The invention relates to an electrical plug connection, preferably a circular plug connection having a first circular plug connector and a fastening ring. The fastening ring is rotatably arranged on the first circular plug connector. Furthermore a second circular plug connector, a primary lock and a secondary lock having a locking ring that can be placed onto the second circular plug connector are provided. The secondary lock is formed by the fastening ring and the locking ring being in locking engagement when the first circular plug connector and the second circular plug connector form the plug connection.