ABB CM-IWx Insulation Monitoring Relay

Reliable insulation monitoring of IT systems

CM-IWx insulation monitoring relays ensure continuous insulation monitoring of IT systems to minimize equipment downtime.

ABB's CM-IWx insulation monitoring relays for IT systems provide continuous, reliable monitoring.

These devices recognize an insulation fault as it develops and trip once the value falls below a minimum set threshold.

This makes the system more reliable and prevents interruptions caused by severe secondary insulation faults.

Make your monitoring safer and your maintenance smarter with the CM-IWx insulation monitoring relay.

Continuous operation

Reduce downtime with early warning

More time for planned maintenance

Early fault detection by monitoring voltage-free networks

Railroad and marine approved models available

Safety and Protection

Safe and reliable insulation fault detection

Compliance with the latest standards

Solutions for standard and challenging applications

Fast and reliable earth fault detection supports fire protection

Self-diagnostics and wire break detection

Easy to install

Clear indication of device status via LEDs

Easily adjusted using a rotating wheel

Push-in terminals

Features

System voltage monitoring up to 1500 V DC and 1100 V AC

System leakage capacitance monitoring up to 3000 μF

Versatile system monitoring for 2-wire, 3-wire, 4-wire and battery systems

Easily configurable wire break detection

Easily configurable non-volatile fault storage

Isolated systems are often used when an extremely reliable power supply must be guaranteed, such as in emergency lighting systems.

Since the energy released in the event of an earth fault is not sufficient to trigger a circuit breaker or a residual current circuit breaker, different protective devices must be used in the earthbound system.

Insulation monitors continuously determine the insulation resistance to earth and signal if a threshold value is exceeded.

Insulation monitoring relays are the only technical solution for detecting earth faults in unearthed systems.