| 摘要 |
<p>Provided is a direct current circuit breaker which comprises a fixed terminal (42), a movable contact (44), a shaft (46), a sealing container (40), a contact pressure spring (410), a return spring (411), an operation handle (1), a shaft pressing piece (56), and an electromagnetic removing block (6). To the fixed terminal (42), a fixed contact point (42a) is provided. To the movable contact (44), a movable contact point (45) is provided. The shaft (46) is inserted through the movable contact. The sealing container (40) holds the fixed terminal and stores the movable contact and the shaft in a hermetically sealed state. The contact pressure spring (410) gives a contact pressure between the movable contact point and the fixed contact point. The return spring (411) biases the shaft in a direction away from the fixed contact point. The shaft pressing piece (56) presses one end of a main body of the shaft based on an operation with the operation handle, thereby causing the shaft to approach the fixed contact point. The electromagnetic removing block (6) removes a pressing means from the end of the main body of the shaft in the case where an abnormal current flows through the movable contact point and the fixed contact point that are closed, thereby opening the movable contact point and the fixed contact point.</p> |
