Tungsten copper (WCu) materials are used for arcing contacts in SF6 circuit breakers for high and medium voltage applications. At the heart of the switching chamber, WCu arcing contacts are exposed to extreme mechanical and thermal stresses. During arcing, the temperature can reach levels ≥ 20,000 K, for instance.

The higher the applied voltage and current, the more resistant to arc erosion the contact material must be.By choosing the right proportions of tungsten and copper, it will be able to optimize the product's arc erosion properties.

Tungsten-copper has unique material properties. A high level of temperature resistance is one of the most important advantages of tungsten, while the copper content increases the electrical and thermal conductivity.

excellent arc resistance
outstanding electrical conductivity
high strength
good machinability
very good thermal conductivity
low thermal expansion

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