FIELD: electrical engineering. SUBSTANCE: method involves anticipatory current taking off mechanical contacts by parallel connection of charged polar capacitor cumulatively with current direction accompanied by reduction in contact current and partial discharge of capacitor. As soon as contact current is brought to value required for arcless switching of threshold level, contacts open and at the same time transistor changes over capacitor in direction opposing current flow which causes supply current drop to zero and recharge of damping capacitor to initial level. EFFECT: enhanced service period. 2 cl, 2 dwg
