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.

Specifications

Brand Mersen (Ferraz Shawmut)
Series Tri-Onic TR
Amperage 100 A
Voltage Rating 250 V
UL Class RK5
AIC Rating 200 kA @ 250 V
Fuse Type Time-Delay, Current-Limiting
Indicating Non-Indicating
Terminal Type Ferrule (Rejection)
Dimensions 5 7/8" x 1 1/16"
Applications Motor Circuits, Mains, Feeders, Branch Circuits, Transformers, Service Entrance Equipment, General-Purpose Equipment