The Ferraz Shawmut A4J 20 A Class J fast-acting fuse delivers precise, high-speed overcurrent protection for demanding industrial and commercial applications. Rated at 600 V with a short-circuit current rating (SCCR) of 200 kA AC / 100 kA DC, this fuse provides exceptional fault clearing capacity in a compact 57.2 × 20.7 mm form factor. Whether you're protecting variable frequency drives, control panels, or sensitive electronic equipment on the job site, the A4J series offers the reliability and code compliance contractors count on — backed by both CSA and UL approvals for Canadian and North American installations.

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