Bussmann FRS-R-20 Fusetron Time-Delay Current Limiting RK5 Fuse

FRS-R-20 Fusetron Time-Delay Current Limiting RK5 Fuse is a 20 A, 600 V class fuse from Bussmann (Eaton) designed for branch-circuit protection in 600 V systems. This dual-element, time-delay device is rated for 600 VAC and 300 VDC, providing reliable protection by interrupting high-energy faults while tolerating brief overloads. It features ferrule-end terminations on a cylindrical RK5 body and is non-indicating, aligning with other FRS-R ratings. The FRS-R family spans 1/10 A to 60 A, and the FRS-R-20 delivers an interrupting rating up to 200 kAIC at 600 V. This model is part of Eaton’s Bussmann series, a common choice for protection in power distribution and equipment circuits requiring reliable current-limiting behavior.