ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

POWER SUPPLY
■
■
■
■
■
■
■
■
■
■

AC 100-240V Wide Range Input
NEC Class 2 Compliant
Adjustable Output Voltage
Efficiency up to 89%
Compact Design, Width only 45mm
Full Output Power Between -10°C and +60°C
DC-OK Signal Included
Large International Approval Package
DIN-Rail Bracket for Wall or Panel Mount Included
3 Year Warranty

1. GENERAL DESCRIPTION

2. SHORT-FORM DATA

A compact size, light weight, simple mounting on
the DIN-rail and the quick connect spring-clamp
terminals are what makes the MiniLine power
supplies so easy to use and installs in seconds.

Output voltage
Adjustment range
Output current

DC 24V
24-28V
2.1–1.8A

A rugged electrical and mechanical design as well asa high immunity against electrical disturbances on
the mains provides reliable output power. This offers
superior protection for equipment which isconnected to the public mains network or is exposed
to a critical industrial environment.

Output power

50W

Output ripple
Input voltage
Mains frequency
AC Input current
Power factor
AC Inrush current< 50mVpp
AC 100-240V
50-60Hztyp. 0.77 / 0.44A
typ. 0.56 / 0.52
17 / 35A

DC Input
Efficiency
LossesTemperature range
Derating
Hold-up time
Dimensions

85-375Vdc
typ. 88.4 / 89.0%
typ. 6.6 / 6.2W
-10°C to +70°C
1.3W/°Ctyp. 35 / 190ms
45x75x91mm

The MiniLine series offers output voltages from 5 to
56Vdc and a power rating of up to 100W. A DC-OK
signal allows remote diagnostics.
The supplementary MiniLine decoupling diodemodule MLY02.100 allows building of redundant
systems or to protect against back-feed voltages.
Screw
terminals

24V MiniLine
Related products
ML30.100

Less
ML50.100power

For other output voltages or
output power see catalog

ML50.111

Conformal
ML50.109
coating
Parallel use
ML50.101
optionMore
ML100.100
power
380-480V
ML100.200
input

3. ORDER NUMBERS
Power Supply
Accessory

ML50.100
ML50.109
MLY02.100

24-28V

20Hz to 20MHz
Wide Range Input±6%
at 120 / 230Vac
at 120 / 230Vac
typ. peak value
at 120 / 230Vac
40°C and cold startat 120 / 230Vac
at 120 / 230Vac
operational+60 to +70°C
at 120 / 230Vac
WxHxD

4. MARKINGS

Standard unit
Conformal coated unit
Decoupling /Redundancy module

IND. CONT. EQ.

UL 60950-1

UL 508NEC Class 2&
Medicalapproval

GL
MarineMar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Class I Div 2

Germany

EMC, LVD

1/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

INDEX

PAGE

1. General Description ............................................1
2. Short-form Data ..................................................1
3. Order Numbers....................................................1
4. Markings ..............................................................1
5. AC-Input...............................................................3
6. Input Inrush Current Surge .................................4
7. DC-Input...............................................................4
8. Hold-up Time.......................................................5
9. DC-OK Output .....................................................5
10. Output .................................................................6
11. Efficiency and Power Losses................................7
12. Functional Diagram.............................................8
13. Reliability .............................................................8
14. Front Side and User Elements.............................915. Terminals and Wiring..........................................9
16. EMC....................................................................10
17. Environment ......................................................11
18. Protection Features ...........................................11
19. Safety .................................................................12
20. Dielectric Strength ............................................12

INDEX

PAGE

21. Approvals.......................................................... 13
22. Fulfilled Standards............................................ 13
23. Used Substances ............................................... 13
24. Physical Dimensions and Weight ..................... 14
25. Installation and Operation Instructions .......... 14
26. Accessory........................................................... 15
27. Application Notes............................................. 16
27.1. Peak Current Capability ......................... 16
27.2. Back-feeding Loads ................................ 16
27.3. Series Operation..................................... 1727.4. Parallel Use to Increase Output Power . 17
27.5. Parallel Use for Redundancy.................. 17
27.6. Daisy Chaining of Outputs..................... 18
27.7. Charging of Batteries ............................. 18
27.8. External Input Protection....................... 19
27.9. Inductive and Capacitive Loads ............. 1927.10. Operation on Two Phases ...................... 19
27.11. Use in a Tightly Sealed Enclosure .......... 19
27.12. Mounting Orientations .......................... 20

INTENDED USE
The power supply shall only be installed and put into operation by qualified personnel.
This power supply is designed for installation in an enclosure and is intended for the general use, such as in industrial
control, office, communication, and instrumentation equipment. Do not use this device in aircraft, trains and nuclear
equipment, where malfunctioning of the power supply may cause severe personal injury or threaten human life.

