Cooper Bussmann FRS-R-600 Fusetron Time Delay Fuse

Cooper Bussmann FRS-R-600 Fusetron Time-Delay Fuse is a heavy-duty, dual-element protection device from the Bussmann Series RK5 family. Rated for 600 A and 600 Vac / 300 Vdc, this 600 A time-delay fuse is designed to withstand motor-start surges while delivering current-limiting protection for branch circuits in power panels and industrial equipment. Its dual-element construction allows short overloads to pass without nuisance blowing, improving reliability in inductive-load applications, and it carries a 200 kA interrupting rating at 600 V for robust fault clearance. The fuse body measures 2.88 inches in diameter, compatible with standard RK5 fuse holders used in low-voltage distributions. UL-listed as part of the Class RK5 family, the FRS-R-600 provides a balance of fast response to faults with tolerance for startup transients, making it well suited for motor circuits, pumps, conveyors, and other machinery protections in commercial or industrial settings.