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Electrical contacts

Over 50 years’ experience supports us in the production of electrical contacts; our quality, delivery times, and competitive prices make us one of the best options on the market for the electrical and railway markets.

Electrical contacts are part of the electrical conduction and their main function is to open and/or close the electrical circuit of the equipment in question. The manufacture of electrical contacts is carried out using either powder metallurgy, or casting processes, thus obtaining defined geometries and the correct chemical, electrical, and mechanical properties required for the product. To ensure all your requirements are met, we operate our own laboratories where we perform the corresponding tests to guarantee the properties required by the material.

The main characteristics of the electrical contacts are as follows:

  • High electrical conductivity.
  • High thermal conductivity.
  • High resistance to corrosion.
  • Low surface resistance.
  • High mechanical resistance.
  • Resistance to welding.
  • Resistance to electric arc use.
  • High melting point.

Electrical contacts

The contacts produced by Etal can be used for low, medium, and high-voltage currents, each possessing different characteristics, among the most representative are:

Low voltage: fine silver, silver-copper, silver-palladium, silver-cadmium oxide, and silver-nickel.

Characteristics: high electrical conductivity.

Medium voltage: silver-cadmium oxide, silver-tin oxide, silver-tungsten.

Characteristics: Semi-refractory materials with a relatively high electrical conductivity and with high resistance to welding, as well as good mechanical properties. The contacts with the cadmium-oxide alloy are among the most popular materials used in the electrical industry.

High voltage: tungsten-copper, tungsten-silver, silver-molybdenum, silver-tungsten carbide, 100% tungsten, 100% molybdenum.

Characteristics: Due to the use of refractory materials, such as tungsten or molybdenum, in combination with silver, these materials provide high mechanical resistance, as well as resistance to the use of the electric arc.

The properties of these electrical contacts are as follows:

  • Chemical properties: high resistance to oxidation and corrosion.
  • Electrical properties: high resistance to the erosion caused by the electric arc; maximum arc current, and limit stress; low contact resistance, and low resistivity.
  • Mechanical properties: resistance to deterioration and optimum strength.
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