Abstract: Electrical connectors comprising complementally formed plug and socket elements each of which include safety disks to conceal the contacts the plug and socket elements further having pilot contacts and power contacts as well as mating means arranged to delay the separation of the power contacts and interlock means for the respective elements capable of temporarily immobilizing the plug and power socket elements to provide a power cut-off for electrical engagement of said elements.

Abstract: A connector for connecting two lengths of electric cable, especially of h current capabilities, comprising a male terminal or plug, traversed by a pin, and a female terminal or socket carrying a sleeve freely rotatable thereon but resiliently urged longitudinally toward the end of the socket by a resilient means on the socket. When inserted in the socket, the contacting surfaces on both plug and socket are positively engaged and a rotation of the sleeve further interlocks the pin and sleeve by increasing the resilient load of the resilient means by a slight relative longitudinal displacement of the sleeve resulting from the rotation thereof. This connector ensures a highly efficient electrical contact between the cable ends and eliminates all risk of accidental disconnection.

Abstract: The selective connection device has a safety disc and a complementary disc pivotally mounted on the socket coaxially with the safety disc and displaceable in rotational motion at the same time as the safety disc between the initial position and the final connection position. The complementary disc has a number of openings corresponding to the number of contact locations on the socket and distributed in the same manner. The relative angular position of the socket and of the complementary disc is such that the openings come opposite to the contact locations in the final position.