High voltage vacuum circuit breakers have been widely used in circuit systems due to their small size and light weight. However, it still needs to undergo regular maintenance to make good use of its performance and ensure its normal service life. In more common power distribution systems, pipes are generally used for inspection of fracture withstand voltage. The inspection purpose of this step is mainly to test the vacuum value of the high-voltage vacuum circuit breaker . After the test is performed, it is recorded in the book for subsequent maintenance and observation. In addition to the withstand voltage test, some insulation of high voltage vacuum circuit breakers also need to be tested. These are all necessary to ensure that the high-voltage vacuum circuit breaker can be used normally in the circuit system. If unqualified or damaged components are found, they need to be replaced immediately. In addition to the ordinary circuit system, in some large current circuits, the resistance of the high-voltage vacuum circuit breaker must be checked to ensure the normal operation of the high-voltage vacuum circuit breaker.