The built-in linkage shaft of the handle of each pole of the circuit breaker is an important mechanical component in the multi-pole circuit breaker, which is used to ensure that the handles of multiple poles (such as three-pole or four-pole) move synchronously during operation, so that all poles can break or close the circuit at the same time. This is crucial for the safety and reliability of the circuit, especially in application scenarios where three-phase power supply or multiple circuits need to be protected.

Synchronous operation: The operating handles of multiple poles are connected through the linkage shaft, so that when the user operates one pole, the other poles can also move synchronously, ensuring that the breaking and closing of all poles are completed synchronously. This can prevent the circuit breaker from disconnecting only one phase while the other phases are still energized, thereby avoiding dangerous situations.

Enhanced reliability: The linkage shaft ensures that the multiple poles of the circuit breaker will not have inconsistent actions through the mechanical structure, reducing the possible time differences or failures between the poles, and increasing the reliability of the overall operation of the circuit breaker.

Handle linkage: When the user manually operates the circuit breaker, through the action of the linkage shaft, unified operation of all poles can be achieved on a single handle without controlling each pole separately.