| 摘要 |
PROBLEM TO BE SOLVED: To provide a puffer type gas-blast circuit breaker, operating with low operating force and exerting proper shut-off performance, not only in the case of small current of several hundred amperes but also in the case of a large current of tens of thousands of amperes. SOLUTION: The puffer type gas-blast circuit breaker has a stationary arc contact, a movable arc contact brought into contact with/separated from the stationary arc contact, a first piston installed on the side of the movable arc contact and reciprocating relative to a first cylinder within the cylinder, a second piston coupled to the movable arc contact and reciprocating relative to a second cylinder within the cylinder, a hole for the first cylinder, which is formed in the first cylinder and enables the effluence of arc-extinguishing bas blown upon an arc generating part for generating an arc when the stationary arc contacts are opened and separated from each other, and a communication passage for allowing the arc generating part to communicating with the inside of the second cylinder. The circuit breaker is provided characteristically with a pressure response valve for opening/closing the communication passage, according to the gas pressure of the arc-generating part.
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