Cooper Bussmann SC-20 Specialty Class G Rejection Type SC Time Delay Cartridge Fuse 20 Amp
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They have a minimum 300 V rating and are available up to 60 A. All SC fuses are 13/32 in Dia with varying lengths to provide a rejection feature that helps prevent over fusing (installing a 30 A fuse in a 20 A circuit). One half to 6 A SC fuses are fast-acting, while 7 to 60 A SC fuses are time-delay to permit temporary overloads to pass without nuisance openings. High interrupting rating, current limiting. Rated at 277/480, 120/208 and 120/240 volt. UL Listed 100,000 AIR, RMS symmetrical AC (Glass G). Glass tube, nickel-plated brass endcaps.