FIELD: electricity.
SUBSTANCE: circuit-breaker includes a parallel branch (4) with coupled vacuum chamber (6) for current switching. The branch does not function in normal conditions, at that current passes through it only when the circuit-breaker (2) starts its breaking action due to increase of current transfer from the main power line (1) to the branch (4). Thus the vacuum switching chamber (6) remains at rest in normal operating conditions.
EFFECT: less demanding requirements to selection of the vacuum chamber dimensions in order to meet strict electric and dielectric requirements for normal operation.
7 cl, 14 dwg
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