A foot switch to activate a welding pulse on the Spot Welder.
The switch has a about 1.5m long cable which contains a black, blue and red wire.
So it can be used as a NO (normally open) and NC (normally closed) switch.
To use it with the Spot Welder connect the red and white wire to the Foot Switch connector on the Spot Welder. (red and blue wire on the older batch foot switches)
This way the switch works in the NO (normally open) configuration.
If you need it to work as a NC (normally closed) switch use the black and white wire. (black and blue wire on older batch foot switches)
The switch is rated up to 250V AC and 10A current.
But i would not recommend to use it for more than 3A current.