Tungsten Copper as Vacuum Circuit Breakers
Vacuum Circuit Breakers (VCBs) are widely used in medium to high-voltage power distribution systems. A key component of VCBs is the contact material inside the vacuum interrupter, which must withstand high-energy arcs while maintaining stable performance. Tungsten copper (W-Cu) alloys, with their unique combination of arc resistance, thermal and electrical conductivity, and mechanical integrity, have become the preferred material for VCB contacts—especially in applications requiring high switching frequency or high short-circuit breaking capacity.
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Advantages of W-Cu in VCB Contacts
1.Excellent Arc Erosion Resistance
The high melting point (~3410°C) and strength of tungsten help maintain contact shape and surface integrity under intense arcing, thus extending switch life.
2.Good Electrical and Thermal Conductivity
The copper phase ensures low contact resistance and efficient heat dissipation, minimizing local overheating.
3.Low Vapor Pressure and Vacuum Compatibility
W-Cu materials exhibit very low volatilization rates under vacuum, reducing the risk of contaminating the vacuum chamber and ensuring long-term device reliability.
4.Balanced Mechanical Properties and Machinability
W-Cu offers a balance between hardness and machinability, making it suitable for producing complex contact geometries such as grooved, convex, or toothed surfaces that enhance arc quenching.
Typical Application Scenarios
1.Medium-voltage power distribution (3.6kV–36kV)
2.Heavy-duty electrical systems in railways, mining, petrochemicals
3.Circuit protection in power plants and substations
4.High-frequency switching breakers
Common Grades and Structural Designs
Typical grades: W70Cu30, W75Cu25, W80Cu20
Common geometries: disk-shaped contacts, symmetric concave contacts, multi-groove structures
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Email: sales@chinatungsten.com
Tel.: +86 592 512 9696 ; +86 592 512 9595