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Other materials, such as silver, tungsten and tungsten compounds, are used in other interrupter designs. The vacuum interrupter's contact materials has a great influence on its breaking capacity, electrical durability and level of current chopping.
Contact material is chosen for high electrical conductivity, mechanical strength, and stability under arcing and oxidation. Commonly used metals include alloys of tungsten, molybdenum, copper, and others. For example, motor circuit contactors may use contacts made of silver with cadmium oxide added to improved durability and arc resistance. [2]
An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. [1] Each contact is a piece of electrically conductive material, typically metal .
Primarily for copper-to-copper. Can be used also on silver, tungsten and molybdenum. Low vibration resistance. Light copper color. Used in plumbing. Frequently used for resistance brazing. Used where ductility is important and low tolerances are not achievable. Ductile copper-copper joints. Used on electrical assemblies, e.g. motors or contacts.
[1] [2] [3] For example, if a 1 m 3 solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m. Electrical conductivity (or specific conductance) is the reciprocal of electrical resistivity. It represents a material's ability to conduct ...
These selenium rectifiers were used (and are still used) to convert alternating current to direct current in electrical power applications. During 1925–1940, diodes consisting of a pointed tungsten metal wire in contact with a silicon crystal base, were fabricated in laboratories to detect microwaves in the UHF range.
Silver tungstate is an inorganic tungstate with the chemical formula Ag 2 WO 4. It has been applied in various fields such as photoluminescence, antibacterial action, ozone gas sensors and humidity sensors. [2] [3] It is also used in the electronic and chemical industries, and also used in proteomics research. [4]
When the contact is very fine grained (VFG), the electrical conductivity is much higher than a normal piece of copper tungsten. [6] Copper tungsten is a good choice for a vacuum contact due to its low cost, resistance to arc erosion, good conductivity, and resistance to mechanical wear and contact welding.