Can MCCB detect imbalance?

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Anonymous Poster	Can MCCB detect imbalance? 11/16/2009 2:58 AM
	Can a,say, 3 pole MCCB detect an imbalance in the phase or in other wrds, if the current in 1 phase flowin in one pole of the breaker is diff from the other, how will the MCCB react to this imbalance condition? does it trip or ignore the imbalance in current or ??? thanks in advance..
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PWSlack Guru 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	#1 Re: Can MCCB detect imbalance? 11/16/2009 3:01 AM
	No, it doesn't. All it does is trip if the current in any one of the three poles exceeds its trip rating. How long it takes to trip at whatever current is its charateristic, usually summarised with a letter: typically B, C or D. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Anonymous Poster	#2 In reply to #1 Re: Can MCCB detect imbalance? 11/16/2009 3:53 AM
	thanks for tat instant reply :)..
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#5 In reply to #1 Re: Can MCCB detect imbalance? 11/16/2009 8:54 AM
	Charectersitics 'B', 'C' & 'D' are applicable only to MCBs and NOT to MCCBs.
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PWSlack Guru 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	#6 In reply to #5 Re: Can MCCB detect imbalance? 11/16/2009 9:13 AM
	One C too many. D'oh! __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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jonald Commentator Join Date: Sep 2009 Location: Singapore Posts: 77 Good Answers: 1	#3 Re: Can MCCB detect imbalance? 11/16/2009 4:00 AM
	MCCB does'nt react to imbalance condition. MCCB is for overcurent or shortcircuit protection only. MCCB setting is 250% (maximum).
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#4 Re: Can MCCB detect imbalance? 11/16/2009 8:53 AM
	No! MCCBs cannot react to unbalance conditions by themselves. They are but passive devices. However, you can go for an external current unbalance relay to detect any current unbalance and a contact of this relay can be connected to the shunt release coil of the MCCB.
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Anonymous Poster (1); electricalexpert65 (2); jonald (1); PWSlack (2)

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