S3B + S3BC Relay Socket, DIN Rail, Screw, 11 Pins, 10 A, 300 V. The S3B + S3BC is a 11-pin Relay Socket with one level terminal. Suitable for C3 relays. This DIN rail or panel mountable socket features integrated clip and marking label accepts the exclusive Releco coding ring for coding both the relay and base. The coding ring can be used to code a specific relay to fit a specific socket up to 11 combinations.