Abstract: An adapter with incorporated components of a power supply for connection to a conventional power outlet, includes a casing having one end face which is formed with prongs for insertion into the power outlet. The casing accommodates contact sleeves which are in direct electric connection with the prongs and is formed with a socket-forming cavity for attachment of a plug. The socket has a bottom which is provided with bores in alignment with the contact sockets so as to form a continuous connection from the power outlet to the contact sleeves. The casing is further equipped with at least one additional terminal which is linked to a power supply or at least to components of the power supply.