I bought this switch to put on my dirt bike for added theft protection and so other people wouldn't be able to start my bike when I'm not around. I also didn't like holding down the momentary kill switch until the engine stopped. I bought the switch not thinking about if it is normally open or normally closed. Like most switches when it is in the off position the circuit is open. When a dirt bike is killed the spark plug is essentially shorted out or "closed." So basically the switch works the opposite of what I needed but after opening the bottom of the switch i realized the wires could be easily re-soldered to the other contacts, in the switch, to flip the switch's fiunction. So after slight modification the switch works great for my application and has a quality feel to it.