The Mersen (formerly Ferraz Shawmut) Tri-Onic TR100R is the industry's preferred time-delay fuse for reliable motor circuit protection, combining advanced current-limiting technology with UL Class RK5 certification to safeguard motors, transformers, and service entrance equipment. Engineered for both time-delay and current-limiting performance, it handles inrush currents on motor start-up without nuisance tripping, making it ideal for demanding industrial and commercial job sites. With a 200kA AIC rating at 250V, it delivers robust overcurrent protection for feeders, branch circuits, and general-purpose equipment across a wide range of applications.

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