Vacuum circuit breaker

The invention discloses a vacuum circuit breaker, which belongs to the field of circuit breakers and comprises a bottom plate, a vacuum arc-extinguishing chamber and other parts are arranged on the bottom plate, a protective shell covers the bottom plate, a wire inlet hole and a wire outlet hole are formed in the top surface of the protective shell, and a connecting assembly fixedly connected with the protective shell is arranged on the bottom plate. An installation opening is formed in the side wall of the protection shell, an exhaust fan is installed in the installation opening, a control assembly used for controlling starting and stopping of the exhaust fan is arranged on the protection shell, a protection cover is installed on the side wall of the protection shell and located on the outer side of the exhaust fan, and a plurality of exhaust holes are formed in the protection cover. The exhaust fan is provided with a dust removal mechanism used for cleaning the exhaust holes. The vacuum circuit breaker has