MODEL: MDM2A-24

MDM2A-24 SPECIFICATIONS

ES-8214 Rev.8 Page 1/3

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

Lightning Surge Protectors for

Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR

STANDARD SIGNAL LINE & PULSE USE

(life monitor, 24 V DC line voltage)

Functions & Features

• Designed specifically for 4 – 20 mA DC and

pulse signal line including both 4-wire and 2-wire

transmitters

• Absorbs surges only without affecting instrumentation

signal

• Life monitor function helps you to decide when you should

replace the surge protector; reduces maintenance and

prevents downtime

• LED display and alarm contact output indicate the

degradation and life span of the surge protection circuits

29.5 [1.16]

76

[2.99]

124

[4.88]

Model

ALM

PWR

mm [inch]

MODEL: MDM2A–24–[1]

ORDERING INFORMATION

• Code number: MDM2A-24-[1]

Specify a code from below for [1].

(e.g. MDM2A-24-M2)

[1] POWER INPUT

AC Power

M2: 100 – 240 V AC (Operational voltage range 85 – 264 V,

47 – 66 Hz)

DC Power

R: 24 V DC

(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

P: 110 V DC

(Operational voltage range 85 – 150 V, ripple 10 %p-p max.)

GENERAL SPECIFICATIONS

Construction: Plug-in

Connection: M3 screw terminals (torque 0.8 N·m)

Housing material: Flame-resistant resin (black)

Alarm indicators

PWR: The green LED turns on while the power is supplied.

ALM: Tricolor LED (green/amber/red)

· Remains off when the power supply is first turned on.

· Green: The unit has received one or more surges.

· Amber: Replacement is recommended.

· Red: The life span has ended.

Degradation judged: When the leakage current at the

voltage limiter exceed approx. 7.5 μA.

Life time judged: When the number of discharges of the

discharge element reaches the expected life span.

Alarm output: The N.C. contact is on when the life span of

the discharge elements has ended, when the voltage limiter

has degraded, and/or when the power supply is removed.

Rating: 125 V AC @ 0.5 A (cos ø = 1)

30 V DC @ 1 A (resistive load)

Maximum switching voltage: 125 V AC or 110 V DC

Maximum switching power: 62.5 VA or 30 W

Minimum load: 5 V DC @ 1 mA

INSTALLATION

Power consumption

•AC: Approx. 2 VA at 100 V

Approx. 3 VA at 200 V

Approx. 4 VA at 240 V

•DC: Approx. 1.5 W

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

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

Mounting: Surface or DIN rail

Weight: 150 g (0.33 lb)

PERFORMANCE

Discharge voltage (peak voltage)

Line to line: 30 V min.

Line to ground: ±300 V min.

Maximum surge voltage

Line to line: 45 V max.

Line to ground: ±650 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: ≤ 5 μA @ 30 V DC

Line to ground: ≤ 5 μA @ ±140 V DC

Discharge current capacity: 5000 A (8 / 20 μsec.)

Max. load current: 100 mA

Insulation resistance: ≥ 100 MΩ with 500 V DC

(surge protector circuit to alarm output to power)

Dielectric strength: 2000 V AC @ 1 minute