ABB Insulation monitoring relays


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 falls 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 trip of the main circuit-breaker.