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VSG type indoor high voltage vacuum circuit breaker (hereinafter referred to as circuit breaker) is an indoor switchgear used in 12kV power system, as a protection and control unit for power grid equipment and power design of industrial and mining enterprises. It is suitable for switching a variety of unused loads, frequent operation, and multiple breaking short-circuit currents. The product adopts a new circuit breaker operating mechanism, and the VSG primary part can adopt foreign brand solid-sealed poles, and the vacuum arc extinguishing type and the leading electrical circuit parts are solidly sealed into a whole to protect the arc extinguishing chamber from collision, dust and condensation. Strong environmental adaptability, greatly reducing the cost of operation and maintenance, and truly realizing the partial maintenance of the product at one time. Less maintenance of the operating mechanism; The integrated design of the operating mechanism and the circuit breaker body has been verified by type test, and has E2 level electrical life and M2 level mechanical life.