Compact Switching Power Supply

MS2 series

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Input conditions

Input voltage

85 to 264 VAC, 110 to 370 VDC*1


47 to 63 Hz, DC*1


Input current (100/200 VAC)

1.3/0.7A or less

1.9/0.9A or less

2.1/1.3A or less

2.2/1.1A or less

3.9/1.8A or less

Efficiency (100/200 VAC)

82, 85% typ. (at 100% load)

Leakage current (100/200 VAC)

0.4, 0.75 mA or less (at 100% load)

Rush current (100/200 VAC)

25, 50 A or less (at 100% load with a +25°C 77°F cold start)

18/36A or less

Output characteristics

Rated voltage


Variable voltage range

±5% (with V.ADJ)

Rated current

2.1A (Class2)





Ripple/noise voltage

180mV (p-p) or less

Input fluctuation

0.4% or less

Load fluctuation

1.5% or less

Temperature fluctuation

0.02%/°C or less

Startup time

500 ms or less (when the ambient usage temperature is between 0 and +55°C 32 and 131°F with rated I/O conditions)

Output holding time

20 ms or more (when the ambient usage temperature is +25°C 77°F and with rated I/O conditions)


Overcurrent protection

Constant current drop method, automatic recovery, 2.7 A or more

Constant current drop method, automatic recovery, 4.0 A or more

Constant current drop method, automatic recovery, 5.3 A or more

Constant current drop method, automatic recovery, 7.9 A or more

Constant current drop method, automatic recovery, 15.6 A or more

Overvoltage protection

Activates at 26.4 V or more, voltage interruption method, recovers when input is applied again*2


Display power

3-digit 7-segment LED (character height: 10 mm 0.39")

Power off memory time

Approx. 10 years (at +20°C 68°F)

Display resolution

0.1A/0.4V /1%

Applicable standards

Safety standards

UL: UL508, UL60950-1; C-UL: CSA C22.2 number 14-M95, CSA C22.2 number 60950-1-03; EN: EN60950-1, EN50178; IEC: IEC60950-1

EMC standard

FCC Part 15 B Class A, EN55011 Class A, EN61000-6-2

Limits for harmonic current emissions



Parallel operation

Possible (requires OP-42207)*4

Series operation

Possible (requires external diode)*4

Cooling method

Natural air cooling

Environmental resistance

Operating temperature range

-10 to 55°C 14 to 131°F, No freezing (see the derating characteristics)

Operating ambient humidity

25 to 85% RH (No condensation)

Ambient temperature for storage

-20 to +70°C -4 to 158°F(no freezing)

Withstand voltage

3.0 kVAC 50/60 Hz 1 min (across input and output terminals), 2.0 kVAC 50/60 Hz 1min (across input terminals and PE terminal), 500 VAC 50/60 Hz 1min (across output terminals and PE terminal)

Shock resistance

Peak acceleration: 300 m/s2, 2 times in each of the X, Y, and Z directions


10 to 57 Hz: 0.3 mm 0.01" double amplitude; 57 to 500 Hz: 19.6 m/s2 (2 G), cycle: 5.5 minutes; for 2 hours in each of the X, Y, and Z directions

Insulation resistance

100 MΩ or more at 500 VDC (between input and output, between input and FG, and between output and FG)


Approx 270 g

Approx 470 g

Approx 490 g

Approx 700 g

Approx 1540 g

*1 The rated input voltage and rated frequency when applying for safety standards are 100 to 240 VAC, 50/60 Hz.
*2 To return, turn OFF the input power supply and after leaving it off for 1 minute or more, plug in the input power supply again. The E/F Series is a Zener diode clamp type. It will not restart after the protection circuit operation.
*3 For the MS2-H100, this is applicable only when the load ratio is 70% or less.
*4 The applicable standards do not apply for parallel and serial operations.

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