Fuse reducers allow a smaller size fuse to be installed in a fuse block intended for a larger fuse. For example: a 30 A fuse is two inches long and will not fit into a 60 A fuse block (which is three inches between clips). A number 263 reducer installed on the fuse permits it to be installed in a 60 A fuse block. Reducers are particularly useful when equipment is being converted. Proper protection can be maintained without the expense of replacing the fuse block. Catalog numbers with the R suffix (number 263-R fit rejection (Class R) fuse blocks. Consult factory for 600 V and Class J reducers.

Bussmann Fuse Reducer, 250 VAC, 60 A Fuse Block, 30 A Fuse, PVC, 3-1/2 in W

• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/Bussmann_NO_263_R_Specification_Sheet.pdf