Vacuum Circuit Breaker Component Machining

Vacuum Circuit Breaker Component Machining

The machining of vacuum circuit breaker components is a precision manufacturing process that involves various mechanical machining techniques and quality control measures to ensure the accuracy and reliability of the parts.

Material Selection

  • The selection of materials for components is based on their specific functions and performance requirements within the vacuum circuit breaker. For example, contacts are typically made of Cr-Cu alloy due to its excellent arc-resistant properties and low contact resistance.

Cutting and Shaping

  • Raw materials are first cut to the required dimensions and shapes using cutting processes such as laser cutting, plasma cutting, or wire cutting.
  • Shaping processes like forging, die-casting, or machining are used to form the preliminary contours of the components.


  • Components undergo machining processes such as turning, milling, drilling, and grinding to achieve precise dimensions and tolerances as specified in the design drawings.
  • CNC machines may be used during machining to improve precision and repeatability.

Surface Treatment

  • To enhance the corrosion resistance and wear resistance of components, surface treatments such as plating, spraying, or anodizing may be applied.
  • Surface treatment of critical parts like contacts is particularly important as it directly affects the conductivity and arc management of the circuit breaker.

Quality Control

  • Throughout the machining process, strict quality control is maintained through various inspection methods such as coordinate measuring, surface roughness testing, and dimensional inspection.
  • Quality checks may be conducted after each machining step to ensure that components meet design and performance standards.

Preparation Before Assembly

  • Machined components need to be thoroughly cleaned and deburred before assembly to prevent damage to other parts or affect the performance of the vacuum circuit breaker during assembly.

Assembly and Final Testing

  • Components are assembled according to design requirements, and special fasteners and connectors may be used during the assembly process.
  • After assembly, final performance tests are conducted, including insulation tests, voltage withstand tests, and operational life tests, to verify the overall performance of the vacuum circuit breaker.

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