Described as a versatile surface-mount alternative to shunts, the ERG SMJS switch sits on a 0.05" center and can be configured as either a SPDT or DPDT switch. Via a custom or ganged top half, the ...
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 ...