| 摘要 |
Disclosed is a vacuum bulb having a pair of electrodes which are detachably stored in a vacuum container, wherein a movable electrode (1) is comprised of an outer peripheral coil electrode (3) and an inner peripheral coil electrode (4), which are coaxially arranged, and are respectively divided by slits (3b), (4b). The outer peripheral coil electrode (3) and the inner peripheral coil electrode (4) are respectively connected to spoke portions (3c), (4c), each of which extends in radial directions from a cup-shaped bottom portion toward the outer periphery. The outer peripheral coil electrode (3) and the inner peripheral coil electrode (4) respectively have coil portions (3d), (4d), in which an arciform conducting path is formed in the circumferential direction. One end of the outer peripheral coil electrode (3) and the inner peripheral coil electrode (4) is connected to an electrode rod (5) which discharges electric current to the outside of the vacuum container, and the other end is connected to a contact point (2), so that a magnetic field occurring when the contact point (2) is detached is equalized, and the arc is dispersed. Thus, the interruption performance is improved. |
