Patent ID: 8642912

Claim:
A vacuum circuit breaker, comprising: a driving unit configured to generate a driving force necessary to perform a breaking operation; a frame unit horizontally coupled to the driving unit and configured to transfer the driving force of the driving unit; and a plurality of main circuit units vertically coupled to the frame unit each having a vacuum interrupter for performing a breaking operation by receiving the driving force from the frame unit, wherein the driving unit comprises: a rotation shaft configured to transfer a rotational force of a motor; a connection member having one end eccentrically coupled to the rotation shaft; and a conversion link coupled to another end of the connection member and configured to convert a rotary motion of the rotation shaft into a linear motion, wherein the frame unit comprises: a transfer link coupled to the conversion link and configured to perform a horizontal linear motion in a direction according to a direction of rotation of the rotation shaft; and a plurality of direction conversion links coupled to the transfer link and configured to convert the horizontal linear motion of the transfer link into a vertical linear motion; wherein each of the plurality of main circuit units comprises: a housing configured to accommodate the vacuum interrupter therein; a first conductor mechanically coupled to the vacuum interrupter such that the first conductor is electrically connected to the vacuum interrupter; and an insulation rod having one end coupled to the vacuum interrupter and the other end coupled to a direction conversion link of the frame unit, the insulation rod configured to operate the vacuum interrupter by a driving force transferred through the direction conversion link of the frame unit, and wherein the frame unit and the driving unit are coupled to each other at a position where a distance from one side surface of the frame unit to one side surface of the driving unit is equal to a distance from another side surface of the frame unit to another side surface of the driving unit.