An electrical device includes a connection part and a cover part connected to the connection part. A mounting part is accommodated and situated in the connection part, and a first circuit board is connected to the mounting part in a coded manner. A second circuit board is situated in the cover part, which is connected to a frame part in a coded manner. The first circuit board is connected to a plug connector part, and the second circuit board is connected to a mating plug connector part. A leading guide for a plug connection is provided on the mounting part, which becomes active when the cover part is connected to the connection part. The frame part being able to be connected to the mounting part in a coded manner.