In spite of the absence of a pullout fuse block, functional elements comprising simple socket-type connectors come into contact with an external cable in a mechanically and electrically reliable manner, when said cable has a rod-type or sword-type mating connector which engages directly in the connector by means of a radially protruding return baffle, in a sealed manner, through the rear of an opening in the wall of a housing. If, during the plug-in action, an injection-molded skin which first at least partially closes the opening is enlarged or perforated, the breaking edge nestling against the envelope surface of the mating connector in the plug-in direction provides another retraction block with additional sealing and vibration damping.