Schneider Electric LR9F5371 Solid State Overload Relay

The Schneider Electric LR9F5371 electronic thermal overload relay (TeSys LRF) is an electronic motor protection relay that guards high‑power three‑phase motors from overload and phase failure, typically installed with TeSys F contactors in motor starters, compressors, conveyors, and other heavy‑duty machinery where reliable protection is required. It provides adjustable protection in the 132–220 A range with a Class 10 trip (IEC 60947-4-1) and operates on up to 1000 VAC with a 17–32 V control supply at 50/60 Hz. The unit offers 1 NO and 1 NC auxiliary contacts, mounts directly on a contactor or on a panel, and is compatible with TeSys F contactors in the LC1F185–LC1F265 range, delivering protection for overload, phase loss, and phase imbalance. Reset is manual with a test button, it has IP20 protection, and operates from -20°C to 55°C; common replacements include LR9G225, LR9F5369, and LR9F5571.