FIELD: high-voltage circuit-opening devices. SUBSTANCE: pufferbreaker arc-control device has fixed power contact and movable contacts, auxiliary contacts of which one has nozzle, insulating nozzle, and L-shaped cylindrical insulating bushing that confines active oscillation and communicates with compression chamber space above piston through duct formed by inner cylindrical surface of insulating nozzle and outer cylindrical surface of L-shaped cylindrical bushing. Optimal parameters are chosen for insulating nozzle, L-shaped cylindrical bushing, and duct between them. EFFECT: enhanced operating reliability. 1 cl, 1 dwg
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