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different circuit breaker

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sohail qureshi

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hi dude...i wanna ask a question, any help will be appreciated

my question is.......
what is the difference between OIL circuit breaker, GAS circuit breaker and AIR circuit breaker..???
and which one is latest....??? tnx in advance
 

Hi . sorry my last post was wrong because i could not understand your mean
 
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Hi Sohail,
In normal use there are just 2 types of Circuit breakers, Oil Immersed contact type and Air type.

1. Oil circuit breakers are high-voltage circuit breakers that have their contacts immersed in oil. The main disadvantages of oil circuit breakers is the fact that the oil can be flammable and it may be hard to keep the oil fresh and in good condition (requires changing and purifying the oil).

2. Low voltage normally use the Air type breakers, as no ARC is expected across the contacts.

There is no GAS type circuit breakers as far as the contacts are concerned.
Hope this will help.

Raza
 
Oh my friend!
Hi
Sorry I was wrong( i couldnt understand your mean)
Yes
Reza is right
 

Gas circuit breaker are for very high voltages. You can see it here (from Mitsubishi):
Gas Circuit Breakers

Those circuit breakers cover a full range of voltages from 15 kV class to 550 kV. (!!!)

Due to environmental and cost concerns over insulating oil spills, most new breakers use SF6 gas to quench the arc.
A sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur hexafluoride gas to quench the arc. They are most often used for transmission-level voltages and may be incorporated into compact gas-insulated switchgear. In cold climates, supplemental heating or de-rating of the circuit breakers may be required due to liquefaction of the SF6 gas.

Read more here:
Circuit breaker - Wikipedia, the free encyclopedia

Hope this helps.
Tahmid.
 

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