| 摘要 |
PURPOSE: An apparatus for driving fluid pressure of a circuit breaker is provided to prevent a pumping operation repeating a switching process of a contactor, to cheaply buy a small anti-pumping apparatus, and to easily equip a piston of the anti-pumping apparatus. CONSTITUTION: An apparatus for driving fluid pressure of a circuit breaker comprises a piston(5) for switching contactors(1,2) and a control valve apparatus for operating the piston(5). The control valve apparatus has a conversion valve(13) and a conversion control valve(13). The conversion valve is an apparatus for driving fluid pressure of a circuit breaker, having a conversion control valve(39) for closing and a conversion control valve(37) for opening. An anti-pumping piston(42) is equipped to close a check valve(41), and connects an inner part of a duct line, which is connected on a restoring side of fluid between a second side of the conversion control valve(39) and a first side of the check valve(41), to an operating system(44) of the anti-pumping piston.
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