Industrial EF370-380 Electronic Overload Relay

ABB EF370-380 Electronic Overload Relay, model 1SAX611001R1101, is a self-supplied overload protection device that mounts directly on ABB AF-series contactors (AF265–AF370 and AF210/AF300 variants) to guard 3‑phase motors against overload. It provides a 1 normally open and 1 normally closed contact (1 NC/1 NO) and protects 3‑phase circuits up to 380 A continuous load, with a short‑circuit current rating up to 18 kA SCCR for robust line protection. The unit supports line voltages up to 600 VAC (or 600 V DC) on the motor side, and its coil is rated to withstand up to 1000 VAC, enabling direct integration without an external control power supply. Part of ABB’s EF370 family, it offers selectable trip classes (10E, 20E, 30E) to tune protection to the motor's characteristics and application. Typical uses include motor protection in industrial starters and machinery such as conveyors, pumps, and processing equipment, where compact mounting on standard contactors and precise current-based protection are advantageous.