Design and materials of linkage shaft
Design features:
Simple structure: The linkage shaft is usually designed to be simple for easy installation and maintenance. Its core function is to drive multiple poles to operate simultaneously by rotating or sliding.
Anti-misalignment design: To prevent misalignment or asynchronism between poles during operation, the linkage shaft usually has a limiter or positioning structure to ensure that the movement of all poles is completed within the specified range.
Material selection:
Metal material: The linkage shaft usually uses metal materials such as stainless steel or high-strength alloy steel to ensure that it has sufficient mechanical strength and durability under frequent operation and high current impact.
Surface treatment: In order to prevent rust or aging in a humid or corrosive environment, the linkage shaft may be galvanized, nickel-plated or rust-proof coated to enhance its corrosion resistance.
Working principle
In a multi-pole circuit breaker, each pole corresponds to a contact and a handle, and the linkage shaft connects these handles. When the user operates the circuit breaker, the linkage shaft moves all handles synchronously through mechanical linkage, thereby ensuring that the contacts of each pole are closed or opened at the same time.

Closing operation: When the user pushes the handle to the closed position, the linkage shaft drives the contacts of all poles to close at the same time, so that all phases of the circuit are turned on at the same time.
Disconnecting operation: When an overload, short circuit or user needs to manually disconnect the circuit, the handle of the circuit breaker is pushed to the disconnecting position, and the linkage shaft causes the contacts of all poles to disconnect synchronously, ensuring that all phases of the circuit are disconnected at the same time.