Mersen TR400R Class RK5 Time-Delay Fuse | 400A, 250 V AC

The Mersen TR400R is a 400-amp, 250 VAC/VDC Class RK5 time-delay fuse from the Tri-Onic® TR-R series, designed to provide reliable overcurrent protection for motors, transformers, service entrance equipment, feeders, and branch circuits. Its time-delay feature allows it to handle harmless starting and inrush currents without nuisance openings, making it ideal for applications with fluctuating loads. The fuse is current-limiting, reducing peak let-through current to protect downstream components, and features a rejection-style blade terminal design to prevent replacement errors. Constructed with a durable fiberglass-reinforced PolyTube body and filled with high-grade silica for efficient arc quenching, the TR400R ensures high performance in demanding environments.