ABB EF45-45 Overload Relay

ABB EF45-45 Electronic Overload Relay is a self-supplied, three-pole electronic motor protection device that guards 3-phase motors against overload and phase failure without needing an external power source. It is designed to mount in line with standard ABB 3-pole contactors (AF26-compatible) to provide fast, reliable protection in motor-start circuits. The EF45-45 is rated for In = 45 A and covers the EF45 family’s 15–45 A range on 50/60 Hz systems, suitable for motor circuits up to 690 VAC, with a compact enclosure that is IP20 rated and operable from -25 to 70 C. Its physical dimensions are about 3.35 in high, 1.77 in wide, and 3.38 in deep and feature threaded terminals for wiring. The protection logic is powered by the line current, eliminating the need for external energy, and catalog entries show trip-class options such as 10E and 20E (with some variants listed for 30). Common ABB references for this model include 1SAX221001R1102, with EF45-45 listed as the alternate catalog number. This overload relay is intended for motor protection in applications like pumps, fans, conveyors and compressors within industrial control panels.