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Eng.Alnajjar
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Join Date: Apr 2010
Posts: 3

Ultimate Short Circuit Breaking Capacity

04/02/2010 3:18 AM

Please can anyone give only certain information:

If the value of the ultimate short circuit breaking capacity(Icu) for a (200 A) MCCB is specified by the electrical company to be (50 KA) at a voltage of 127/220 V . Can we know from this information what will be the value of Icu for the same MCCB @ 220/380 V ?
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Anonymous Poster
#1

Re: Ultimate Short Circuit Breaking Capacity

04/02/2010 11:09 AM

You can see the catalog of the manufacturer of the MCCB.

For example:

MCCB SIEMENS 3VL37 20-1DC36-0AA0 Ir=160-200A has 65kA at 240V and 25kA at 440VAC.

MCCB SIEMENS 3VT27 25-2AA36-0AA0 Ir=100-250A has 65kA at 240V and 36kA at 415VAC.

MCCB SIEMENS 3VT27 25-3AA36-0AA0 Ir=100-250A has 100kA at 240V and 65kA at 415VAC.

MCCB MERLIN GERIN NS250N-TM200D Ir=160-250A has 85kA at 240V and 35kA at 440VAC.

MCCB MERLIN GERIN EZC250N3200 Ir=200A has 50kA at 240V and 25kA at 440VAC.

I hope to help you

Ricky
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Eng.Alnajjar
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Join Date: Apr 2010
Posts: 3
#2
In reply to #1

Re: Ultimate Short Circuit Breaking Capacity

04/02/2010 2:23 PM

thx very much
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PWSlack
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#3

Re: Ultimate Short Circuit Breaking Capacity

04/06/2010 3:12 AM

Contact the equipment manufacturer directly.

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