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Anonymous Poster

MCCBs

03/17/2010 12:08 AM

What's the Difference Between TPN and 4P MCCB?
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
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#1

Re: MCCB

03/17/2010 6:26 AM

If they mean what I think they mean, you shouldn't be on an Automotive blog. Try Electrical Eng.

Cheers.........Codey

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Anonymous Poster
#2

Re: MCCBs

03/17/2010 11:09 PM

TPN assuming stands for triple pole and neutral. This generally means that the neutral connection remains a solid connection i.e. it is not switched. 4P would be a 4 pole device and generally all 4 poles would be switched.
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capblanc
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Join Date: Jul 2008
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#3
In reply to #2

Re: MCCBs

03/18/2010 4:49 AM

Not quite correct. TPN has the three phases protected and the Neutral is an ordinary switch. thus if the circuit trips it also isolates the neutral but, if somehow (eg a short circuit to phase from another circuit) the neutral alone is is in overcurrent then that will not initiate a trip.

regards Chas

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