Asea Brown Boveri 1SVR730831R0300 Industrial Relay

ABB CM-ESS.1S Voltage Monitoring Relay, model 1SVR730831R0300, provides a single-changeover (SPDT) output for signaling when the monitored voltage deviates from preset limits and is designed for control-supply voltage of 110–130 V AC. It accepts four selectable measuring ranges—3–30 V, 6–60 V, 30–300 V, and 60–600 V VRMS—covering low- to high-voltage monitoring in industrial panels. The device switches via 1 c/o (SPDT) contacts, with an output circuit rated up to 300 V AC and a UL/CSA rating of B300, and uses screw terminals for connections with flexible (18–14 AWG or 18–16 AWG) or rigid (20–12 AWG or 20–14 AWG) conductors. Physical dimensions are 22.5 mm wide, 85.6 mm high, and 103.7 mm deep, with a net weight of 0.164 kg, and it carries a tightening torque of 7.08 in·lb for the terminal screws. The housing provides IP50 protection and RoHS-compliant construction, suitable for operation from -20 to +60 °C (storage -40 to +85 °C). Applications include electrical distribution, machine control, and industrial automation where monitoring for undervoltage or overvoltage is required, enabling timely alarms or control actions in control panels and power circuits. This ABB voltage monitoring relay is part of the CM-ESS.1S family and is intended as a compact, reliable monitoring solution for single-phase systems in harsh industrial environments.