Cooper Bussmann 663-R Fuse Reducer Kit is a 3-pack of No.663-R fuse reducers that downgrades from a 60 A Class R fuse block to a 30 A fuse, rated up to 600 V. Each reducer is a single-unit device (no pairing required) compatible with Bussmann Class R protection. The kit provides flexible protection for circuits that require smaller fuses while fitting into the same fuse holder footprint. Use cases include industrial control panels and power distribution setups where downsizing from 60 A to 30 A fuses is needed without changing the existing fuse block.
