Westinghouse 1265539-B BY65 Overload Relay Heater

The Westinghouse 1265539-B BY65 Overload Relay Heater is a plug-in steel thermal overload heater element for Westinghouse motor starters and relay assemblies. It generates heat proportional to motor current to trip the overload relay under excessive current, delivering thermal overload protection for AC motors in industrial motor control centers, magnetic starters, conveyors, pumps, compressors, fans, and other machinery. Designed for plug-in installation, this BY65 heater element (alternate marking A65) fits compatible Westinghouse Thermal Overload Relays and uses a melting alloy thermal trip element as its sensing mechanism. Key specs include dimensions of 1-7/16 in. by 1 in., construction material steel, mounting style plug-in, and installation type overload relay heater replacement, with a focus on motor overload protection and starter maintenance in industrial electrical applications. Common replacements include Eaton BY65 and Cutler-Hammer BY65 heater elements, reflecting BY-series compatibility for motor control equipment.