I'ts going to be for a wireless rocket launcher for model rockets. The safety switch would be to arm the launcher and would have to be toggled on manually. But I would like the arduino to be able to toggle it off after a timeout or if it detects that there is no continuity on the ignition circuit.
I can make a logical safety switch with a momentary press button, but it would be nice to have some kind of mechanical switch that physically disconnects the ignition circuit while the system is not armed.