What are the desired characteristics of material used for electrical contacts?

The desirable properties of electrical contact materials include such characteristics as high electrical conductivity to minimize the heat generated during passage of current; high thermal conductivity to dissipate both the resistive and arc heat developed; high resistance to chemical reactions in all application …

What are the material used for electrical contacts?

Electrical contacts are generally made from metals with high electrical conductivity, except in applications such as high-power equipment brushes where abrasive wear is expected. The most commonly used metal surfaces for contact alloys are silver, copper, gold, platinum, and palladium.

What properties would you look for in contact materials?

they have to exhibit physical, mechanical, and chemical properties like high electrical and thermal conductivity, high hardness, high corrosion resistance, etc and besides this should have good mechanical workability, and also be suitable for good weld and brazing attachment to contact carriers.

What factors consider contact material selection?

The total resistance of electrical contacts must be as minimum as possible to reduce the switch losses. Hence, material being selected for electrical contacts, must possess high electrical conductivity.

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What are electrical contacts used for?

An electrical contact a switch that uses a secondary, low-voltage power source to complete or interrupt circuits that affect an electrical current. Unlike relays, they carry higher circuit loads and connect directly to high-voltage feeds, and they don’t interrupt short circuits like circuit breakers.

Why is silver used for electrical contacts?

Silver cadmium contacts and other components are used in electrical devices because they possess two contradictory traits. First, they are excellent conductors of electricity. Second, they are also arc-resistant, which mean that they inhibit the tendency of electricity to arc between open contacts and cause fires.

Which material is commonly used for making the arch of circuit breaker?

Explanation: Copper tungsten alloy is commonly used for making the arch of circuit breakers.

What are the characteristics of materials?

A description of some common mechanical and physical properties will provide information that product designers could consider in selecting materials for a given application.

  • Conductivity.
  • Corrosion Resistance.
  • Density.
  • Ductility / Malleability.
  • Elasticity / Stiffness.
  • Fracture Toughness.
  • Hardness.
  • Plasticity.

What are the characteristic of the materials that give their uses?

All these factors or the properties that the material possesses, gives us their uses in different or in various works. Also, the materials’ brittleness, malleability, hardness, ductility, strength, hardenability are also responsible for their usage in different or various fields or works.

Why is there need to know the characteristics of materials?

Storage and handling of matter requires a knowledge of its properties. … Knowledge of properties like malleability and ductility are needed when trying to make something out of a particular material. For example, gold can be used to make jewelry, copper can be used for making wires, etc.

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What are contact materials?

Electrical contact materials refer to a class of metals that are used in the electrical interfaces of electrical connectors and electrical switches. … Other conductors such as precious metals, tin, tin alloys, and selected silver alloys are used as coatings on electrical contact surfaces.

What are the characteristics should you look for when you select your materials for a project?

The following are some factors that one should consider while deciding construction materials:

  • Cost. When looking for various construction materials, one will realize that the rate varies extensively. …
  • Climate. …
  • Durability. …
  • Availability. …
  • Sustainability. …
  • Maintenance. …
  • Aesthetic Appeal. …
  • Performance.

What are the 3 factors in selecting the right materials?

The basic three things to consider while choosing a material are the cost of the material, the producer of the material, and the brand of the material. Explanation: The basic three things to consider while choosing a material are the cost of the material, the producer of the material, and the brand of the material.