The invention relates to an electric socket outlet, in particular an electric socket outlet adapter (11) comprising a housing (13), a socket zone that is located on the housing (13) and includes a first socket (15) and a second socket (17) for accommodating plugs of a first standard and a second standard, the first and second sockets being provided with first and second plug holes. The socket outlet (11) also comprises a first movable protective element (19) which can cover the first plug holes as well as a second movable protective element (21) which can cover the second plug holes. In the closed position, the first or the second protective element (19, 21) is mechanically locked when the other protective element (19, 21) is in the open position.