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Thread: Regarding the Cuicuit Breaker (MCB)

  1. #1
    Join Date
    Oct 2009
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    Question Regarding the Cuicuit Breaker (MCB)

    Dear all, i am really a new bee in the electrical industry, and i need to learn about the basic conponents of the cuicuit to do the design

    is there anyone can kindly advice me about the MCB, especially the difference between the 1p 1p+n and 2p MCB & 3p 3p+n and 4p MCB?

    as well as the usage (where & when) of the above MCBs. Thanks very much in advance

  2. #2
    Join Date
    Jun 2003
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    5,672
    I assume 1p means a single pole breaker, 2p is a two pole breaker, and 3p is a three pole breaker.

    Are you familiar with three phase systems? If not, you need to find some reading material on this.

    1p+n, 2p+n and 3p+n probably means a "1 pole plus neutral", "2 pole plus neutral", and "3 pole plus neutral". That doesn't make much sense for circuit breakers because the neutral wire is never ran through a breaker, it is tied on to the neutral bus. But it does make sense for describing a load, or the wiring to the load.

  3. #3
    Join Date
    Feb 2003
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    Wisconsin
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    Quote Originally Posted by Yuyu_XX View Post
    Dear all, i am really a new bee in the electrical industry, and i need to learn about the basic conponents of the cuicuit to do the design

    is there anyone can kindly advice me about the MCB, especially the difference between the 1p 1p+n and 2p MCB & 3p 3p+n and 4p MCB?

    as well as the usage (where & when) of the above MCBs. Thanks very much in advance
    The terminology you are using is not common in North America.

    1P - is a single set of contacts which have overcurrent protection

    1P +N - is two sets of contacts, one has overcurrent protection and the other is simply a switch. In the US we call this type of breaker a 2-wire Switched Neutral

    2P - is two sets of contacts, both with overcurrent protection

    3P - is three sets of contacts, all with overcurrent protection

    3P + N - is four sets of contacts, three with overcurrent protection and the fourth is simply a switch

    4P - is four sets of contacts, all with overcurrent protection

    You can find more information by looking at literature from manufacturers that make both European and North American equipment. Try someone like Schneider Electric and their Merlin Gerin breakers.
    Just because you can, doesn't mean you should.

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