Bussmann FRN-R-70a Fusetron RK5 Dual Element TD

FRN-R-70a Fusetron RK5 Dual Element TD from Eaton's Bussmann series is a 70 amp, current-limiting, time-delay cartridge fuse designed for Class RK5 fuse blocks. Its dual-element design tolerates brief startup surges common to motors and transformers while delivering dependable overcurrent protection; it is rated for 250 VAC and 125 VDC with an interrupting rating of 200 kA at 250 VAC and 20 kA at the DC rating, making it suitable for feeders and panel circuits in industrial environments. The FRN-R-70a features a fiberglass cartridge body and standard RK5 form factor, measuring approximately 1.06 inches in diameter and 5.88 inches long, and it uses knife-blade terminals for simple, secure mounting in holder-style assemblies. As part of the Fusetron FRN-R family, this fuse merges current-limiting performance with time-delay behavior to accommodate transient overloads without nuisance trips, while isolating faults quickly under sustained faults. This specific 70 A variant is commonly used in applications such as motor drives, HVAC equipment, transformers, and other power-distribution circuits where reliable protection against short circuits and overloads is required, especially in systems with higher inrush currents. With RK5 compatibility and Bussmann’s long-standing protection heritage, FRN-R-70a offers a compact, robust protection solution for industrial electrical panels and equipment that demand dependable time-delay protection at medium-to-high current levels.