SPD for RS-485 or RS-422 signal circuits.

Nominal Breakdown Voltage
8.2V (at 10mA)
Breakdown Tolerance
Maximum Operating Voltage
Maximum Circuit Current
2mA max (at 6.63V)
Impulse Discharge Current
Category C2: 8/20µs-5kA, 5 times for each positive and negative
Category D1: 10/350µs-2.5kA, 1 time for each positive and negative
Maximum Sparkover Voltage at Tront of Wave Lightning Impulse 10,000V/µs (V)
Operating Temperature


  • Compliance with JIS C 5381-2 and category C2/D1
  • Longer impulse current life and high impulse current withstanding capabilities than previous version (RSP-485M)
  • DIN rail option


  • Data processing machine and control machine with RS-485 or RS-422 line
  • Fire alarm apparatus system
  • Security camera
  • Coin-operated parking
  • Outdoor display unit