ES-8214 Rev.10

MDM2A-24

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

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
(surge protector circuit to power to ground)
Internal series resistance: 20 Ω ±10 % (including return)
Maximum line voltage: 30 V

STANDARDS & APPROVALS

EU conformity:
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
Low Voltage Directive
  EN 61010-1
  Measurement Category II (alarm output)
  Installation Category II (power)
  Pollution degree 2
  Surge protector circuit to power: 
  Reinforced insulation (300 V)
RoHS Directive

CONNECTION EXAMPLES

GROUNDING

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM