An electrical switch is disclosed for switching an electric current between a feed and an outgoer. The electrical switch can be mounted in a switchgear assembly and as a result electrical contact can be made with the electrical switch by a feed and an outgoer of the switchgear assembly. In one embodiment, the electrical switch includes an internal voltage tap for supplying power to a switch-internal electronics system and a changeover switch. The changeover switch adjusts the electrical connection between the feed or the outgoer and the internal voltage tap.