FIELD: circuit-opening devices fitted with movable contact. SUBSTANCE: device has mechanical energy storage spring, spring reset mechanism incorporating electric drive for actuating first revolving part, turning lever, second revolving part, and interlocking facilities engageable with second revolving part for setting device in two stable positions. Turning lever has first pin engageable with two supporting surfaces of first revolving part and second pin engageable with two supporting surfaces of second revolving part. Device provides for two stable interlocking points spaced 180 deg, apart. EFFECT: enhanced speed of response. 7 cl, 4 dwg
