in the hold-up time section during such an event.

EMC Emission
Conducted emission

EN 61000-6-3 and EN 61000-6-4
Generic standards
EN 55011, EN 55032, FCC Part 15, CISPR 11, CISPR 32 Class B, input lines
EN 55032
Class B, output lines
Radiated emission
EN 55011, EN 55032
Class B
Harmonic input current
EN 61000-3-2
Fulfilled, active PFC
Voltage fluctuations, flicker EN 61000-3-3
Fulfilled
This device complies with FCC Part 15 rules.
Operation is subjected to the 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
Switching frequency

36kHz

nearly constantNov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

13. ENVIRONMENT
Operational temperature
Output de-rating
Storage temperature
Humidity-25°C to +70°C (-13°F to 158°F)
24W/°C-40 to +85°C (-40°F to 185°F)
5 to 95% r.H.
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
2 hours / axis
0.5m2(s3)
2 hours / axis
15g 6ms, 10g 11ms
3 bumps / direction, 18 bumps in total
0 to 6000m (0 to 20 000ft)

Vibration sinusoidal
Vibration random
Shock
AltitudeOutput de-rating (for altitude)
Over-voltage category

60W/1000m or 5°C/1000m
III
II
2

Degree of pollution

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

reduce output power above +60°C
60-70°C (140°F to 158°F), see Fig. 15-1
storage and transportation
no condensation allowed
IEC 60068-2-6
IEC 60068-2-64
IEC 60068-2-27
Reduce output power or ambient
temperature above 2000m sea level.
above 2000m, see Fig. 15-2
EN 50178, altitudes up to 2000m
Altitudes from 2000m to 6000m
EN 50178, non conductive

Fig. 15-2 Output current vs. altitude

AllowedOutput Current

Allowed Output
Current

40A

40A

30

30

20

20

10

10

0
-25

Ambient Temperature

0

20

40

60 70°C

B

C

A

A... Tamb < 60°C
B... Tamb < 50°C
C... Tamb < 40°C

Altitude

0
0

2000

4000

6000m

The ambient temperature is defined 2cm below the unit.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

12/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

14. PROTECTION FEATURES
Output protection
Output over-voltage protection

Electronically protected against overload, no load and short circuits *)In case of an internal power supply failure, a redundantmax. 29.9Vdc
circuit limits the maximum output voltage. The output
shuts-down and automatically attempts to restart.
typ. 3x 470Vac
XT40.241
typ. 3x 560Vac
XT40.242
IP 20
EN/IEC 60529> 3.5mme.g. screws, small partsyes
output shut-down, reset required
MOV (Metal Oxide Varistor) and active transient blocker
not included
See section 26.4

Input overvoltage shut-down
Degree of protection
Penetration protection
Over-temperature protection
Input transient protection
Internal input fuse*) An audible noise may be heard during a no load, overload or short circuit event.

15. SAFETY
Input / output separation

SELV
IEC/EN 60950-1
PELV
EN 60204-1, EN 50178, IEC 60364-4-41
double or reinforced insulation
I
PE (Protective Earth) connection required> 5MOhm
input to output, 500Vdc< 0.1Ohm
between housing and PE terminal
typ. 0.30mA
XT40.241: 3x400V, 50Hz, TN mains< 0.35mA
XT40.241: 3x440V, 50Hz, TN mains
typ. 0.40mA
XT40.242: 3x480V, 60Hz, TN mains< 0.45mA
XT40.242: 3x524V, 60Hz, TN mains

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

16. DIELECTRIC STRENGTH
Type test

60s

A
2500Vac

B
3000Vac

C
500VacFactory test

5s

2500Vac

2500Vac

500VacField test

5s

2000Vac

2000Vac

500VacFig. 18-1 Dielectric strength

Input
L1
L2
L3

B

A
Earth

Output+C-

Type tests and factory tests:
Conducted by the manufacturer. Do not repeat these test in
the field!
Rules for field test:
Use appropriate test equipment which applies the voltage
with a slow ramp! Connect L1, L2 and L3 together as well as
all output poles.

