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thekietdhbk
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Join Date: Oct 2010
Posts: 1

AC MCCB and DC MCCB

10/17/2010 11:29 AM

How to connect AC MCCB in DC network ?
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Paulusgnome
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Location: Christchurch, New Zealand
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#1

Re: AC MCCB and DC MCCB

10/17/2010 1:18 PM

It depends on the manufacturer. Many AC MCCBs also have a DC rating.

The tricky bit is that quite often the voltage of your DC system is greater than the (per-pole) rating of the MCCB. It is then necessary to connect multiple poles of the MCCB in series to get the rating that you need.

I suggest you consult the technical data published my your MCCB's manufacturer, this should have the information that you need.

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electricalexpert65
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Join Date: Oct 2009
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#2

Re: AC MCCB and DC MCCB

10/18/2010 9:09 AM

Two poles in series on the positive side and one pole on the negative side. But, please check with the manufacturer as to the reduced breaking capacity in DC.
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

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Location: California, USA, where the Godless live next door to God.
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#3
In reply to #2

Re: AC MCCB and DC MCCB

10/18/2010 2:11 PM

Totally location dependent. Here in the US we are not allowed to break the grounded side, whether it's positive or negative.

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