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badar
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Join Date: Apr 2008
Location: Riyadh - Saudi Arabia
Posts: 29

MCCB 300AT/400FT

10/06/2009 6:01 AM

Can some body explain me the meaning of AT & AF rating? is it at ambient rating & Air force rating?
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msamad
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Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#1

Re: MCCB 300AT/400FT

10/06/2009 8:51 AM

AT – Ampere Trip (Breaker size)

AF – Ampere Frame (Frame size of the breaker)

AF should be greater or equal to AT.

If AF greater than AT, the breaker can be easily replaced with a higher size for future expansion.

See http://cr4.globalspec.com/thread/36609 for more detail.

- MS

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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#2

Re: MCCB 300AT/400FT

10/06/2009 1:11 PM

I vote for this as the most often asked question in this forum.

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 ** All I every really wanted to be, was... A LUMBERJACK!.**
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