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martin882
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Join Date: Apr 2012
Posts: 7

MCB

08/06/2012 2:30 PM

i would like to know how u select the appropriate MCB of the same current rating,,, for example in our metre boxes in our country thre are 60 amp MCBs and in the distribution boards in our houses there is also 60 amp main breaker,,,, i would like to know what is the difference between MCBs of the same rating,,,,,,?
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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
#1

Re: MCB

08/06/2012 5:26 PM

It might be the inclusion of Earth Fault protection, it might be the Trip Curve selection, there could be several things. No way for us to know from here.

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nobodysomebody47
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Join Date: Nov 2011
Posts: 171
Good Answers: 1
#2

Re: MCB

08/06/2012 6:13 PM

check this, it may help you

The selection of The correct miniature circuit breaker
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#3

Re: MCB

08/07/2012 3:13 AM

Circuit breaker rating is related to the downstream circuit characteristics. British Standard 7671 gives full details.

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