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 TRS 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 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 and DC listed to UL standard 248. 600VAC/600VDC voltage rating. 200kA AC/100kA DC interrupt rating. 225 ampere current rating. Measures 2 9/16 inches diameter by 11 5/8 inches length.