Telesure Lane

Auto & General Park

Telesure Lane

Randburg

2055

Gauteng

South Africa

-25.9803685

28.0138512

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179 Goedehoop Av M57

Erf 179 Dooringkloof

Goedehoop Av M57

Pretoria

0001

Gauteng

South Africa

-25.843483

28.251907

449 Braam Pretorius St

Braam Pretorius St

Pretoria

0182

Gauteng

South Africa

-25.687376

28.235023

682 Roeloe St

Roeloe St

Pretoria

0129

Gauteng

South Africa

-25.674174

28.227129

636 Ella St

Ella St

Pretoria

0084

Gauteng

South Africa

-25.72147

28.21168

239 EsselenSt

EsselenSt

Sunnyside

0132

Gauteng

South Africa

-25.75304

28.20604

Pretorius St

City Cntr

Pretorius St

Pretoria

0084

Gauteng

South Africa

-25.718468

28.205308

531 Soutter St

Soutter St

Pretoria

0183

Gauteng

South Africa

-25.7533

28.1512

Pretorius St

Die Meent

Pretorius St

Pretoria

0001

Gauteng

South Africa

-25.74729

28.19127

253 Imam Haron Rd

Newlands Old Brewery Plce

Imam Haron Rd

Claremont

7735

Western Cape

South Africa

-33.983713

18.486269

3 Bazaar St

Bazaar St

Pretoria

0183

Gauteng

South Africa

-25.73698

28.17379

144 General Beyers St

General Beyers St

Pretoria

0182

Gauteng

South Africa

-25.66779

28.17763

5446 Olivenhout Bascit Ext 24

Olivenhout Bascit Ext 24

Centurion

0002

Gauteng

South Africa

302 Vermeulen St

Vermeulen St

Pretoria

0001

Gauteng

South Africa

-25.744113

28.200776

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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