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Contact Materials

Silver Carbon
Silver carbon (graphite) contact materials are used in a diverse range of applications.

Rheostatic devices, for instance, often use silver carbon primarily for its self-lubricating properties. Silver carbon is also used in circuit breaker and switching applications due to its excellent anti-welding properties and its relatively stable contact resistance. The carbon content can be varied from 0.5% to 8.0% of the contact mass. As carbon content increases, the resistance to sticking will improve, although conductivity will decease slightly. The disadvantages of silver carbon are its relatively high erosion rates, poor arc mobility, its limited ductility, and its relatively high cost.