Abstract: The present invention provides an electrical junction box suitable for connection, for example, to a wire harness in a vehicle such as an automobile. The box is adapted to provide electrical connection to a plurality of electrical connectors, a plurality of fuses and a plurality of relays, the box having a casing, a connector circuit having a plurality of first bus bars, a fuse circuit discrete from the connector circuit and having a plurality of second bus bars and a relay circuit discrete from the connector circuit and having a plurality of third bus bars. At least one of the second and at least one of the third bus bars are welded to respective ones of the first bus bars at welding portions which are received in a protection structure which presses them towards each other. The protection structure clamps the joined welding portions so that the risk of disconnection of the welded connection is reduced or avoided.

Abstract: An electrical junction box for a vehicle provides electrical connection to electrical connectors, fuses and relays. Upper and lower case parts of a casing contain a base circuit, a fuse circuit and a relay circuit. The base circuit has first bus bars and insulation layers stacked together. The first bus bars connect to electrical connectors in use. The fuse circuit has a substrate which is discrete from the base circuit, and second bus bars providing connection to fuses in use. The relay circuit has a substrate, which is discrete from said base circuit, and third bus bars providing connection to relays in use. The second bus bars and the third bus bars are joined to the first bus bars by welding. A compact construction which is easily modified is obtained.

Abstract: An electrical connection construction for connecting conductive members of an internal circuit of an electrical connection box and wires of a wiring harness, in which the wires of the wiring harness are inserted into the electrical connection box through openings formed on the electrical connection box such that conductors of the wires of the wiring harness are connected to the conductive members of the internal circuit of the electrical connection box, respectively by a joining member.