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

Earth, Ground

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

T.b.d.

To be defined, value or description will follow later.

AC 230V

A figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances (usually ±15%) included.
E.g.: DC 12V describes a 12V battery regardless whether it is charged (13.7V) or discharged(10V). As long as not otherwise stated, AC 100V and AC 230V parameters are valid at 50Hz
and AC 120V parameters are valid at 60Hz mains frequency.

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

DISCLAIMER
The information presented in this document is believed to be accurate and reliable and may change without notice.
The housing is patent by PULS (US patent No US D442,923S)
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

2/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

5. AC-INPUT
AC input
AC input range

nom.

Input frequency
Turn-on voltage
Shut-down voltage

nom.
typ.
typ.

AC 100-240V
85-264Vac
60-85Vac
264-300Vac
50 – 60Hz
65Vac
55Vac

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

AC 100V
0.91A
0.58
3.05
32ms
33ms
45ms
400mV

Input current
Power factor *)Crest factor **)Start-up delay
Rise timeTurn-on overshootWide-range input, TN-, TT-, IT-Mains, see Fig. 5-1
Continuous operation
Full power for 200ms, no damage between 0 and 85Vac< 0.5s±6%
Steady-state value, see Fig. 5-1
Steady-state value, see Fig. 5-1
AC 120V
0.77A
0.56
3.26
32ms
33ms
45ms
400mV

AC 230V
0.47A
0.52
3.91
32ms
48ms
60ms
400mV

at 24V, 2.1A see Fig. 5-3
at 24V, 2.1A see Fig. 5-1
at 24V, 2.1A
See Fig. 5-2
0mF, 24V, 2.1A, see Fig. 5-2
2mF, 24V, 2.1A, see Fig. 5-2
See Fig. 5-2*)
The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.
**) The crest factor is the mathematical ratio of the peak value to RMS value of the input current waveform.
Fig. 5-1 Input voltage range

Turn-onShut-down

full
power
for
200ms

IntputVoltage

max.
500ms

VIN
60V 85V

Start-up
delay

Fig. 5-3 Input current vs. output load

0.8

Rise
Time

264V 300Vac
Fig. 5-4 Power Factor vs. output load
Power Factor, typ.

Input Current, typ.

1.0A

- 5%

OutputVoltage

Overshoot

Rated
input range

POUT

Fig. 5-2 Turn-on behavior, definitionsaba) 100Vacb) 120Vacc) 230Vac

0.6

c

0.4

0.65
0.6

a) 100Vacb) 120Vacc) 230Vac

a
b

0.55

c

0.5

0.2

0.45
Output Current

0
0.1

0.5

0.9

1.3

1.7

2.1A

0.4
0.1

Output Current

0.5

0.9

1.3

1.7

2.1A

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

3/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

6. INPUT INRUSH CURRENT SURGEA NTC limits the input inrush current after turn-on of the input voltage. The inrush current is input voltage andambient temperature dependent.
max.
typ.
typ.

Inrush current
Inrush energy

AC 100V
18Apeak
14Apeak
0.3A2sFig. 6-1 Input inrush current, typical behavior

AC 120V
23Apeak
17Apeak
0.4A2s

AC 230V
48Apeak
35Apeak
1.5A2s

40°C ambient, cold start
40°C ambient, cold start
40°C ambient, cold startFig. 6-2 Input inrush current, zoom into the first peak

Input Current

Input Voltage

Output Voltage
Input Current

Input:
Output:Ambient:
Upper curve:
Middle curve:
Lower curve:Time scale:

230Vac
24V, 2.1A
40°C
Input current 20A / DIVInput voltage 1000V / DIV
Output voltage 20V / DIV
20ms / DIVInput:
230VacOutput:
24V, 2.1A
Ambient:
40°C
Input current curve: 10A / DIV, 1ms / DIV
Ipeak
32.4A
The charging current into EMI suppression capacitors isdisregarded in the first microseconds after switch-on.

7. DC-INPUT
DC input
DC input range
DC input current
Turn-on voltage
Shut-down voltage

nom.
min.
typ.
typ.
typ.

