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What is the Difference Between MCCB & ACB & VCB
Answer Posted / guy
All are breakers
MCB=Miniature CB MCCB=Moulded Case CB ACB=Air CB VCB=Vaccum CB
ELCB=Earth leakage CB RCCB=Residual current CB
Basically a CB is a switch which automatically opens in case of fault (many different faults exist)
The acronyms MCB, MCCB, ACB, VCB are referring to the technology used (i.e. how the breaker is manufactured)
As many others said before me arc breaking technology is different.
MCCB or ACB?
When choosing a breaker at design stage you look at the breaking capacity (kA), the rating, the functionalities of the trip unit (short, long, instantaneous protections, electronic type? yes or no, themal? magnetic? need earth protections? ) The selectivity with others breakers in the network, etc.. This will bring you to choose a ACB or MCCB, the one who will meet your design criterias.
If you want a 400V 5000A for sure no MCCB will be available but ACB will be
For a 1000A both will be.
Note that in some others languages than English there is no difference between MCCB and ACB.
VCB are common on HV (high voltage) but this is wrong wording as well because for instance Schneider VCB use a gas (SF6) and not vacuum.
So take care of the words that are mainly use for commercial purpose.
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