FIELD: electrical engineering. SUBSTANCE: device has power contacts 1, 2, auxiliary contacts 5, 6 of which one has nozzle 9, insulating nozzle 10 with cylindrical insulating piece 11, and cylindrical bushing 8 on auxiliary-contact holder 7; inner surface of nozzle insulating piece and outer surface of cylindrical bushing form specified clearance or slit of sectional area Ssl. Cylindrical bushing on arcing-contact holder has axial through holes Sc of total sectional area Sc; during capacitive current disconnection the following relationship is ensured: 0,2Sin<Sc+Ssl<0,5Sin, where Sin is sectional area of insulating nozzle during operating period of switch. EFFECT: improved design and operating reliability of arc-control device. 1 dwg
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