DC 110-290V -25%/+30%
85-375Vdc
Continuous operation
0.50A / 0.19A
110Vdc / 300Vdc at 24V and 2.1A
81Vdc
Steady state value
58Vdc
Steady state value

Fig. 7-1 Wiring for DC Input

Battery+AC
L

internal
fused

+

Fuse

a)

Use a battery or similar DC source.

b)Connect +pole to L and – pole to N.

c)Connect the PE terminal to a earth wire orto the machine ground.

d)

In case the – pole of the battery is notconnected to earth, use an appropriate fuse
to protect the N terminal.

Load

N

-

Instructions for DC use:

Power Supply

-

PE
DC

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

4/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

8. HOLD-UP TIME
Hold-up Time

typ.
typ.

AC 100V
54ms
26ms

AC 120V
82ms
40ms

Fig. 8-1 Hold-up time vs. input voltage

AC 230V
360ms
180ms

1.05A, 24V, see Fig. 8-1
2.1A, 24V, see Fig. 8-1

Fig. 8-2 Shut-down behavior, definitions

Hold-up Time
a

120ms

b

c

Zero Transitiond

IntputVoltage

10080a) 24V 1.05A typ.
b) 24V 1.05Amin.
c) 24V 2.1A typ.
d) 24V 2.1A min.

60
40

- 5%

OutputVoltage20

Hold-up Time

Input Voltage

0
85

120

155

190

230VacNote: At no load, the hold-up time can be up to several seconds. The green DC-ok lamp is also on during this time.

9. DC-OK OUTPUT
This feature monitors the output voltage, which is present on the output terminals.
The signal is a source output which can feed loads up to 30mA. Loads can be a 24V relay (Rcoil < 700Ohm), a LED or
the input of a PLC system. The relays operates or the LED is on if output voltage exceeds the threshold level. A freewheeling diode (necessary when the load is a relay) is already included in the power supply.
Threshold value
Output current
Output voltage

20V +/-4%
30mA
Vout – 1V
at 30mAmin.
min

For typical values see Fig. 9-2
The open collector is internally linked to the positive output pole. The
DC-OK voltage is approximately the output voltage if the output voltage
is higher than the threshold level.
Fig. 9-2 Output characteristic DC-OK signal

Fig. 9-1 DC-ok wiring diagram

DC-OK Voltage

Test Setup
ML50

Relay

+ + - - DC
ok
DC-ok

24-28V

+

28V

+

24
20

-

16

LED

12

MiniLine
DC
OK

V

Load

8

A

4
0

N L

DC-OK Current

0

5

10

15

20

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

25

30

35 40mA

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

10. OUTPUT
Output voltage
Adjustment range
Factory settingLine regulation
Load regulation
Ripple and noise voltage
Output capacitance
Output current
Output power
Short-circuit current

nom.
min.
max.

24V
24-28V
30V

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

24.5V
10mV
100mV
50mVpp1600µF
2.1A
1.8A
50W
3.1A
5A

Guaranteed
At clockwise end position of potentiometer±0.2%, at full load, cold unit
85 to 264Vac
Static value, 0A Æ 2.1A Æ 0A
20Hz to 20MHz, 50Ohm
At 24V, see Fig. 10-1
At 28V, see Fig. 10-1
Load impedance 400mOhm, see Fig. 10-1
Load impedance 400mOhm, see Fig. 10-1

Fig. 10-1 Output voltage vs. output current,
230Vac, typ.
Output Voltage

Adjustment
Range

28V
24
20
16
12
8
4
0

Output Current

0

0.5

1

1.5

2

2.5

3

3.5

4A

Peak current capability (up to several ms)
The power supply can deliver a peak current which is higher than the specified short term current. This helps to start
current demanding loads or to safely operate subsequent circuit breakers.
The extra current is supplied by the output capacitors inside the power supply. During this event, the capacitors will
be discharged and cause a voltage dip on the output. Detailed curves can be found in chapter 27.1.
Peak current voltage dips

typ.
typ.
typ.

from 24V to 16Vfrom 24V to 15Vfrom 24V to 10.5V

at 4.2A for 50ms, resistive load
at 10.5A for 2ms, resistive load
at 10.5A for 5ms, resistive load

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

6/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

11. EFFICIENCY AND POWER LOSSES
Efficiency
Power losses

typ.
typ.
typ.
typ.

