ES-8228 Rev.5

MD-LC2

Lightning Surge Protectors for
Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR
STRAIN GAUGE USE

(6-wire remote sensing)
Functions & Features
•Designed to protect strain gauge transmitters from lightning surge damage that enters on the wiring between the strain gauge and the transmitter
•Six-wire remote sensing
•Absorbing surges only without affecting instrumentation signal

MODEL: MD–LC2

ORDERING INFORMATION

• Code number: MD-LC2

GENERAL SPECIFICATIONS

Construction: Plug-in
Connection: M3.5 screw terminals
Housing material: Flame-resistant resin (black)

INSTALLATION

Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 250 g (0.55 lb)

PERFORMANCE

Maximum line voltage
  Signal (L1 to L2): ±0.3 V
  Excitation (+ to –): 15 V
  Excitation (S+ to S–): 15 V
  Signal (L1, L2) to ground: ±15 V
  Excitation (+, S+) to ground: +30/-15 V
  Excitation (–, S–) to ground: ±15 V
Discharge voltage (peak voltage)
  Signal (L1 to L2): ±0.3 V min.
  Excitation (+ to –): 15 V min.
  Excitation (S+ to S–): 15 V min.
  Signal (L1, L2) to ground: ±15 V min.
  Excitation (+, S+) to ground: +30/-15 V min.
  Excitation (–, S–) to ground: ±15 V min.
Maximum surge voltage
  Signal (L1 to L2): ±20 V max.
  Excitation (+ to –): 40 V max.
  Excitation (S+ to S–): 40 V max.
  Signal (L1, L2) to ground: ±40 V max.
  Excitation (+, S+) to ground: +65/-40 V max.
  Excitation (–, S–) to ground: ±40 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: 4 nsec.
Leakage current
Signal (L1 to L2): ≤ 0.2 µA at ±0.3 V DC
  Excitation (+ to –): ≤ 2 µA at 15 V DC
  Excitation (S+ to S–): ≤ 2 µA at 15 V DC
  Line to ground: ≤ 2 µA at ±15 V DC
Discharge current capacity: 5000 A (8 / 20 μsec.)
Internal series resistance and max. load current
Signal (L1, L2) each: approx. ≤ 10 Ω; max. 100 mA
  Excitation (+, –) each: approx. ≤ 4 Ω; max. 200 mA
Excitation (S+, S–) each: approx. ≤ 10 Ω; max. 100 mA

CONNECTION EXAMPLES

GROUNDING

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]