ABB CM-IWN.5S 1SVR750660R0400 CM-IWN Series Insulation Monitoring Relay

Overview The ABB CM-IWN.5S (1SVR750660R0400) is an insulation monitoring device for unearthed IT power systems. It continuously monitors the insulation resistance between live conductors and earth, widely stocked as spare for marine, medical and industrial IT distribution panels.

Features This CM-IWN.5S supports adjustable insulation resistance threshold and delay time. The CM-IWN.5S 1SVR750660R0400 provides relay alarm output, LED status indication, fault memory and test function. It is DIN rail mounted, with internal measuring circuit and can detect gradual insulation degradation before earth fault occurs.

Specs Model: CM-IWN.5S, Part No.:1SVR750660R0400 Series: ABB CM-IWN Type: Insulation monitoring relay Applicable system: IT unearthed AC/DC network Mounting: DIN rail Protection class: IP20 Certifications: CE, IEC 61557-8 Product status: active electrical spare

Principle The module injects a low measuring signal into the IT network and calculates insulation resistance value. When resistance drops below the preset limit, the relay contact switches to trigger alarm, helping avoid dangerous earth fault and power interruption.

Applications The CM-IWN.5S 1SVR750660R0400 is widely deployed on ships, medical isolation power supplies and industrial IT distribution cabinets. It is used for insulation supervision of unearthed power systems.