·Some details are not shown. Please refer to specification sheets for all information.

MD73W

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
 

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)
Applicable wire size: 0.2 – 2.5 mm2,  stripped length 8 mm
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)
Nominal current (IN): 400 mA
Internal series resistance: ≤ 2.2 Ω ±20 % per line
Surge protection: IEC 61643-21 Categories C1, C2, D1

STANDARDS & APPROVALS
EU conformity:
ATEX Directive 
  Ex ia EN 60079-11
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
RoHS Directive
  EN 50581
Safety approval:

SAFETY PARAMETERS

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm (inch)

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

M-System Co., Ltd.