ABB CM-IWx Insulation Monitoring Relay Features

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.