The output voltage is floating and has no ohmic connection to ground. Grounding of output allowed.
To fulfill the PELV requirements according to EN60204-1 paragraph 6.4.1, PULS recommend that either the + pole orthe – 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 an unnoticed ground fault occurs.
Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

17. APPROVALS AND FULFILLED STANDARD
UL Certificate
Listed equipment for category NMTR - Industrial Control Equipment
Applicable for US and Canada
E-File: E198865
CB Scheme Certificate
General safety requirements for Information Technology Equipment(ITE)

UL 508

IEC 60950-1

UL Certificate
Recognized component for category QQGQ - Information Technology
Equipment (ITE)
Applicable for US and Canada
E-File: E137006
Manufacturer's Declaration (Online Document)
IEC 60068-2-60 - 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
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.
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

UL 60950-1

Corrosion
IEC 60068-2-60
Method 4

Corrosion
G3-ISA-71.04

VDMA 24364

18. REGULATORY COMPLIANCE
EU Declaration ofConformity

REACH Directive

EAC TR Registration

The CE mark indicates conformance with the- EMC directive- Low-voltage directive (LVD)- RoHS directive
Manufacturer's Statement
EU-Directive regarding the Registration, Evaluation,
Authorisation and Restriction of Chemicals
EAC Certificate
EAC EurAsian Conformity - Registration Russia, Kazakhstan andBelarus8504408200, 8504409000

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

19. PHYSICAL DIMENSIONS AND WEIGHT
WeightDIN-Rail

1400g / 3.09lb
Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN-rail height must be added to the depth (157mm) to calculate the total required
installation depth.
CAD files with mechanical data can be downloaded at www.pulspower.com
Fig. 22-1 Front viewFig. 22-2 Side view

20. INSTALLATION AND OPERATION INSTRUCTIONSMounting and installation:
Output terminal must be located on top and input terminal on the bottom. For other orientations see section 26.12.
An appropriate electrical and fire end-product enclosure needs to be considered in the end use application.
Cooling:
Convection cooled, no forced air cooling required. Do not block ventilation grill by more than 30%!
Installation clearances:
40mm on top, 20mm on the bottom, 5mm on the left and right side are recommended when loaded permanently
with full power. If the adjacent device is a heat source, 15mm clearance are recommended.
Risk of electrical shock, fire, personal injury or death!
Do not use the unit without proper earth connection (Protective Earth). Use the pin on the terminal block for earth
connection and not one of the screws on the housing.
Turn power off before working on the power supply. Protect against inadvertent re-powering.
Make sure the wiring is correct by following all local and national codes.
Do not open, modify or repair the unit.
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
Service parts:
The unit does not contain any field replaceable parts. If damage or malfunctioning should occur, immediately turnpower off and send the unit back to the factory for inspection!

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

15/21

XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

21. ACCESSORIES
Buffer module UF20.241
This buffer unit is a supplementary device for DC24V power supplies. It delivers power to bridge typical mains failures
or extends the hold-up time after turn-off of the AC power. In times when the power supply provides sufficient
voltages, the buffer unit stores energy in integrated electrolytic capacitors. In case of mains voltage fault, this energy
is released again in a regulated process.
Fig. 24-1 Buffer module UF 20.241

Fig. 24-2 Wiring diagram XT40 and UF20.241

The buffer unit does not require any
control wiring. It can be added in parallelto the load circuit at any given point.
Buffer units can be added in parallel toincrease the output ampacity or the holdup time.

Power
SupplyAC

BufferUnit(s)

Load

+
-

DC

Do not use the buffer module to bridge mains interruptions which are longer than typ. 350ms. Once the mains is off
for longer than typ. 350ms, the XT power supply needs an additional 1s to restart again.

22. COMPARISON BETWEEN THE XT40, A TRANSFORMER AND A TRADITIONALSWITCHED-MODE POWER SUPPLY

Input voltage range
Inrush current surge
Hold-up time
Phase-loss operation
Efficiency
Output voltage regulation
Output adjustment range
Ripple & noise voltage
Error diagnostics
Harmonic distortion (PFC)
EMC
Ease of installation
Size
Weight

XT40 Semiregulated power
supplyTraditionalswitched-mode
power supply

Transformer
power supply

+
++
+++
+
++
+
++
++
+++
+++

++
+
+
+
++
++
++
++
++
+
++
++
++
+

+
-

+++…very, very good++…very good+…good-…poor

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

23. APPLICATION NOTES
23.1. PERIODICAL PEAK POWER CAPABILITY
Fig. 26-Periodical peak power compatibility.

The short term power can be usedperiodically.
The duration of the peak power (TP)must be shorter than 15s.
The time between two peak power
pulses must be three times longer thanthe duration of the preceding pulse
length.

