ABB 1SVR730660R0100 CM-IWS.1S Insulation and Earth Fault Monitoring Relay 1 C/O 1-100kΩ 24-240VAC/DC

The ABB CM-IWS.1S insulation and earth fault monitoring relay (SKU: 1SVR730660R0100) continuously monitors insulation resistance in ungrounded AC and DC systems, tripping its 1 change-over (C/O) output when resistance falls below a user-selectable threshold between 1 and 100 kΩ. Designed for demanding industrial control panel environments, the CM-IWS.1S operates across a wide supply voltage range of 24–240 V AC/DC, making it a versatile choice for global applications.

Technical Specifications

Certifications & Standards

• IEC 61557-8: Insulation monitoring devices for IT systems
• IEC/EN 61557-1: General requirements for measuring equipment for electrical safety
• IEC/EN 61557-8: Insulation monitoring devices for IT systems (EN harmonised)
• IEC/EN 61326-2-4: EMC requirements for portable test and measurement equipment
• IEC/EN 63000: Technical documentation for evaluation of electrical and electronic products with respect to hazardous substances
• IEC 60715: Dimensions of low-voltage switchgear and controlgear — DIN rail mounting
• UL 508: Standard for industrial control equipment (USA)
• CAN/CSA C22.2 No.14: Industrial control equipment (Canada)
• cULus: Listed for both US (UL) and Canadian (CSA) markets
• CE: European conformity marking
• UKCA: UK Conformity Assessed marking for Great Britain market
• CCC: China Compulsory Certification
• REACH: EU regulation on chemicals — compliant
• RoHS: Restriction of hazardous substances — compliant

Applications & Use Cases

• Continuous insulation monitoring in ungrounded (IT) AC and DC power systems
• Earth fault detection in industrial machinery and control panels
• Protection of medical, marine, and process plant electrical installations
• Early warning systems preventing unplanned shutdowns due to insulation degradation
• Building automation and infrastructure applications requiring 24–240 V AC/DC flexibility