EF370-380 is ABB’s self-supplied electronic overload relay in the EF370 family, engineered to provide motor overload protection by monitoring current on 3‑phase circuits. It covers a motor current range of 115–380 A and offers selectable trip classes of 10E, 20E, or 30E, with no external power supply required. The unit is designed for use with ABB AF/EF370 contactor assemblies (EF370 frame) and uses screw-terminal wiring for straightforward installation. The device carries ABB order code 1SAX611001R1101 and weighs about 1.43 kg per unit, aligning with its documented EF370-380 designation in ABB’s motor protection catalog and distributor listings.
