Description
W57 - Allen Bradley - NEMA Overload Relay Heater Element
W57 is a type W eutectic alloy heater element for NEMA overload relays in Allen-Bradley starters, offering Class 20 trip performance. It operates within a full-load current range of approximately 15.7 to 16.4 amps depending on starter size. The unit is non-repairable and provides accurate protection against overload conditions. Commonly used in motor control applications.

