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Answer Posted / mohammed yousuf khan
ACB stands for Air Circuit Breaker whereas MCCB stands for Moulded Case Circuit Breaker. Generally MCCBs are used for loads upto 630A but if the load is higher say beyond 630A then the ACBs are used.
1)Also ACB is long lasting when compared to MCCB.
2)The switching contacts of ACB operate in air, whereas the switching contacts of MCCB operate in a case. Hence the name ACB & MCCB.
3)Apart from Overload, Short Circuit & Earth fault protection, other protections such as Under voltage protection can be achieved using ACB.
4)MCCBs are very compact, whereas ACBs are large in size when compared to MCCBs.
5)MCCBs needs to be replaced after a certain operations but ACBs can be re-used with little maintenance, as the spares are easily available for ACBs such as Contacts,arc chute etc...
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