8501NR plug in relay sockets are designed for the proper wiring of 8501R plug in relays. This socket can be mount on 35mm DIN rail or can be mounted directly to a panel. The 8501RS42 or 8501RSD42 relay will plug into this relay socket which is designed for 8 blade pins. The socket terminals have pressure wire clamps for a good secure connection. To save panel space this socket has stacked terminals. 8501NR plug in relay sockets are UL component recognized and CSA certified.