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Associate

Join Date: Mar 2014
Location: Mumbai, India
Posts: 25

Making Capacity of an Air Circuit Breaker

03/07/2017 4:49 AM

1. What is the reason of specifying a making capacity of a ACB? Why Breaking Capacity of ACB does not come in picture when ACB is Switched ON on fault? And as Making Capacity is peak sensing, how RMS Sensing Releases will sense them? Thanks in Advance.

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Guru

Join Date: Mar 2007
Location: at the beach in Florida
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#1

Re: Making Capacity of an Air Circuit Breaker

03/07/2017 1:04 PM

This is not a search engine....

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Guru
Hobbies - DIY Welding - Wannabeabettawelda

Join Date: May 2007
Location: Annapolis, Maryland
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#2
In reply to #1

Re: Making Capacity of an Air Circuit Breaker

03/07/2017 1:31 PM

But works like one, except better. Of course it does come with its own special flavor of abuse.

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Guru

Join Date: Apr 2007
Posts: 551
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#3

Re: Making Capacity of an Air Circuit Breaker

03/08/2017 3:46 AM

Well I think the website got a lot of information that he can search from there.

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Guru
Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
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#4
In reply to #3

Re: Making Capacity of an Air Circuit Breaker

03/08/2017 9:35 AM

True, but it takes a sharp eye and and an engineering mind to separate the wheat from the chaff on this or any other site; i.e., if you don't understand the nature of your question then any answer will look good to you.

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Associate

Join Date: Mar 2014
Location: Mumbai, India
Posts: 25
#5
In reply to #4

Re: Making Capacity of an Air Circuit Breaker

03/08/2017 9:56 AM

I did not understand last reply RAMConsult. Regards

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Power-User
New Zealand - Member - Kiwi

Join Date: Oct 2007
Location: Christchurch, New Zealand
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#6
In reply to #5

Re: Making Capacity of an Air Circuit Breaker

03/08/2017 2:14 PM

And therein lies the source of the problem.

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Guru
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Join Date: Sep 2009
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#7

Re: Making Capacity of an Air Circuit Breaker

03/11/2017 5:56 AM

In many compact ACBs (note "compact") the CB can successfully make the short-circuit current, but cannot latch on. In effect, such a CB acts like a current limiting CB. So it may chatter, and destroy itself. To prevent this, the CB is assigned a making current value, at which it will make and latch successfully. It may not have the capacity tobreak the SC current.

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Brave Sir Robin (1); Jignesh Shah (1); kvsridhar (1); Paulusgnome (1); RAMConsult (1); Simon Wan (1); SolarEagle (1)

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