isolator section (circuit breaker) comprising a two-open tires with contact surfaces at the ends and the conductive body, closing the tires on their contact surfaces with the rotary mechanism and the clamping device, characterized in that the section is provided with arcing chambers and the mechanism of acceleration response, and the ends of the tire arranged overlapped, with their contact surfaces lie in the same plane, and conductive bodies are formed as round rollers mounted in the rotary mechanism with the possibility of roll on said contact surfaces and slide down them, wherein the clamping devices are formed as spring loaded balls.
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