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Anonymous Poster #1

MCBs - AF AT Rating

12/13/2018 5:40 AM

Why don't the MCB's have AF/AT rating?
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Anonymous Poster #2
#1

Re: MCBs - AF AT Rating

12/13/2018 5:47 AM

Read this.
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Anonymous Poster #1
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Re: MCBs - AF AT Rating

12/13/2018 5:59 AM

Read jraef's comment in this thread, thats why I asked this question.

https://cr4.globalspec.com/thread/54902/AF-AT
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Anonymous Poster #2
#3
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Re: MCBs - AF AT Rating

12/13/2018 9:22 AM

That makes this one a duplicate thread.
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Paulusgnome
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#4

Re: MCBs - AF AT Rating

12/13/2018 3:10 PM

Because miniature circuit breakers are all one frame size.

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PWSlack
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#5

Re: MCBs - AF AT Rating

12/13/2018 5:36 PM

...for example, a 2A breaker, a 6A, a 16A, a 20A and a 32A breaker are exactly the same size:

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JRaef
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#6

Re: MCBs - AF AT Rating

12/14/2018 5:27 PM

Again, if by "MCB" you mean Miniature Circuit Breaker, then as recently answered by Paulusgnome and PWSlack, there is only one "frame" size, so there is no point in delineating something that is essentially meaningless.

If you are using "MCB" to mean "Main Circuit Breaker" then there could be an AF/AT rating on them. But nobody actually REQUIRES those ratings to be shown, it's just convention.

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