ABB ungrounded system insulation monitor CM-IWN.1S/10108134. CM Monitoring Relay Model No: CM-IWN.1S. The CM-IWN.1S serves to monitor insulation resistance in accordance with IEC 61557-8 in unearthed IT AC systems, IT AC systems with galvanically connected DC circuits, or unearthed IT DC systems with a voltage up to 400 V AC and 600 V DC. The measuring range can be extended up to 690 V AC and 1000 V DC by using the coupling unit CM-IVN. It can be configured to the requirements of the applications and therefore used multi-functional. ABB ungrounded system insulation monitor
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