AC 100V
87.5%
0.6W
4.0W
7.2W

Fig. 11-1 Efficiency vs. output current at 24V
Efficiency

90%
88
86
84
82
80
78
76
74
0.3

AC 120V
88.4%
0.7W
4.1W
6.6W

AC 230V
89.0%
1.3W
4.4W
6.2W

2.1A, 24V
0A
1.05A, 24V
2.1A, 24V

Fig. 11-2 Losses vs. output current at 24VPower Lossesbaca) 100Vacb) 120Vacc) 230Vac

Output Current

0.6

0.9

1.2

1.5

8W
7
6
5
4
3
2
1
0

a) 100Vacb) 120Vacc) 230Vac

a b
c

c
b
a
Output Current

0

1.8 2.1A

0.3

0.6

0.9

1.2

1.5

1.8 2.1A

Fig. 11-3 Efficiency vs. input voltage, 24V, 2.1A

Fig. 11-4 Losses vs. input voltage, 24V, 2.1A

Efficiency

Power Losses

91%

9W

90

8

89
88

7

87

6

86
Input Voltage

85
85

120

155

190

Input Voltage

5
225 260Vac

85

120

155

190

225 260Vac

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

7/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

12. FUNCTIONAL DIAGRAM
Fig. 12-1 Functional diagram
DC
ok

L
N

Input Fuse&
Input Filter

Input
Rectifier&InrushLimiterPower
Converter

Output OverVoltage
Protection

OutputFilter

+
+
-

DC-OK
Transistor
SignalDC-ok
SignalOutputVoltage
Regulator

VOUT

13. RELIABILITY
These units are extremely reliable and use only the highest quality materials. The number of critical components suchas electrolytic capacitors has been reduced.

Lifetime expectancy

MTBF SN 29500, IEC 61709
MTBF MIL HDBK 217F

min.
min.
min.

AC 100VAC 120V

AC 230V

34 000h
112 000h
96 000h
2 383 000h
3 977 000h
1 021 000h
1 370 000h

44 000h
117 000h
125 000h
2 456 000h
4 100 000h
1 053 000h
1 413 000h

54 000h
111 000h
152 000h
2 613 000h
4 362 000h
1 120 000h
1 503 000h

40°C, 24V, 2.1A
40°C, 24V, 1.05A
25°C, 24V, 2.1A
40°C, 24V, 2.1A
25°C, 24V, 2.1A
40°C, 24V, 2.1A, Ground Benign GB40
25°C, 24V, 2.1A, Ground Benign GB25

The Lifetime expectancy shown in the table 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. Lifetime expectancy 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.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

8/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

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

DC-OK LED (green)
On when the voltage at theoutput terminals is > 20 V

Output & Signal Terminals
Spring-clamp terminals
Dual terminals per pole

DC-OK LED and DC-OK signal
functions are synchronized+-

Positive output
Negative (return) output
Dual pins per pole
DC-OK Open collector output
Indicates an output
voltage higher than
20Vdc

Output Voltage
Potentiometer
Turn to set the output voltage.
Factory set: 24.5V
Input Terminals
Spring-clamp terminals
N … Neutral input
L … Line (hot) input... PE (Protective Earth) input

15. TERMINALS AND WIRING
All terminals are easy to access when mounted on the panel. Input and output terminals are separated from eachother (input below, output above) to help in error-free wiring. Mounting and wiring do not require any screwdriver.
Type
Solid wire
Stranded wire
American wire gauge
FerrulesWire stripping length
Pull-out force

Quick-connect spring-clamp terminals
0.3-4mm2
0.3-2.5mm2
26-12 AWG
Allowed, but not required
6mm / 0.25inch
12AWG:60N, 14AWG:50N, 16AWG:40N(according to UL486E)

Fig. 15-1 Connecting a wire

Instructions:a)

Use appropriate copper cablesb)

Follow local and national installation codes andregulations!

c)Ensure that all strands of a stranded wire enter
the terminal connection!

d)

Do not use the unit without PE connection.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

16. EMCThe CE mark indicates conformance with EMC guideline 89/336/EEC, 93/68/EEC and the low-voltage directive (LVD)
73/23/EWG. A detailed EMC Report is available on request.
EMC Immunity
Electrostatic discharge

EN 61000-6-2, EN 61000-6-1
EN 61000-4-2

Electromagnetic RF field
Fast transients (Burst)

