Use a regular relay or contactor. Energize coil with 2 momentary
contact switches, one a normally open (Start) and the other a normally
closed (Stop), in series. One end of switches in series to AC hot
(Black wire) and other end of series switches to switched output of
relay or contactor. Add appropriate resistor in line to avoid burning
out coil in case it's not the voltage you're switching.

-- Teri