SY2S-05C - 

SY Series DIN Rail Snap Mount Socket
Snap-mount sockets are designed to mount on BNDN-1000 mounting rail. The built-in mounting clip eliminates mounting hardware and reduces mounting time by eighty percent. For spacing between adjoining sockets, use SA-406 DIN rail spacer. Spacers : 0.197" in width. Spacing can be adjusted according to the amount of spacers added. To prevent sideward movement, use BNL-5 end clip at each end of socket row.To Mount: Place socket on mounting rail and press down.To Remove: Pull clip out with screwdriver and lift socket.

Mating Relay Series: RY2S and RY22S

Hold Down Spring: SY2S-02F1

Hold Down Clip: SFA-101 (top notch), SFA-202 (side notch)
The terminals of the socket is M3 screws with captive wire clamp termination.