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CR44
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Join Date: Feb 2010
Posts: 8

Breaker Ratings and Conversions

03/17/2010 8:20 AM

Hellow every one.

What is the formula to convert the breaker MVA rating into KA & vice versa.

Thanks
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PWSlack
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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.
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#1

Re: Short circuit rating of Breaker:

03/17/2010 8:35 AM

the kA rating is the short circuit current that the breaker will disconnect safely without incurring significant damage.

The MVA rating is the apparent power, or reactive power (see numerous CR4 threads on power factor) that the breaker will withstand continuously without damage.

The two figures are established by testing.

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