The ABB 1SVR730794R3300 (also known as CM‑PVS.41S) is a three‑phase monitoring relay designed to monitor supply for correct phase sequence, phase presence, and over‑/under‑voltage conditions. It continuously checks a three‑phase supply (L1‑L2‑L3) and will trigger its output contacts if a phase failure, phase reversal, undervoltage or overvoltage is detected, optionally after an adjustable delay. The relay is DIN‑rail mountable, compact (22.5 mm width), and suited for control panels, motor control centers (MCCs), switchgear, or other installations where supply‑phase integrity is critical. It's typically used to protect three‑phase motors, compressors, pumps or sensitive equipment from unsafe supply conditions.