EN 61000-4-3
EN 61000-4-4

Surge voltage on input

EN 61000-4-5

Surge voltage on output

EN 61000-4-5

Conducted disturbance
Mains voltage dips

EN 61000-4-6
EN 61000-4-11

Voltage interruptions
Input voltage swells
Powerful transients

EN 61000-4-11
PULS internal standard
VDE 0160

Contact discharge
Air discharge
80MHz-1GHz
Input lines
Output linesLÆN
N / L Æ PE
+Æ+ / - Æ PE
0,15-80MHz
0% of 100Vac
40% of 100Vac
70% of 100Vac
0% of 200Vac
40% of 200Vac
70% of 200Vac

over entire load
range

Generic standards
8kV
Criterion A
8kV
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
0Vac, 20ms
Criterion A
40Vac, 200ms
Criterion C
70Vac, 500ms
Criterion A
0Vac, 20ms
Criterion A
80Vac, 200ms
Criterion A
140Vac, 500ms
Criterion A
0Vac, 5000ms
Criterion C
300Vac, 500ms
Criterion A
750V, 1.3ms

Criterion A

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

EN 61000-6-3, EN 61000-6-4
Generic standards
EN 55011, EN 55022, FCC Part 15, CISPR 11, CISPR 22 Class B, input lines
EN 55022
Class B, output lines
Radiated emission
EN 55011, EN 55022
Class B
Harmonic input current
EN 61000-3-2
Fulfilled
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.
EMC Emission
Conducted emission

Switching frequency

variable, typ. 100kHz, (60-275kHz)

Input voltage and output load dependentMar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

10/20

ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

17. ENVIRONMENT
Operational temperature
Output de-rating
Storage temperature
Humidity-10°C to +70°C (14°F to 158°F)
1.3W/°C-40 to +85°C (-40°F to 185°F)
5 to 95% r.H.

Reduce output power according to Fig. 17-1
60-70°C (140°F to 158°F), see Fig. 17-1
Storage and transportation
IEC 60068-2-30

Vibration sinusoidal

2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
2 hours / axis
20g 6ms, 10g 11ms
3 bumps / direction, 18 bumps in total
0 to 6000m (0 to 20000ft)

IEC 60068-2-6

Do not energize while condensation is present

Shock
AltitudeOutput de-rating (for altitude)
Over-voltage category
Degree of pollution

3W/1000m or 5°C/1000m
III
II
2

Fig. 17-1 Output current vs. ambient temp.

IEC 60068-2-27
Reduce output power or ambient
temperature above 2000m sea level.
Above 2000m (6500ft), see Fig. 17-2
EN 50178, IEC 62103 altitudes < 2000m
Altitudes from 2000m to 6000m
EN 50178, IEC 62103, non conductive

Fig. 17-2 Output current vs. altitude, 24V

Allowable Output
Current at 24V

Allowable Output
Current at 24V

2.4A

2.4A

2.0

2.0

1.6

1.6

1.2

1.2

0.8

0.8

0.4

0.4
Ambient Temperature

0
-10

0

20

40

A

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

0

2000

C

Altitude0

60 70°C

B

4000

6000m

The ambient temperature is defined 2cm below the unit.

18. PROTECTION FEATURES
Output protection
Output over-voltage protection

Output over-current protection
Degree of protection
Penetration protection
Over-temperature protection
Input transient protection
Internal input fuse

Electronically protected against overload, no-load and short-circuits
typ. 36V
In case of an internal power supply fault, a redundantmax. 39V
circuit limits the maximum output voltage. The output
shuts down and automatically attempts to restart.
electronically limited
see Fig. 10-1
IP 20
EN/IEC 60529> 2.5mm in diameter
E.g. screws, small parts
not included
MOV
Metal Oxide Varistor
T3.15A H.B.C.
Not user replaceable

Note: In case of a over-voltage, overload, no-load or short-circuit event, an audible noise may be heard.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 2.1A, SINGLE PHASE INPUT

MiniLine

19. SAFETY
Input / output separation

SELV
IEC/EN 60950-1
PELV
EN 60204-1, EN 50178, IEC 62103, IEC 60364-4-41
double or reinforced insulation
I
PE (Protective Earth) connection required> 5MOhm
input to output, 500Vdc
typ. 0.12mA
100Vac, 50Hz, TN mains
typ. 0.17mA
120Vac, 60Hz, TN mains
typ. 0.29mA
230Vac, 50Hz, TN mains< 0.16mA
110Vac, 50Hz, TN mains< 0.23mA
132Vac, 60Hz, TN mains< 0.40mA
264Vac, 50Hz, TN mains

Class of protection
Isolation resistance
Touch current (leakage current)

20. DIELECTRIC STRENGTH
Fig. 20-1 Dielectric strength

Input
L
N

B

+

A
Earth, PE

OutputC

DCOk

Type test

60s

A
2500Vac

B
3000Vac

C
500VacFactory test

5s

2500Vac

2500Vac

500VacField test
5s
2000Vac
2000Vac
500VacType tests and factory tests:
Conducted by the manufacturer. Do not repeat test in field!
Rules for field test:
Use appropriate test equipment which applies the voltage
with a slow ramp! Connect L and N together as well as all
output poles.

