In connection with a plasma arc metal cutting apparatus, an electrode having vertical movement within a nozzle, said nozzle having a gas supply passing therethrough, an over-center spring mechanism holding the electrode in one operating position, a switch in one position energizing the electrode in engagement with the nozzle and said switch in a second position actuating the spring mechanism to snap the electrode to a position away from engagement with the nozzle and thus draw an arc between the electrode and the nozzle, the arc comprising a plasma flame to cut materials.