Rivonia Blvrd

375 Annabel Hse

Rivonia Blvrd

Sandton

2128

Gauteng

South Africa

-26.04079

28.060437

16 Rd

Stanford Bus Prk

16 Rd

Midrand

1685

Gauteng

South Africa

-25.981142

28.130012

Superior Rd

Hightech Village

Superior Rd

Midrand

1685

Gauteng

South Africa

-25.982806

28.129443

300 Janadel Ave

Siemens Park

Janadel Ave

Midrand

1685

Gauteng

South Africa

-26.0049248

28.1187439

Electric contacts

Electric contacts are the electrical circuits found in electrical switches and breakers. They are made of two pieces of metals that conduct electricity and pass electrical current.

There are two different types of contacts, open and closed ones. Open contacts are those that are not in an electrical conducting state when a breaker or switch is operating. There is an insulating air gap that hinders current flow between the two metals at normal voltages. Closed contacts are contacts that are closed and are in a conductive state when the device operating it is in a relaxed condition.

Selection of material for contacts is essential so as to have a cost-effective contact. For example, silver tungsten has the ability to resist contact sticking and oxidation that may lead to corrosion of the metal. It is also able to sustain high furnace temperatures. The preferred material for electrical contacts is silver, gold and platinum. These have good conduction qualities though some cheaper metals may be used in the main contact to reduce costs. A superior metal, like gold, can then be used to coat the cheap metal.

Contact bounces are common in mechanical switches. They occur when contacts strike together. They then bounce apart one or several times before returning to a steady state. This poses a danger to people as it results in rapid pulsed electric transition from zero to full current. It also may cause great damage to circuits that respond very fast enough to misinterpret the on-off pulses.

To find more about electric contacts, browse our Yellow Pages listings at www.yellowpages.co.za.

Electric contacts

Electric contacts are the electrical circuits found in electrical switches and breakers. They are made of two pieces of metals that conduct electricity and pass electrical current.

There are two different types of contacts, open and closed ones. Open contacts are those that are not in an electrical conducting state when a breaker or switch is operating. There is an insulating air gap that hinders current flow between the two metals at normal voltages. Closed contacts are contacts that are closed and are in a conductive state when the device operating it is in a relaxed condition.

Selection of material for contacts is essential so as to have a cost-effective contact. For example, silver tungsten has the ability to resist contact sticking and oxidation that may lead to corrosion of the metal. It is also able to sustain high furnace temperatures. The preferred material for electrical contacts is silver, gold and platinum. These have good conduction qualities though some cheaper metals may be used in the main contact to reduce costs. A superior metal, like gold, can then be used to coat the cheap metal.

Contact bounces are common in mechanical switches. They occur when contacts strike together. They then bounce apart one or several times before returning to a steady state. This poses a danger to people as it results in rapid pulsed electric transition from zero to full current. It also may cause great damage to circuits that respond very fast enough to misinterpret the on-off pulses.

To find more about electric contacts, browse our Yellow Pages listings at www.yellowpages.co.za.

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