MODEL: MH-205A

MH-205A SPECIFICATIONS

ES-8176-B Rev.9 Page 1/3

http://www.m-system.co.jp/

Lightning Surge Protectors for

Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR POWER SUPPLY USE

(5 A, 200 / 220 / 240 V AC)

Functions & Features

• Designed specifically for power requirements of medium

capacities

• Protecting electronic equipment from lightning surges that

enter through substations and step-down transformers

• Discharge element failure triggers the fuse blown and

alarm contact closed

• Also effective in rejecting switching transients generated

by thyristors, circuit breakers, motor starters, etc.

Typical Applications

• Control panels

• Telemetering systems

80 (3.15)

250 (9.84)

mm (inch)

147 (5.79)

MODEL: MH–205A

ORDERING INFORMATION

• Code number: MH-205A

GENERAL SPECIFICATIONS

Connection: M4 screw terminals (torque 1.6 N·m)

Screw terminal: Nickel-plated brass

Housing material: Steel plate t = 1.6 (black)

Alarm indicator: Discharge element failure indicator turns

white when the fuse is blown.

Monitor lamp: Red neon lamp turns on when the power is

supplied.

Alarm relay contact: Turns ON with discharge element

failure (when the fuse is blown)

•Rated load: 100 V AC @ 250 mA (cos ø = 1)

100 V DC @ 250 mA (resistive load)

•Maximum switching voltage: 125 V AC or 125 V DC

•Maximum switching power: 25 VA or 25 W

•Minimum load: 5 V DC @ 10 mA

INSTALLATION

Operating temperature: -5 to +55°C (23 to 131°F)

Operating humidity: 30 to 90 %RH (non-condensing)

Mounting: Surface

Weight: 3.0 kg (6.6 lb)

PERFORMANCE

Discharge voltage (peak voltage)

Line to line: 410 V min.

Line to ground: 410 V min.

Maximum surge voltage

Line to line: 700 V max.

Line to ground: 700 V max.

(The maximum voltage that could pass through M-RESTER.

Protected equipment must be able to withstand this voltage

for very short time period.)

Response time: ≤ 0.1 μsec.

Leakage current

Line to line: ≤ 1 mA at 300 V DC

Line to ground: ≤ 1 mA at 300 V DC

Discharge current capacity: 10000 A (8/ 20 μsec.)

Maximum load current: 5 A

Voltage drop: ≤ 2 V (50/60 Hz)

Rated line voltage: 200 V / 220 V / 240 V AC