Start switches are actually just simple switches for switching on a machine, e.g. an electric vehicle, but as a key switch they are protected against unauthorised operation (except for special variants with a rotary knob). They usually only have to switch between OFF and ON, in the case of start switches with two positions they can switch between OFF, ON1 and ON2. The key can usually be removed in the OFF position. Start switches are classically used in electric vehicles that do not require a starter motor.