Telesure Lane

Auto & General Park

Telesure Lane

Randburg

2055

Gauteng

South Africa

-25.9803685

28.0138512

1356 North Coast Rd

North Coast Rd

Avoca

4051

Kwazulu-Natal

South Africa

Premium

electrical contractors

6 Wattle Rd

Wattle Rd

Durban

4051

Kwazulu-Natal

South Africa

-29.756628

31.041716

83 Rochdale Rd

Rochdale Rd

Durban

Kwazulu-Natal

South Africa

-29.802827

30.990278

23 Umbilo Rd

Umbilo Rd

Kwazulu-Natal

South Africa

-29.860352

31.007412

12 Storm Rd

Storm Rd

Greenwood Park

4051

Kwazulu-Natal

South Africa

Corobrik Rd

Unit 14

Corobrik Rd

Durban

4017

Kwazulu-Natal

South Africa

-29.772815

31.003502

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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