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buiducthang
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Join Date: May 2014
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What is AT&AF in Circuit Breaker

05/09/2014 11:20 AM

Hi everyone. I am very confused with the AT and AF parameter in a circuit breaker. The fact that i see it in shop drawing and would like to know what is the meaning of these? Can you help me, please?
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lyn
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#1

Re: What is AT&AF in Circuit Breaker

05/09/2014 12:36 PM

Fundamental characteristics of a circuit-breaker - Electrical ...

What is AT and AF of 40AT/50AF CIRCUIT BREAKER? - Yahoo

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buiducthang
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#2

Re: What is AT&AF in Circuit Breaker

05/09/2014 12:56 PM

I checked the link you sent. Its very useful, but i dont feek more clearly about my issue.
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Blackpaper
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#3
In reply to #2

Re: What is AT&AF in Circuit Breaker

05/09/2014 1:20 PM

feek?
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PWSlack
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#16
In reply to #3

Re: What is AT&AF in Circuit Breaker

06/21/2023 7:17 AM

<...feek...> that.

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lyn
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#4
In reply to #2

Re: What is AT&AF in Circuit Breaker

05/09/2014 1:27 PM

I don't know how to make it any more clearly than:

AT = Amp Trip

AF = Amp Frame

Modern circuit breakers are manufactured in a limited number of mechanical "frame" sizes, and then outfitted with interchangeable trip units. A 50 Amp Frame circuit breaker configured with a 40 Amp trip unit will provide protection for a nominally 40 A circuit. Depending on the breaker, it could be outfitted with up to a 50 Amp trip unit, since 50 A is the maximum continuous rating of the breaker current-carrying parts.

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redfred
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#6
In reply to #2

Re: What is AT&AF in Circuit Breaker

05/09/2014 5:01 PM

Instead of just repeating that you do not understand these two attributes why don't you explain what think you do understand and try to explain why the answers you have been given do not end your confusion.

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PWSlack
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#5

Re: What is AT&AF in Circuit Breaker

05/09/2014 3:11 PM

Refer to previous threads on this topic.

http://cr4.globalspec.com/search/sitesearch?do=show&srchobjs=t%2Cc&order=asc&fs=12&sort=textmatchrank&srch=AT%20and%20AF

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buiducthang
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#7

Re: What is AT&AF in Circuit Breaker

05/10/2014 1:25 AM

Thanks all, i understand now.
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Tornado
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#8
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Re: What is AT&AF in Circuit Breaker

05/10/2014 2:03 PM

Your understanding and gratitude deserved the Good Answer I gave.

I apologize for the shameful individual who cancelled it.

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lyn
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#9
In reply to #8

Re: What is AT&AF in Circuit Breaker

05/10/2014 2:22 PM

In deference to you, I'll replace the GA. I didn't vote the response OT, it was refreshing to hear.
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lyn
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#11
In reply to #9

Re: What is AT&AF in Circuit Breaker

05/10/2014 9:04 PM

Oh well.
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buiducthang
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#10
In reply to #8

Re: What is AT&AF in Circuit Breaker

05/10/2014 8:51 PM

I'm grateful with the support from members of forum. Im a new member, so I need more the sharing from everyone. I will continue following the forum in the future.
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Tornado
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#12
In reply to #10

Re: What is AT&AF in Circuit Breaker

05/10/2014 9:16 PM

Welcome aboard. There are several Vietnamese members; maybe you can meet one another locally, too.

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DmanEng
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#13

Re: What is AT&AF in Circuit Breaker

05/13/2014 3:35 AM

too much of random engineering here, all fakes in the living room pasting row intel from google. what a bunch of losers

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redfred
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#14
In reply to #13

Re: What is AT&AF in Circuit Breaker

05/13/2014 7:49 AM

you should then contribute better quality instead of criticize. Unless....

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lyn
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#15
In reply to #13

Re: What is AT&AF in Circuit Breaker

05/13/2014 9:30 AM

"what a bunch of losers"

You'll be a good fit here, then! Especially with contributions such as this one.

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Users who posted comments:

Blackpaper (1); buiducthang (3); DmanEng (1); lyn (5); PWSlack (2); redfred (2); Tornado (2)

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