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What is the Difference Between MCCB & ACB & VCB
Answer Posted / d.emerson dhansingh
Answers 1-10 except perhaps,9 are true in parts but do not provide a complete answer to the question.
All three of them are meant for making or breaking an electrical circuit under normal and abnormal (fault) conditions, unlike switches and isolators which are not designed to withstand fault currents
All of them have different short circuit interrupting capacity, MCCB being the least(upto 85 KA)followed by ACB (upto 125 KA) and VCB (>125 KA). They are selected for use in an Electrical circuit as decided by the max.fault levels
that are possible at the point where they are used.
All of them can be mechanically or electrically switched "on" and "off" and they can be automatically tripped on fault conditions.
All of them can be provided with Adjustable "Thermal" and "Magnetic" trips for protecting the circuits against "Overload" and "Short Circuit"
The method and medium of arc quenching used in these breakers differ from each other.
Of all the three breakers, VCB is more popular and preferred over others in HT (largely) and LT for the following reasons.
1. VCBs can easily be called as "zero maintenance" breakers
2. For the same current rating, VCBs are smaller in size.
3. It is "eco-friendly" in operation.
4. The contact wear is minimal and that results in longer operating life
The capital cost in installing VCBs are the highest but the operating and maintenance costs are the lowest.
The above are only the most important features of these breakers but there are many constructional differences as well.
D E Dhansingh
Electro Technical Officers Programme
Ethiopian Maritime Academy
Bahir Dar University, ETHIOPIA
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