| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a fluid-pressure drive device of a circuit breaker and to improve reliability thereof. SOLUTION: This fluid-pressure drive device 3 of a circuit breaker has: a fluid-pressure cylinder 4 for switching a contact 2; an opening control valve 20 for operationally opening the fluid-pressure cylinder; a closing control valve 40 for operationally closing it; and solenoids 60 and 80 installed in the respective control valves for driving the control valves, respectively. The solenoids have plungers 32 and 52. In the opening operation and in the closing operation, the operation starting times of the opening control valve and the closing control valve are made different from each other. COPYRIGHT: (C)2004,JPO&NCIPI
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