I wonder if anyone has any ideas, I am trying to use a microcontroller to stop a small 4-stroke engine. My plan was to use a relay and tap into the motors kill switch, when it is time for the motor to stop using a ground coming from the motor the relay will energize and short out the motor coil and stop the engine, which is the exact principal of any small engine kill witch. I measured the current when the short occurs at 800 mA which is fine they only problem is that I read online that some CDI voltages go as high as 30000 volts. What would be the best way to switch such a high voltage? I assume the amperage will always be lower than 1 A, do they make relays that can handle such high voltages, or even a triacs.

Any ideas would be appreciated.