FRN-R-25 is a Bussmann/Fusetron Class RK5 fuse rated for 25 A at 250 V AC (and 125 V DC), built with a dual-element, time-delay design that provides current-limiting protection for circuits with inrush loads. It is non-indicating with ferrule-end connections and carries an interrupting rating of 200 kAIC at 250 VAC and 20 kAIC at 125 VDC. As part of the UL Class RK5 family, FRN-R fuses are marketed for energy-efficient protection in branch circuits, with manufacturer literature noting about 23% energy savings versus older designs.
