A6K45R is a Mersen Class RK1 fast-acting current-limiting fuse; the primary electrical envelope is 45A, 600VAC / 300VDC, suited to high-fault-current feeder and backup protection in a cartridge / clip format.
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A6K45R is specified as a Mersen Class RK1 fast-acting current-limiting fuse for high-fault-current feeder and backup protection. Electrical and mechanical selection centers on 45A, 600VAC / 300VDC, Class RK1 current-limiting protection with a 200kA AC interrupting rating, and the cartridge / clip format. Confirm installation details and coordination against the official Mersen datasheet before placing it into a design.
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