Breakout board for 1x RJ45 connector.
This board is mounted inside a wall switch box and can be connected to up to 3 switches. Pin 1 supplies the voltage, usually 24VDC, and pins 2 through 4 return the contacts status to an automation system. The image below illustrates how the connections are made.
Also check here the board that connects the other end of the cables inside the automation cabinet.
