Compact Switching Power Supply

MS2 series

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Output Current 2.1 A, 50 W MS2-H50

MS2-H50 - Output Current 2.1 A, 50 W

*Please note that accessories depicted in the image are for illustrative purposes only and may not be included with the product.

Data Sheet (PDF)


CAD Data

360°view (3D PDF)

  • CE Marking
  • UL Listing(c/us)
  • UL Recognition(c/us)




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

Efficiency (100/200 VAC)

82/85% typ. (with 100% load)

Leakage current (100/200 VAC)

0.4/0.75 mA max. (with 100% load)

Rush current (100/200 VAC)

25/50 A max. (with 100% load, at 25°C cold start)

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 %/ ºC max.

Startup time

500 ms max. (at Surrounding Air Temperature of 0 to 55°C under I/O rated conditions)

Output holding time

20 ms min. (at Surrounding Air Temperature of 25°C under I/O rated conditions)


Overcurrent protection

Activates when the current reaches 125% or more of the rated output current. Constant current voltage limiting. Automatic reset 2.7 A min.

Overvoltage protection

Activates when the voltage reaches 26.4 V or more. Voltage turn-off. Operation resumes when the input power isturned on again.*2


Display power

3-digit, 7-segment LED (Character height: 10 mm)

Power off memory time

Approx. 10 years (at 20°C)

Display resolution

0.1A/0.4V /1%

Applicable standards

Safety standards

UL508, UL60950-1
CSA C22.2 No.14, CSA C22.2 No.60950-1
EN60950-1, EN50178

EMC standard

FCC Part15B Class A, EN55011 Class A, EN61000-6-2

Limits for harmonic current emissions



Parallel operation

Possible (OP-42207 is required.)*4

Series operation

Possible (External diode is required.)*4

Cooling method

Natural air-cooling

Environmental resistance

Insulation resistance

100 MΩ min. (with 500 VDC megohmmeter)
(across input and output terminals) (across input terminals and PE terminal)

Ambient temperature

-10 to +55 °C (No freezing) (See "Output conditions".)

Storage temperature

-20 to +70 °C (No freezing)

Relative humidity

25 to 85 % RH (No condensation)

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)

Vibration resistance

10 to 57 Hz, Double amplitude 0.3 mm, 57 to 500 Hz, 19.6 m/s2 (2 G), 5.5-minute cycle, 2 hours in each of the X, Y, and Z directions

Shock resistance

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


Approx. 270 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 lower.
*4 The applicable standards do not apply for parallel and serial operations.

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