ABB CM-IWS.1P Insulation Monitoring Relay, 24-240 V AC/DC, 1-100 kΩ, 1 SPDT 1SVR740660R0100

The ABB CM-IWS.1P is an insulation monitoring relay for unearthed AC/DC IT systems. It continuously measures insulation resistance using an active measuring principle and signals when the value falls below the adjustable threshold from 1 kΩ to 100 kΩ. The relay operates on a wide supply voltage of 24-240 V AC/DC and provides one changeover contact for alarm or control circuits.

Advantages

Active measuring principle ensures reliable detection of insulation faults even in complex networks. Wide supply voltage range allows use in various installations without additional power supplies. Adjustable response value and response delay enable adaptation to specific system requirements. Compact DIN rail housing saves space in control cabinets.

Suitable for

• Monitoring insulation in unearthed AC/DC systems (IT systems)
• Industrial control panels and machinery
• Renewable energy installations
• Marine and offshore electrical systems

Key specifications

• Supply voltage: 24-240 V AC/DC
• Measuring voltage: 0-400 V AC/DC
• Adjustable response value: 1-100 kΩ
• Fixed hysteresis: 5%
• Start-up delay: 0.5 s (fixed)
• Response delay: 0.5-10 s (adjustable)
• Output: 1 changeover contact (SPDT), 250 V AC / 4 A
• Mounting: DIN rail (EN 60715)
• Operating temperature: -20 to +60 °C

Recommendations

For reliable insulation monitoring in IT systems, pair the CM-IWS.1P with ABB circuit breakers and surge protective devices to ensure comprehensive protection.