OT50 is a Mersen Class K5 fast-acting one-time fuse; electrical selection centers on 50A and 250VAC / 250VDC, suited to feeder, branch-circuit and resistive-load protection in a cartridge / clip format.
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OT50 is specified as a Mersen Class K5 fast-acting one-time fuse for feeder, branch-circuit and resistive-load protection. For coordination, the page records 50A, 250VAC / 250VDC, Class K5 fast-acting protection with a 50kA interrupting rating, plus the cartridge / clip connection style. Confirm installation details and coordination against the official Mersen datasheet before placing it into a design.
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