Working principle of vacuum circuit breaker
Mar 10, 2022
Working principle of vacuum circuit breaker
In simple terms, when the dynamic and static contacts of the circuit breaker are driven by the operating mechanism to perform the opening action, a certain arc will be generated between the contacts. At the same time, the surface of the contact of the vacuum circuit breaker volatilizes steam under the action of high temperature. Because the structure and shape of the contact are specially designed, the magnetic field phenomenon will be caused when the current passes. Then the arc at this time will move rapidly along the tangential direction of the contact surface under the action of the magnetic field, and a part of the metal vapor will condense on the shield. When the arc naturally crosses zero, it will be extinguished. The medium strength of the head key will be quickly restored again
