The invention concerns a plug connector for a high current device, intended to be placed in particular in the engine compartment of a motor vehicle. A device such as a printed circuit board housed in the plug connector is connected to a cable via at least one rigid conductive metal bar (bus bar). A ring is interposed between the rigid conductive metal bar and a terminal electrically connected to the cable. A bolt holds the terminal, the ring and the bus bar clamped together. To ensure the seal of the plug connector at the bolt, a first ring seal is placed between the ring and an unthreaded zone of the shank of the bolt, and a second seal is placed between the ring and the plug connector.