Abstract: An electrical junction box includes a plurality of relays, a relay carrier, and a lead frame including connecting sections. Each relay includes electrical connection pins enabling the relay to be plugged into the relay carrier, thereby enabling electrical connection to the lead frame. Each relay includes a communication bus interface that is connected to a control pin of the relay. The lead frame includes a section forming a communication bus. The control pins of the relays are electrically connected to the section forming the communication bus when the relays are plugged into the relay carrier.

Abstract: The invention relates to a process for manufacturing a power circuit board in which, on the one hand, a printed circuit board including an insulating substrate and a conductive track on one of the sides of the substrate, and on the other hand, a bus bar element, are provided. The bus bar element is welded to the conductive track using a laser. In order to make it possible to produce the weld by laser welding, even with a relatively thick bus bar, the welding is carried out in a zone that is thinner relative to the maximum thickness of the bus bar. Thus, a printed circuit board is obtained with a bus bar having a thick zone for conducting high currents and a thinner zone in order to allow the bus bar to be welded to the conductive track by laser welding.