This subbase electrical module mounts quickly and easily in the subbase and may be connected to a receptacle outlet module  or hardwire module(sold separately). The Subbase Fuse Module provides in-line over-current protection at the unit when required by NEC (National Electric Code) or local codes. They  can be used for 208/230 or 265-volt installations. The fuse module provides single over-current protection for one power leg.  Two fuse modules must be used  for over-current protection for both legs. The module contains electrical junction box, 15-amp fuse holder, 15-amp cartridge fuse and cover plate.