Plug-in socket for narrow interface relays RSL with coil voltages of 60 V. Control voltages of 110 VAC/DC can be connected, which are adapted to the coil voltage of 60 V. The plug-in socket features an LED to indicate the control status, a lever for easy removal of the relay, and a protection module. The wiring connections are made via spring-loaded terminals. Additionally, busbars can be connected.