POUT
PNOM

T
TP

> 3x TP

125%
100%

t

23.2. CHARGING OF BATTERIESThe power supply shall not be used to charge batteries.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

23.3. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCB`s or UL 1077 supplementary breakers) can be used for branch protection
but ensure, that the MCB is rated for DC voltage too. The following tests show which circuit breakers the power
supply typically will trip.
Circuit breakers have huge tolerances in their tripping behavior. Therefore, these typical tests can only be used as arecommendation or for comparing two different power supplies. Furthermore, the loop impedance has a major
influence on whether a breaker trips or not. Two tests were performed, representing typical situations:
Test 1: Short circuit with S1 on the power supply end of the cable (loop impedance approx. 20mOhm)
Fig. 26-1 Branch protectors, test circuit 1

Power
SupplyAC

Parameters:

CircuitBreakerI

Input voltage:++

The following circuit breaker tripped during the test:
Load

S1

DC -

3x400Vac, load current: 0A

A- or Z- Characteristic::
B- Characteristic:
C- Characteristic:-equal or smaller 25A *)equal or smaller 32A *)equal or smaller 20A *)Test 2: Short circuit with S1 on the load end (additional impedance included; represents longer load wire length).
Parameters:

Fig. 26-2 Branch protectors, test circuit 2

CircuitBreakerI

Power
SupplyAC+

Input voltage:

The following circuit breaker tripped during the test:R

A- or Z- Characteristic::
B- Characteristic:
C- Characteristic:

+
Load

S1

DC -

3x400Vac, load current: 0A-≤ 25A and R= 50mOhm *)≤ 25A and R= 50mOhm *)≤ 20A and R= 82mOhm *)What does this resistance mean in wire length?
50mOhm1.0mm22.8m

1.5mm24.2m

2.5mm27.0m

4.0mm211.1m

6.0mm2
16.7m

10mm2
27.9m

82mOhm

4.6m

6.9m

11.4m

18.3m

27.4m

45.7m

*) A list of the circuit breakers under test is available on request.
Example:Which wire gauge must be used at a length of 10m before a B-Characteristic circuit breaker with 25A will trip?
Answer: A 25A B-Characteristic circuit breaker requires a loop impedance of less than 50mOhm based on the test
results. The wire length table shows that a length of 11.1m with a cross section of 4.0mm2 has an impedance of
50mOhm. A wire not smaller than 4.0mm2 shall be used.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

23.4. EXTERNAL INPUT PROTECTION
The power supply has no internal input fuses included. The unit is tested and approved for branch circuits up to 16A(U.S.A 15A). External protection is only required if the supplying branch has an ampacity greater than this. In somecountries local regulations might apply so check all local codes and requirements. If an external fuse is necessary or
utilized, minimum requirements need to be considered to avoid nuisance tripping of the fuse.
Ampacity

max.
min.

B-Characteristic
20A
6A

C-Characteristic
20A
3A

23.5. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show adverse effects when a load feeds back voltage to the power supply.
It does not matter, whether the power supply is on or off.
If the power supply is fully loaded after a return-feeding event, the output voltage can dip to 21V for approx 20ms.
The maximum allowed feed back voltage is 28.9Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 7.

23.6. PARALLEL USE TO INCREASE OUTPUT POWER
The XT40 Series of power supplies shall not be paralleled to increase the output power.

