The ABB 1SVR730794R1300 is a three‑phase monitoring relay from ABB’s “CM‑PVS.31S” series. It is designed to monitor three‑phase power supply (L1‑L2‑L3) for correct phase sequence, phase presence (no phase loss), and over‑/under‑voltage. If a phase failure, wrong phase order (phase rotation), undervoltage or overvoltage is detected (and thresholds are exceeded), the relay trips — opening its output contacts to protect motors or loads. The device supports adjustable trip delays and optional on‑ or off‑delay operation, to avoid nuisance trips during supply transients. It is compact, DIN‑rail mountable, with screw‑terminal connections, making it suitable for control panels, motor control centers (MCC), switchgear or industrial/commercial installations needing phase‑failure protection.
