An electrical contact unit is provided for a first main member, which has a mainly planar first mounting surface, and for a second main member, which has a mainly planar second mounting surface and is mountable on the first main member. The first mounting surface and the second mounting surface lie against each other when the second main member is mounted on the first main member. The first main member comprises a male contact member, which has an outer surface and carries electrically conductive male contacts, and a maneuvering pin, which extends out from the outer surface. By means of guide elements, the male contact member is mounted in the first main member for motion generally perpendicular to the first mounting surface between an outer position and an inner position. When the male contact member is in the inner position, the outer surface is withdrawn relative to the first mounting surface, the male contacts are in a position of maximum extension, and the manuevering pin is in an innermost position and lies against the second mounting surface. When the second main member is not mounted on the first main member, the male contact emmber assumes the outer position, each male contact assumes the position of maximum extension, and the maneuvering pin assumes the outermost position.