MODEL: MD73W

MD73W SPECIFICATIONS

ES-8061 Rev.7 Page 1/3

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

Lightning Surge Protectors for

Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR

THREE-WIRE SIGNAL LOOP

(ultra-slim)

Functions & Features

• High discharge current capacity 20 kA (8 / 20 μs), 1 kA (10

/ 350 μs)

• Ultra-thin 7-mm-wide module can be mounted

in high density

• Excellent protection employing multi-stage SPD circuits

• DIN rail mounting and grounding

Typical Applications

• Protecting a 3-wire transmitter loop

• Protecting an electronic device I/O

7 (.28)

98

(3.86)

mm (inch)

95

(3.74)

MODEL: MD73W–32[1][2]

ORDERING INFORMATION

• Code number: MD73W-32[1][2]

Specify a code from below for each [1] and [2].

(e.g. MD73W-320/Q)

For the safety approval code 2, specify the product’s

destination country using Ordering Information Sheet (No.

ESU-8057).

• Specify the specification for option code /Q

(e.g. /C01)

NOMINAL VOLTAGE

32: 32 V DC

[1] SAFETY APPROVAL

0: None

2: CENELEC intrinsic safety (ATEX)

[2] OPTIONS

blank: none

/Q: With options (specify the specification)

(CENELEC intrinsic safety (ATEX) not available)

SPECIFICATIONS OF OPTION: Q

COATING (For the detail, refer to M-System's web site.)

/C01: Silicone coating

/C02: Polyurethane coating

GENERAL SPECIFICATIONS

Construction: Slim-sized front terminal structure

Degree of protection: IP20

Connection: Euro terminal block (torque 0.3 N·m)

Grounding: DIN Rail

Housing material: Flame-resistant resin (black)

INSTALLATION

Operating temperature: -25 to +85°C (-13 to +185°F)

(See Safety Parameters for use in a hazardous location.)

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

Mounting: DIN Rail (TH35-7.5, 1-mm-thick)

Oxide film on the surface of an aluminium DIN rail may

lower the electric conductivity between this module and the

ground. Use a steel or copper rail.

Weight: 70 g (2.5 oz)

PERFORMANCE

Max. continuous operating voltage (Uc):

Line to line: ±32 V

Line to earth: ±32 V

Voltage protection level (Up) @ 6 kV (1.2 / 50 μs):

Line to line: ±60 V

Line to earth: ±60 V

Response time:

Line to line: ≤ 4 nsec.

Line to earth: ≤ 20 nsec.

Leakage current @Uc:

Line to line: ≤ 5 μA

Line to earth: ≤ 5 μA

Max. discharge current (Imax): 20 kA (8 / 20 μs); 1.0 kA (10

/ 350 μs)

Internal series resistance: ≤ 2.2 Ω ±20 % per line

Surge protection: IEC 61643-21 Categories C1, C2, D1