Bussmann 64400 Welder Limiter Class J 400A 600V Fuse

Bussmann 64400 Welder Limiter is a Class J current-limiting fuse designed specifically for welding circuits, rated 400 A and 600 V, and intended for use with Class J fuseholders only. Its time-current characteristics are tuned to tolerate the intermittent overloads typical of welding while delivering short-circuit protection to the welding power system, featuring an interrupting rating of 200,000 AIC at 600 V. The 64400 is part of Bussmann's Welder Limiter family (64200, 64300, 64400, 64600) and is specified for a maximum of 600 V AC. This limiter is not intended for general-use circuits and is intended to protect welding transformers, arc welders, and related welding equipment by limiting surge and fault currents without prematurely tripping during normal welding transients. Designed for use in Class J fuseblock assemblies, the 64400 helps safeguard both power sources and welding cables while maintaining proper arc performance in demanding welding applications.