A socket has a plug board with first plug-in openings for appropriate pins of a plug of a first standard and with second plug-in openings for appropriate pins of a plug of a second standard. Provided in a spacing to the plug board are a first type of contact mounts for receiving plug pins of the first standard, and a second type of contact mounts for receiving plug pins of the second standard. Provided between the contact mounts and the plug board are protection elements which are movable out of a closed position in which the first and second plug-in openings are blocked, into an open position in which the plug-in openings are open. The protection elements are pretensioned into their respective closed positions by spring elements. The first and second protection elements are pretensioned into their respective end positions in different directions of movement by the spring elements.