A plug is connectable to an electrical socket which has concentric ring shaped openings housing electrical contacts. The plug has a body supporting electrically conductive concentric rings insertable into the socket to contact the electrical contacts to form electrical connections. A hollow post extends away from the plug body and has a transverse aperture therethrough. A rod with a narrowed portion is slideable within the post. A spring biases the rod towards a latched position in which the narrow portion is not adjacent to the transverse aperture. A cross-brace is connected to a portion of the rod which extends outside of the post. Pins engage the cross brace and can be pushed to move the brace, and thereby push the rod to position the narrowed portion to an unlatched position adjacent the aperture to enable removal of the plug.