The ABB 1SVR730794R1300 is a CM-PVS.31S three-phase over- and undervoltage monitor for 3-phase mains from 160 to 300 VAC, with a DPDT relay output and an adjustable time delay from 0.1 to 30 seconds.
The 160-300 VAC range covers standard 208-277 V three-phase networks, including 240 V delta and 277/480 V wye systems where the monitor is connected phase-to-neutral. The DPDT relay provides independent NO/NC contacts for alarm or trip circuits. The 0.1-30 s time delay prevents nuisance trips during momentary sags or motor starting inrush.
Panel builders and maintenance teams install this monitor in motor control centers, distribution boards, and process skids to protect three-phase loads from phase loss, undervoltage, and overvoltage conditions.