The output voltage is floating and has no ohmic connection to ground.
To fulfill the PELV requirements according to EN60204-1 § 6.4.1, it is recommended that either the + pole, the – poleor any other part of the output circuit should be connected to the protective earth system. This helps to avoid
situations in which a load starts unexpectedly or can not be switched off when an unnoticed earth faults occur.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

21. APPROVALS
IEC 60950-1

IECEE

CB Scheme,
Information Technology Equipment

CB SCHEME
IEC 60601-1

IECEE

CB Scheme,
Medical, Basic Insulation

CB SCHEMEUL 508LISTED as Industrial Control Equipment E198865
IND. CONT. EQ.

UL2601

LISTED as Medical

UL 60950-1

RECOGNIZED E137006 recognized for the use in U.S.A. (UL 60950-1) and Canada(C22.2 No. 60950). Information Technology Equipment, Level 3

NEC Class 2

Listed as Limited Power Source (LPS) in the UL 60950-1 UL report.

UL 1604

RECOGNIZED E246877 recognized for use in U.S.A. (UL 1604) and Canada (C22.2
No. 213-M1987) Hazardous Location Class I Div 2 T4 Groups A,B,C,D andClass I Zone 2 Groups IIA, IIB and IIC
The unit is suitable for use in Class I Division 2 Groups A, B, C, D locations as well as for Class I Zone 2Groups IIA, IIB and IIC locations. Substitution of components may impair suitability for Class I Division 2
environment. Do not disconnect equipment unless power has been switched off. Wiring must be inaccordance with Class I, Division 2 wiring methods of the National Electrical Code, NFPA 70, and inaccordance with other local or national codes.

MarineGLABS

GL (Germanischer Lloyd) classified and ABS (American Bureau for Shipping) PDA
for marine and offshore applications. Environmental category: C, EMC2SEMI F47

SEMI F47-0200 Power Quality Star
Ride-through compliance for semiconductor industry.
Full SEMI range compliance (Input: 120Vac or 208Vac)

22. FULFILLED STANDARDSEN 61558-2-17

Safety of Power Transformers

EN/IEC 60204-1

Safety of Electrical Equipment of Machines

EN/IEC 61131-2

Programmable Controllers

EN 50178, IEC 62103

Electronic Equipment in Power Installations

23. USED SUBSTANCESElectrolytic capacitors included in this unit do not use electrolytes such as Quaternary Ammonium Salt Systems.
Plastic housings and other molded plastic materials are free of halogens, wires and cables are not PVC insulated.
The unit conforms to the RoHS directive 2002/96/EC
The materials used in our production process do not include the following toxic chemicals:
Polychlorinated Biphenyl (PCB), Pentachlorophenol (PCP), Polychlorinated naphthalene (PCN), PolybrominatedBiphenyl (PBB), Polybrominated Biphenyl Oxide (PBO), Polybrominated Diphenyl Ether (PBDE), PolychlorinatedDiphenyl Ether (PCDE), Polybrominated Diphenyl Oxide (PBDO), Cadmium, Asbestos, Mercury, Silica

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

24. PHYSICAL DIMENSIONS AND WEIGHT
WeightDIN-Rail

240g / 0.53lb
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 (91mm) to calculate the total required
installation depth.
Electronic files with mechanical data can be downloaded at www.pulspower.com

Fig. 24-1 Front viewFig. 24-2 Side view

25. INSTALLATION AND OPERATION INSTRUCTIONSMounting:
Output terminal must be located on top and input terminal on the bottom. For other orientations see chapter 27.12.
An appropriate electrical and fire end-product enclosure should be considered in the end use application.
Cooling:
Convection cooled, no forced cooling required. Do not cover ventilation grill (e.g. cable conduits) by more than 30%!
Installation clearances:
25mm on top and bottom.
Risk of electrical shock, fire, personal injury or death!
Do not use the unit without proper earth connection (Protective Earth).
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 service parts. The tripping of an internal fuse is caused by an internal fault. If damage
or malfunctioning should occur during operation, immediately turn power off and send unit to the factory for
inspection!

