3-way master socket with label field for channel installation CYB-PS aluminum effect. All CYB sockets have increased contact protection. The master and slave sockets are installed without a socket. This system consists of a triple master socket that can be expanded with any number of double slave sockets. The combination is completed with an end piece that is simply inserted between the side of the socket and the front cover. Labeling, termination and strain relief are carried out on the master socket.