Patent ID: 7098418

Claim:
A vacuum circuit breaker comprising: a vacuum interrupter; a shaft disposed such that a central axis thereof is perpendicular to a closing and opening direction of a contact of said vacuum interrupter; a lever fixed to said shaft so as to be perpendicular to said shaft; an electrically-insulating rod coupled to a first end of said lever, said electrically-insulating rod moving in said closing and opening direction of said contact interdependently with rotation of said shaft to close and open said contact of said vacuum interrupter; and an operating mechanism portion for closing and opening said contact of said vacuum interrupter by driving said shaft so as to rotate when a circuit making command or breaking command is received, wherein: said vacuum circuit breaker further comprises: an adjusting rod disposed rotatably; an internal thread member into which said adjusting rod is screwed, said internal thread member converting rotational motion of said adjusting rod into rectilinear motion; and a power-bearing member for transmitting said rectilinear motion converted by said internal thread member to said shaft to rotate said shaft; whereby said shaft can be rotated to move said contact from an open state to a closed state by rotating said adjusting rod.