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

26. ACCESSORYDIN-Rail bracket for wall or panel mountA DIN-rail bracket is included in each shipping box.
Fig. 26-1 DIN-Rail Bracket

Fig. 26-2 DIN-Rail Bracket Dimensions

Hole diameter: 4.2mm

MLY02.100 Dual decoupling module 2x5A
Fig. 26-4 Redundant System with Two ML50.100
and One MLY02.100
PS2 ok+ + - - DCok

+ + - - DC
ok

adj.

adj.

ML50.100

ML50.100

L

N

L

N

+ -

VIN 1

+ -

VIN 2

MLY02

Load

VOUT

++ --

+

PS1 ok-I

Fig. 26-3 MLY02.100 Dual Decoupling Module

I
L
N

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

27. APPLICATION NOTES
27.1. PEAK CURRENT CAPABILITY
Solenoids, contactors and pneumatic modules often have a steady state (sealed) 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 thenominal output current. The same situation applies, when starting a capacitive load.
Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch
circuit, the protective device (fuse, circuit breaker) needs a certain amount of over-current to trip or to blow. The
peak current capability ensures the safe operation of subsequent circuit breakers.
Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside thepower supply can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:
Fig. 27-1 Peak load 4.2A for 50ms, typ.

OutputVoltage

24.0V

Fig. 27-2 Peak load 10.5A for 5ms, typ.

24.0V
t
t pu
Ou ltage
o
V

16V
10.5A

4.2A
OutputCurrent

0A

10.5V
OutputCurrent

0A
1ms/DIV

10ms/DIVPeak load 4.2A (resistive) for 50ms
Output voltage dips from 24V to 16V.

Peak load 10.5A (resistive) for 5ms
Output voltage dips from 24V to 10.5V.

27.2. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power
supply. It does not matter, whether the power supply is on or off.
The maximum allowed feed back voltage is 35Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 10.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

27.3. SERIES OPERATION
The power supply can be put in series to increase the output voltage.
Fig. 27-3 Schematic for series operation
Unit AAC
DC++

Unit B

AC
DC

Load

+
-

Earth

Instructions 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 not SELV any
more and can be dangerous. Such voltages must be installedwith a protection against touching.
c)
For serial operation use power supplies of the same type.
d) Earthing of the output is required when the sum of theoutput voltage is above 60Vdc.
Note: Avoid return voltage (e.g. from a decelerating motor orbattery) which is applied to the output terminals.

27.4. PARALLEL USE TO INCREASE OUTPUT POWER
Several power supplies can be paralleled to increase the output power. The ML50.100 has no feature included whichbalances the load current between the power supplies. Usually the power supply with the higher adjusted output
voltage draws current until it goes into current limitation. This means no harm to this power supply as long as theambient temperature stays below 50°C. If a current sharing feature is required, choose the ML50.101 or ML50.111.

Fig. 27-4 Schematic for parallel operation
Unit AAC
DC++

Unit B

AC
DC

Load

+
-

-

Instructions for parallel use:a) Use only power supplies from the same series (ML-Series).
b) Adjust the output voltages of all power supplies toapproximately the same value (±200mV).
c)
A fuse (or diode) on the output is only required if more than
three units are connected in parallel.
d) Do not load terminals with more than 13A. Follow wiring
instructions according to chapter 27.6e) Ensure that the ambient temperature of the power supply
does not exceed 50°C.

27.5. PARALLEL USE FOR REDUNDANCYPower supplies can be paralleled for redundancy to gain a higher system reliability. Redundant systems require acertain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two
MiniLine power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one
is automatically able to support the load current without any interruption. Redundant systems for a higher power
demand are usually built in a N+1 method. E.g. Five power supplies, each rated for 2.1A are paralleled to build a 8A
redundant system. If one unit fails, the 8A can still be drawn.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

Please note: This simple way to build a redundant system has two major disadvantages:-

The faulty power supply can not be recognized. The green LED will still be on since it is reverse-powered fromthe other power supply.

-

It does not cover failures such as an internal short circuit in the secondary side of the power supply. In such asituation the defective unit becomes a load for the other power supplies and the output voltage can not be
maintained any more.

This above conditions can be avoided by utilizing decoupling diodes which are included in the decoupling module
MLY02.100.
Other 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 output is included in the ML50.100, ML50.101 andML50.111. In all other cases, use the redundancy module YRM2.DIODE which has a monitoring circuit for each
input included.
c)
When possible, connect each power supply to different phases of the mains network.

