| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a fluid pressure driving device for a circuit breaker which reduces cost and improves reliability by suppressing pressure increase during buffering in simple configuration.SOLUTION: The fluid pressure driving device comprises: a contact 2 formed from a movable contactor 2b and a stationary contactor 2a; a rod 3 connected to the movable contactor 2b; a piston 10 which is connected to the rod 3 and installed so as to slide within a cylinder and opens/closes the contact 2; a fluid pressure source 5 which pressurizes and supplies a working fluid; and a control valve for driving the piston 10. The piston 10 separates a supply pressure chamber 12i and a small pressure receiving area chamber 9 communicating to the fluid pressure source 5 at a side connected with the movable contactor 2b from a cylinder control chamber 17 at a side opposite to the side connected with the movable contactor 2b. The control valve controls supply/discharge of the working fluid to/from the cylinder control chamber 17.</p> |
