Plug-in socket system

A plug-in socket system for one or more rail-mounted devices for detachable fastening to an electrically conductive mounting rail acting as a protective conductor, comprising:

• an electrically insulating busbar component for receiving current-carrying busbars;
• an electrically insulating protective part detachably mounted on the busbar component and comprising an exterior surface, an interior surface, and a plurality of access slots with protection against direct access;
• wherein the plurality of access slots is configured and arranged to be detachably mounted on one or more rail-mounted devices on the exterior surface;
• and wherein the plurality of access slots is configured and arranged to allow one or more electrical contacts of the one or more rail-mounted devices to provide an electrical contact with the one or more busbars;
• wherein the one or more rail-mounted devices comprise one or more locking protrusions;
• wherein the busbar component comprises one or more interlocks configured and arranged adjacent to the access slots to mechanically lock the one or more rail-mounted devices after attachment such that the one or more locking protrusions of the rail-mounted device are passed through the protective part and the protective part is also mechanically locked to the busbar component;
• at least one protective conductor terminal, which is designed and can be arranged on the busbar component in such a way that it provides electrical grounding for the one or more rail-mounted devices of the mounting rail acting as protective conductor.