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Insulation monitoring relays

Reliable insulation monitoring of your IT system

The insulation monitoring relays of the CM-IWx range guarantee a continuous insulation monitoring of an IT system. The devices recognize insulation faults as they develop and trip immediately if the value has fallen below the minimum set threshold. This ensures a reliable operation of the system and prevents operational interruption caused by a second, more severe, insulation fault which may lead to a short circuit tripping the main circuit breaker.


Main benefits

Continuous operation

  • Down-time reduction by providing early pre-warnings. Gaining time for maintenance planning
  • Monitoring of voltage free networks for early fault detection
  • Variants with rail & ship approvals

Safety and Protection

  • Safe and reliable detection of insulation faults according latest standards
  • Attractive portfolio for standard as well as more challenging applications
  • Can prevent fire due to fast and reliable earth fault detection
  • Built-in self-diagnosis and interrupted wire detection

Easy to Install

  • Clear visualization of device status via LEDs
  • Easy to adjust with rotary wheels
  • Variants with push-in terminals

Main features

  • Monitoring of system voltages up to 1500 V DC and 1100 V AC
  • Monitoring of system leakage capacitances up to 3000 µF
  • All kind of systems can be monitored: 2-wire, 3-wire, 4-wire as well as battery systems
  • Interrupted wire detection configurable
  • Non-volatile fault storage configurable

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