VACUUM INTERRUPTER, VACUUM CIRCUIT BREAKER, AND VACUUM CONTACTOR

1 . A vacuum interrupter comprising:

a vacuum insulation container;

a fixed side contact provided in the vacuum insulation container; and

a movable side contact provided in the vacuum insulation container and configured to contact and separate from the fixed side contact, wherein

a first contact surface of the movable side contact configured to contact the fixed side contact is planar, and

a second contact surface of the fixed side contact configured to contact the movable side contact is spherical protruding toward the movable side contact.

2 . The vacuum interrupter according to claim 1 , wherein the fixed side contact and the movable side contact are made of a composite material containing tungsten carbide (WC), cobalt (Co), and silver (Ag).

3 . The vacuum interrupter according to claim 1 , wherein the first contact surface is planar with a flatness of 0.1 mm or less.

4 . The vacuum interrupter according to claim 1 , wherein the first contact surface has a counterbore at a center.

5 . The vacuum interrupter according to claim 1 , wherein the second contact surface has a radius of curvature equal to or greater than a length of a movable side electrode in a movable direction, the movable side electrode to which the movable side contact is attached.

6 . A vacuum circuit breaker, comprising:

the vacuum interrupter according to claim 1 .

7 . A vacuum contactor, comprising:

the vacuum interrupter according to claim 1 .