CONTACT POINT MONITORING DEVICE FOR VACUUM CIRCUIT BREAKER, AND VACUUM CIRCUIT BREAKER COMPRISING SAME

摘要

The present invention provides a contact point monitoring device for a vacuum circuit breaker comprising: a fixed electrode which is fixed in an insulated container; a fixed contact point which is disposed at one end of the fixed electrode; a movable electrode which is installed in the insulated container and is movable in the upward or downward direction; a vacuum interrupter which is disposed at one end of the movable electrode and includes a movable contact point coming into contact with or separated from the fixed contact point; and a pushrod assembly which is coupled to the other end of the movable electrode and allows the movable electrode to move upwards or downwards. The contact point monitoring device comprises: a differentiation sticker which is attached to the outer circumferential surface of a cylindrical rod housing of the pushrod assembly; and a sensor assembly which is adjacent to the pushrod assembly, monitors the position of the differentiation sticker, and has a different sensing direction to the movement displacement of the pushrod assembly.