4-pole socket and plug blocks
P4/50...
 
The socket and plug blocks are made for slide-in rack systems. Sockets and plugs are made of brass, silver-plated. The sockets are fitted with the proven MC-Multilams. The sockets and plugs have screw clamping terminals. Poles are marked with L1, L2, L3 and N. The plug of pole N is leading.