Mersen Tri-Onic time-delay/class RK5 fuse. Industry's most popular fuse for motor circuit protection with advanced material technology added to the existing product, the Tri-Onic TR current-limiting time-delay fuses are engineered for overcurrent protection of motors and transformers, service entrance equipment, feeder and branch circuits. Tri- Onic fuse proven time-delay characteristic safely handles harmless starting currents and inrush currents associated with today's motors and transformers. Features: metal embossed date and catalog number for traceability and lasting identification, Fiberglass body provides dimensional stability in harsh industrial settings, high-grade silica filler ensures fast arc quenching and high current limitation. Applications: motor circuits, mains, feeders, branch circuits, transformers, service entrance equipment, general-purpose equipment. Approvals: UL listed to standard 248-12 file E2137. CSA certified to standard C22.2 no. 248.12. 250VAC/250VDC voltage rating. 200kA AC/20kA DC interrupt rating. 2-1/4 ampere current rating. Measures 9/16-inches diameter by 2-inches length.