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2018/08/29 | KEYENCE MS2-H50




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. (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)

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

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

Insulation resistance

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

Ambient temperature

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

Storage temperature

-20 to +70 °C -4 to 158 °F (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 0.01", 57 to 500 Hz, 19.6 m/s2 (2 G), cycle: 5.5 minutes, 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