ES-8185 Rev.2
MMDH
Lightning Surge Protectors for
Electronics Equipment M-RESTER
LIGHTNING SURGE PROTECTOR FOR
STANDARD SIGNAL LINE USE
(high speed/high discharge current capacity)
Functions & Features
• Designed specifically for 4 – 20 mA DC line including both 4-wire and 2-wire transmitters
• Discharge current capacity 20000 A
• Absorbing surges only without affecting instrumentation signal
Typical Applications
• High discharge current capacity is beneficial for use in area with frequent lightnings
MODEL: MMDH–24
ORDERING INFORMATION
• Code number: MMDH-24
OPERATIONAL VOLTAGE
24
: 24 V DC
RELATED PRODUCTS
•Lightning arrester for power supply use (model: MMAH)
GENERAL SPECIFICATIONS
Construction
: Wall-mounted, front terminals; terminal cover provided
Connection
: M4 screw terminals (torque 0.8 N·m)
Screw terminal
: Nickel-plated steel
Housing material
: Steel plate t = 1.6 (black)
INSTALLATION
Operating temperature
: -5 to +55°C (23 to 131°F)
Operating humidity
: 30 to 90 %RH (non-condensing)
Mounting
: Surface
Weight
: 440 g (0.97 lb)
PERFORMANCE
Discharge voltage (peak voltage)
Line to line: ±40 V min.
Line to ground: ±290 V min.
Maximum surge voltage
Line to line: ±50V max.
Line to ground: ±800 V max.
(The maximum voltage that could pass through this surge protector. Protected equipment must be able to withstand this voltage for very short time period.)
Response time
: 4 nsec.
Leakage current
Line to line: ≤ 5 μA at ±30 V DC
Line to ground: ≤ 5 μA at ±140 V DC
Discharge current capacity
: 20000 A (8 / 20 μsec.)
Maximum load current
: 0.1 A
Internal series resistance
: ≤ 0.4 Ω (including return)
Maximum line voltage
: ±30 V
CONNECTION EXAMPLES
GROUNDING
DIMENSIONS unit: mm (inch)
MOUNTING REQUIREMENTS unit: mm [inch]
SCHEMATIC CIRCUITRY