Silver Tungsten Low Voltage Contact

Silver Tungsten Low Voltage Contact Description

Electrical contacts build electrical connections between components in overvoltage protections, relays and switches.

Silver tungsten materials have good welding and arcing erosion resistance, high fusion welding resistance and less material transfer. It is widely used in industrial and domestic circuit breakers. The low material loss is beneficial for repeatable high interruption capacity.

Various types of silver-tungsten provide higher silver with higher electrical conductivity, and higher tungsten makes it more aggressive and efficient.

The silver and tungsten composite group combines the high thermal and electrical conductivity of silver with the high erosion resistance of the high melting tungsten. These materials are also characterised by their high strength and their resistance to welding or sticking. They are principally made by infiltration and the nominal silver content varies from 20-50%. By increasing the amount of tungsten, the hardness and welding is reduced. This composite group of alloys is specially prefered for use in air.

In addition to the characteristics of silver tungsten carbide, silver tungsten carbide also has higher hardness, which is more advantageous in strong arc situations.

The silver and tungsten carbide composites exhibit initial resistance to formation of surface films and possess good anti weld and arc erosion resistance. These are specially used for devices requiring more consistent millivolt drop as compare to silver tungsten.

Silver Tungsten Low Voltage Contact Applications and Related Industries

● High tungsten content: Burn-off contacts for large low-voltage circuit breakers

● Lower tungsten content: Moulded case circuit breakers and protective circuit breakers

● Packing and thread sealing

● Aerospace

● Aviation

● Electronics

● Electric power

● Metallurgy

● Machinery

● Sports equipment

● Research & Laboratory