The devices of the RM475 series in conjunction with a terminating device are designed to monitor a closed and voltage-free loop for interruption (series resistance) and for short-circuit (cross resistance). The RM475 version has a continuously set response value for series and cross resistance. The response time is max. 1 s.

The response value for the series resistance of device version RM475LY can be adjusted between 50…500 Ω. The response value for the cross resistance for this version, however, is continuously set, too. The response time can be set between 1…10 s.

  • Features
  • Applications
  • Accessories
  • Ordering information
  • Downloads
  • RM475: permanently set response value: Series resistance 200 Ω, Cross resistance 1000 Ω
  • RM475LY: Series resistance, adjustable 50…500 Ω, Cross resistance 1000 Ω
  • Adjustable response delay 1…10 s (RM475LY)
  • N/O or N/C operation, selectable
  • Fault memory behaviour selectable
  • Internal/external test/reset button
  • LEDs: Power On LED, alarm LEDs
  • LED bar graph for series resistance
  • 2 potential-free changeover contacts
  • Modular DIN rail enclosure
  • Monitoring of conductors and cables by means of a monitoring conductor
  • Monitoring of PE loops


Optional accessories for RM475/RM475LY

TypeSupply voltage USArt. No.
EV22Sterminating deviceB984800

Variants of RM475/RM475LY

TypeSupply voltage USArt. No.
RM475AC 230 V, 50…60 HzB97022001
RM475-13AC 90…132 V, 50…60 HzB97022002
RM475-15AC 400 V, 50…60 HzB97022003
RM475-16AC 500 V, 50…60 HzB97022004
RM475-21DC 9,8…84 VB97022005
RM475-23DC 77…286 VB97022006
RM475LYAC 230 V, 50…60 HzB97022007
RM475LY-13AC 90…132 V, 50…60 HzB97022008
RM475LY-15AC 400 V, 50…60 HzB97022009
RM475LY-16AC 500 V, 50…60 HzB97022010
RM475LY-21DC 9,8…84 VB97022011
RM475LY-23DC 77…286 VB97022012

Downloads for RM475/RM475LY



Category Product Language Date Size Download