Mersen positions A4J20 as a Class J fast-acting current-limiting fuse, carrying 20A with a 600VAC / 300VDC system rating, suited to feeders, panelboards and general high-fault-current circuits in a cartridge / clip format.
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A4J20 is a A4J product from Mersen, built as a Class J fast-acting current-limiting fuse for feeders, panelboards and general high-fault-current circuits. 20A and 600VAC / 300VDC define the primary electrical envelope, while Class J current limitation with 200kA AC and 100kA DC interrupting ratings and cartridge / clip describe protection and fit. Confirm installation details and coordination against the official Mersen datasheet before design release.
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