The ABB 1SVR740670R0200 is a CM-IWS.2P insulation monitoring relay. It continuously monitors the insulation resistance of an ungrounded AC or DC system and trips an alarm when resistance falls below a set threshold. This is the relay that sits between your supply and the load, watching for the first signs of insulation degradation before a ground fault takes the line down.
Integration note
Mounts on a DIN rail inside the control panel. The CM-IWS.2P is a two-wire connection to the monitored line — no separate supply voltage needed for the measurement circuit. Verify the setpoint range matches your system voltage before wiring; the relay's own supply is drawn from the monitored network.