Designed for industrial, medical, and aerospace/avionics applications, the Model 54 0.5-inch panel control extends the Model 51/53 Series by adding a DPDT push-pull switch module while the Model 56 ...
As you can see in the schematic the 12V battery (or use other voltages) is connected with the plus at terminal T1 and minus at terminal T2. The contact 1 and 4 are connected together as 2 and 3 are ...