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Anonymous Poster

Electrical

02/11/2009 1:15 PM

dear manufacturers,

What is meant by current making /Breaking capacity
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Anonymous Poster
#1

Re: Electrical

02/11/2009 4:34 PM

easy questian!

makeing capacity is how fast you can make your car go. breaking capacity is how fast you can break your car.
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craigza
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South Africa - Member -

Join Date: Nov 2008
Location: Johannesburg
Posts: 295
Good Answers: 12
#2

Re: Electrical

02/12/2009 1:10 AM

Hi there,

Current making/breaking capacity is the rating that the contact/switch/breaker etc can close/open at. This means that the component can switch safely whith that amount of current flowing through it. In real life though - you would never rate your equipment for that limit - you would go for the next biggest size.

Regards,

Craig
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sb
Guru

Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#3

Re: Electrical

02/12/2009 4:12 AM

Assume there is a fault in a line and a breaker is activated.

Then there is a maximum fault current that the breaker can break. If the current is more than that, the breaker can not extinguish the arc between its pole. This is the breaking capacity.

Now Let us say you have tried to close the breaker without clearing the fault. Then there is going to be a fault current as soon as the breaker contacts close. This maximum current is the making capacity of the breaker.

Also there is a possibility that there is another breaker downstream and the fault is beyond that, then you want your breaker to carry a fault current (for some very short time) and let the other breaker trip. This is called short duration capacity.

__________________
 Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
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sb
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Join Date: Mar 2007
Posts: 2550
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#4
In reply to #3

Re: Electrical

02/12/2009 4:17 AM

went OT by a click of button

__________________
 Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
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Lspraba
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Join Date: Sep 2008
Location: India
Posts: 91
Good Answers: 6
#5
In reply to #3

Re: Electrical

02/16/2009 7:10 AM

very good answer
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