Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning, circuit breakers and fuses and ACB short ciruit breaking capacities, is answered by ABB:
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| An ABB ACB....what's the SC breaking capacity? |
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Question: What are the standard short circuit breaking capacities of air circuit breakers ( ACBs)? I am using Amtech software for some of my calculations, but in the Amtech library, values for ACBs below 50KA are not given.
Answer: ACBs generally have very high short circuit breaking capacities because of the fact that they have high current ratings and are used very close to the source of the low voltage supply where the prospective fault level is at its highest.
The UK normally requires a minimum short circuit capacity of 50kA at 400V for ACBs, but ABB can offer lower versions - such as our X1B, E1B and E2B devices, which have a breaking capacity of 42kA. I have attached a link to the technical catalogues for Emax and X1 ACBs to show ABB's full range (please note - if these links don't work by clicking below, copy and paste them into your browser):
http://library.abb.com/global/scot/scot209.nsf/veritydisplay/9e247ab653196a46c12572290057e7c5/$File/1SDC200006D0204.pdf
http://library.abb.com/global/scot/scot209.nsf/veritydisplay/2e698163e414e3e6c12572c2002e3f4a/$File/1SDC200009D0202.pdf
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: http://www.voltimum.co.uk/consult.php?universe=consult.index.questions
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