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

MDW2A-4R

Lightning Surge Protectors for
Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR
RS-485 / RS-422
(life monitor)

Functions & Features
•Designed specifically for RS-485 or RS-422 transmission line
•Life monitor function helps you to decide when you should replace the M-RESTER; reduces maintenance and prevents downtime
•LED indicator and alarm contact output indicate the degradation and life span of the surge protection circuits

MODEL: MDW2A–4R–[1]

ORDERING INFORMATION
• Code number: MDW2A-4R-[1]
 Specify a code from below for [1].
(e.g.MDW2A-4R-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.)

APPLICABLE NETWORK
RS-485 or RS-422 conformed network: Modbus, SINNET, MsysNet

GENERAL SPECIFICATIONS
Construction: Plug-in
Connection: M3 screw terminals (torque 0.8 N·m)
Screw terminal: Chromated steel
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. 0.25 mA.
Life time judged: When the number of discharges of the discharge element reaches the expected life span.
Alarm contact: The N.C. contact is on when the life span of the discharge elements has ended, when the voltage limiter has degraded 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 @ 10 mA

INSTALLATION
Power consumption
AC:
Approx. 3 VA at 100 V
Approx. 4 VA at 200 V
Approx. 5 VA at 240 V
DC: Approx. 2 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: 200 g (0.44 lb)

PERFORMANCE
Insulation resistance: ≥ 100 MΩ with 500 V DC
(surge protector circuit to alarm output to power)
Dielectric strength: 2000 V AC @ 1 minute
(surge protector circuit to power to ground)

EXTERNAL VIEW

CONNECTION EXAMPLES

GROUNDING

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm (inch)

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

M-System Co., Ltd.