23.7. PARALLEL USE FOR REDUNDANCYPower supplies can be paralleled for a 1+1 redundancy to gain a higher system availability and reliability. Redundant
systems require a certain amount of extra power to support the load in case one power supply unit fails. The simplest
way is to put two X-Series power supplies in parallel which is called a 1+1 redundancy. In case one power supply unit
fails, the other one is automatically able to support the load current without any interruption.
Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit on
the secondary side of the power supply. In such a condition, the shorted unit becomes a load for the other power
supplies and the output voltage can not be maintained. This can be avoided by utilizing decoupling diodes which areincluded in the SilverLine redundancy module SLR01.
Recommendations for building redundant power systems:a) Use separate input fuses for each power supply.
b) Monitor the individual power supply units. A DC-ok LED and a DC-ok contact is included in the redundancy
module SLR01and can report a faulty unit.

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

23.8. SERIES OPERATION
The power supplies of the X-Series can be put in series to increase the output voltage.
Fig. 26-3 Schematic for series operation

Unit AAC
DC++

Unit B

AC
DC

+
-

-

Load

Earth
(see notes)

Installation notes for use in series:a) It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed
150Vdc.
b) Voltages with a potential above 60Vdc are no longer rated SELV
and can be hazardous in some situations. Such voltages must be
installed with a protection to make the unit touch-safe.
c)
For serial operation use power supplies of the same type.
d) Earthing of the output is required when the sum of the output
voltage is above 60Vdc.
e) Keep an installation clearance of 15mm (left/right) between two
power supplies and avoid installing the power supplies on top ofeach other.
Note: Avoid return voltage (e.g. from a decelerating motor orbattery) which is applied to the output terminals.

23.9. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any kind of loads, including inductive loads or capacitive loads with a capacity of up
to160mF.

23.10. LOSS OF ONE INPUT PHASEThe unit protects itself against a loss of one input phase and does not require an external protection device.
A phase-loss operation is possible for output currents below 8A. Above this level, the yellow LED indicates animpending shut-down. If the missing phase does not recover, the unit switches off after 3.5s. Pressing the reset
button or cycling the input power (10s required) initiates a restart.
Please note that the input current and the output ripple are higher during the time when one phase is missing.

23.11. USE IN A TIGHTLY SEALED ENCLOSURE
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than outside. The inside temperature defines the ambient temperature for the power supply.
Results from such an installation:
Power supply is placed in the middle of the box, no other heat producing equipment inside the box
Enclosure:
Load:
Input:
Temperature inside the box:
Temperature outside the box:
Temperature rise:

Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm
24V, 32A (=80% of the rated current); load is placed outside the box
3x400Vac
54.9°C (in the middle of the right side of the power supply with a distance of 2cm)
25.7°C
29.7K

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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XT40.241, XT40.242
24V, 40A, THREE-PHASE INPUT– X-Series

23.12. 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 max. allowed ambient temperature. The amount of reduction defines
the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous operation canbe found below:
Curve A1
Curve A2

Recommended output current to achieve a minimum lifetime expectancy of 50 000h at 40°C ambient.
Max allowed output current for a safe operation (results approx. in half the lifetime expectancy of A1).

Fig. 26-4
Mounting
Orientation A
Standard
Orientation

Output Current

40A

OUTPUT

A1

30
Power
Supply20
10
Ambient Temperature

0

INPUT

10
Fig. 26-5
Mounting
Orientation B(Upside down)

20

30

40

60°C

50

Output Current

40A

INPUT

30

A2

Power
Supply20

A1

OUTPUT

0

10
Ambient Temperature

10
Fig. 26-6
Mounting
Orientation C(Table-top
mounting)

20

30

50

40

60°C

Output Current

40A
30

A2
A1

20
10

Ambient Temperature

0
10

50

40

60°C

40A
OUTPUT

Power
Supply

30

A2

20

A1

10
Ambient Temperature

0
10

20

30

40

50

60°C

Output Current

30
INPUT

Power
Supply40A
OUTPUT

Fig. 26-8
Mounting
Orientation E(Horizontal ccw)

30

Output Current

INPUT

Fig. 26-7
Mounting
Orientation D(Horizontal cw)

20

A2
A1

20
10

Ambient Temperature

0
10

20

30

40

50

60°C

Nov. 2020 / Rev. 1.1 DS-XT40.24x-EN All parameters are specified at 24V 40A, 3x400Vac (XT40.241) or 3x480Vac (XT40.242),
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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