What does the term "kaci" stand for?

What are you trying to measure?

Can you give me some more information to work with, please?

See if this helps:
http://www.bussmann.com/library/docs/EPR_Booklet.pdf

KAIC - What does KAIC stand for? Acronyms and abbreviations by the Free Online Dictionary.

Unless you are an engineer, or are manufacturing panels or breakers I don't why this would matter to you.
And if you were an engineer you would not be asking this.

WHY are you asking this?

Strat,

Thanks, I don't know why I did not remember Short Circuit Current Interrupting acronyms.

So we would still need to know for which type breaker is the poster trying to size (Main Service Breaker or Branch Circuit Breaker)

But as Stan points out, this is more of a engineering design or specifications question.