Abstract: An electrical system includes plug fuse set (20) or fuse unit (20a) (20b), fuse connector (22) (22a) (22b) (22c) (22d), circuit connector (23) (23a) (23b) (23c) and cabling (41). Each fuse element is made up of at least a circuit electrode (25), a bus electrode (26) and a fuse link (43) positioned within a void (42) within an enclosure (24) (24a). The bus connector, also known as the fuse connector, has pairs of bus electrode(s) (34) (34a) flanked by a pair of slots (29), each of which is adapted for insertion of a pair of the circuit connectors to interlock the bus connector and the circuit connector. The bus connector can be directly connected to battery cable(s) (85). The circuit connector(s) have electrodes (39) which connect to bus electrode(s) and fuse electrodes. Each circuit connector also is attachable to circuit cabling (40).