27.6. DAISY CHAINING OF OUTPUTS
Daisy chaining (jumping from one power supply output to the next) is allowed as long as the maximum current
through one terminal pin does not exceed 13A. If the current is higher, use a separate distribution terminal block.
Fig. 27-5 Daisy chaining of outputs

Fig. 27-6 Using distribution terminals

max 13A!
+ + - Output+ + - Output+-+ + - Output+ + - Output
+

Load
Power
SupplyPower
SupplyPower
SupplyPower
Supply

Input

Input

Input

Input

-

Load

Distribution
Terminals

27.7. CHARGING OF BATTERIESThe power supply can be used for float-charging of lead-acid or maintenance free 24V VRLA batteries.
Instructions for charging batteries:a) Ensure that the ambient temperature of the power supply does not exceed 50°C.
b) Set the output voltage on a disconnected load, very precisely to the end-of-charge voltage according to the
expected battery temperature.
End-of-charge voltage
Battery temperature
c)
d)
e)
f)

27.8V
10°C

27.5V
20°C

27.15V
30°C

26.8V
40°C

Use a 4A or 6A circuit breaker (or blocking diode ) between the power supply and the battery.
Ensure that the output current of the power supply is below the allowed charging current of the battery.
Use only matched batteries when putting 12V types in series.
The return current to the power supply is typ. 10.7mA at 25Vdc when the power supply is switched off (except incase a blocking diode is utilized).

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 2.1A, SINGLE PHASE INPUT

MiniLine

27.8. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 15A (UL) or 16A (IEC). External protection is only required if
the supplying branch has an ampacity greater than this. In some countries local regulations might apply so check local
codes and requirements.
If an external protective device is utilized, a minimum value is required to avoid undesired tripping of the fuse.
B-Characteristic
max. 15A (UL), 16A (IEC)
min.
10A

Ampacity

C-Characteristic
15A (UL), 16A (IEC)6A

27.9. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any type of load, including unlimited capacitive and inductive loads.

27.10. OPERATION ON TWO PHASES
Fig. 27-7 Schematic for two phase operation

Power Supply
AC

240V +10% max.

L1

L3

L
Fuse

internal
fuse

N
PE

L2

DC

Instructions for two phase operation:a) A phase to phase connection is allowed as long as the
supplying voltage is below 240V+10%.
b) Use a fuse or a circuit breaker to protect the N input. The
N input is internally not protected and is in this caseconnected to a hot wire.
Appropriate fuses or circuit breakers are specified in section 27.6
“External Input Protection”.

27.11. 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 the 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:
Input:

Rittal Type IP66 Box PK 9510 100, plastic, 130x130x75mm
230VacLoad:Temperature inside the box:
Temperature outside the box:
Temperature rise:

24V, 2.1A; load is placed outside the box
40.8°C (in the middle of the right side of the power supply with a distance of 1cm)
21.9°C
18.9K

Load:
Temperature inside the box:
Temperature outside the box:
Temperature rise:

24V, 1.7A; (=80%) load is placed outside the box
38.7°C (in the middle of the right side of the power supply with a distance of 1cm)
21.7°C
17.0K

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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ML50.100, ML50.109
24V, 2.1A, SINGLE PHASE INPUT

MiniLine

27.12. MOUNTING ORIENTATIONSMounting orientations other than input terminals on the bottom and output on the top requires a reduction incontinuous output power or a limitation in the maximum allowed ambient temperature. The amount of reduction
influences the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous
operation can be found below:
Curve A1
Curve A2

Recommended output power.
Max allowed output power (results approx. in half the lifetime expectancy of A1).

Fig. 27-8
Mounting
Orientation A
Standard
Orientation

Output PowerOUTPUT

50W
40
30
20
10
0
10

Power
SupplyINPUT

Fig. 27-9
Mounting
Orientation B(Upside down)

20

30

40

50

60°C

INPUT

50W
40
30
20
10
0
10

A2
A1

Ambient Temperature

20

30

40

50

60°C

Power
SupplyOUTPUT

Output Power

50W
40
30
20
10
0
10

A2
A1

Ambient Temperature

20

30

40

50

60°C

Output PowerOUTPUT

Power
Supply

INPUT

50W
40
30
20
10
0
10

A2
A1

Ambient Temperature

20

30

40

50

60°C

INPUT

Power
SupplyOutput PowerOUTPUT

Fig. 27-12
Mounting
Orientation E(Horizontal ccw)

Ambient Temperature

Output Power

Fig. 27-10
Mounting
Orientation C(Table-top
mounting)

Fig. 27-11
Mounting
Orientation D(Horizontal cw)

A1

50W
40
30
20
10
0
10

A2
A1

Ambient Temperature

20

30

40

50

60°C

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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