40 Amp 600 VAC JDL Class J, 300,000 AIR ac (Self Certified), Dual-Element,Time-Delay Fuse

On older systems available short-circuit current may exceed the interrupting capacity of the circuit breakers, fuses can be installed in series with existing equipment. Well suited for lighting and heating circuits and other non-inductive loads. Provides component short-circuit protection in compliance with NEC® 110-10, where protection devices shall clear a fault without “extensive damage” to the circuit components. High interrupting rating helps meet the requirements of future system expansion and the increases in available utility short-circuit current.