Circuit Breaker Moving Contact Bracket Assembly

The three-phase linked contact system utilizes a high-strength engineering plastic frame as an insulating carrier, integrating three parallel conductive circuits. Each circuit consists of upper and lower copper terminals, a central moving contact bridge, and a return spring. Synchronous opening and closing actions are achieved through a mechanical linkage running through the center. This modular layout is commonly found in the core arc-extinguishing chamber of molded case circuit breakers (MCCBs), designed to carry high currents and rapidly切断 the circuit during faults.

Key manufacturing focuses include ensuring consistent contact pressure between static and moving contacts, as well as mechanical synchronization across the three phases. Metal inserts undergo precision stamping and silver plating to reduce contact resistance and enhance resistance to arc erosion. The plastic base ensures dimensional stability in high-temperature environments, preventing jamming or insulation failure due to thermal deformation. Strict controls are applied to screw tightening torque and the friction coefficients of moving parts during assembly.

Supported by an ISO 9001 quality management system, the factory is equipped with video measuring machines and DC low-resistance testers for 100% inspection of key mating dimensions and conductive circuit resistance, ensuring batch consistency. We offer one-stop services from mold development, precision stamping, and injection molding to automated assembly. Custom contact assemblies with varying pole numbers and rated current specifications can be produced based on customer-provided 3D drawings, meeting stringent standards for safety clearance and mechanical life in power distribution systems.