A circuit breaker is a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The function of the circuit breaker is to cut off and connect the load circuit and cut off the fault circuit.

Outdoor circuit breakers are switches for outdoor power transmission and distribution lines. The vacuum circuit breaker is named for its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum. Vacuum outdoor circuit breakers are used to open and close power transmission circuits. They are suitable for frequent outdoor operations and have the advantages of arc extinguishing without maintenance. They are widely used in distribution networks.

A circuit breaker is a device that interrupts an electric circuit to prevent unwarranted current, caused by a short circuit, typically resulting from an overload. Its basic functionality is to interrupt current flow after a fault is detected. A vacuum circuit breaker is a kind of circuit breaker where the arc quenching takes place in vacuum medium. The operation of switching on and closing of current carrying contacts and interrelated arc interruption takes place in a vacuum chamber in the breaker which is called vacuum interrupter.

Indoor Vacuum circuit breakers, these are designed to be used inside buildings or in weather-resistant enclosures. They are typically operated at a medium voltage with a metal clad switchgear enclosure.

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