Dual Element Time Delay Cartridge Fuse 20 Amp Bulk Class RK5. Ferrule type cartridge. Provides motor overload, ground fault and short-circuit protection. Helps protect motors against burnout from overloads and single phasing on three phase systems. Will hold an overload which is five times greater than the ampere rating of the fuse for a minimum of ten seconds. Fusetron (tm) green fuses are 23% more energy efficient and offer the best time-delay performance. 250 volt maximum AC. 125 Volts DC. UL Listed, CSA Certified.