CM-IWS - Insulation Monitoring Relays CM-IWS series relays serve to monitor insulation resistance and can be configured to the requirements of the applications. All devices have two different terminal versions: Screw Connection Technology and Easy Connect Technology. Rated control supply voltage 24-240V ac/dc The device can monitor control circuits (single-phase) and main circuits (3-phase) One measuring range 1-100 kΩ Precise adjustment of the threshold value in 1kΩ steps Interrupted wire detection 3 LEDs indicators of operational states 1 c/o (SPDT) contact, closed-circuit principle