| 摘要 |
An electromagnetic operation mechanism is constituted by a fixed core, a movable core, a permanent magnet, a drive shaft connected to the movable core, an electromagnetic coil for moving the movable core forward and backward, a movable shaft for a vacuum valve, and a link mechanism for coupling the movable shaft with the drive shaft. The movable core is provided with a movable adsorbing part, which in conjunction with the electromagnetic coil, maintains the movable contact in a closed state; the fixed core has a lever-shaped manual-open link mechanism wherein an abutting part which abuts the movable adsorbing part is formed at one end and a manual operation part is formed at the other end. The manual-open link mechanism is used to separate the movable adsorbing part from the permanent magnet with the contact part so as to manually open both contacts. |
