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Q.

How many types of Miniature Circuit Breakers are there?

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a

6

b

3

c

4

d

5

answer is D.

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Detailed Solution

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  • There are six different kinds of MCBs namely A, B, C, D, K and Z. 
  • These are classified into different types based on their tripping characteristics which are the range of tripping fault current at which the device operates in the event of a short circuit or overload.
  • For example, type A MCB trips instantaneously when the current exceeds 2 to 3 times its rated current value whereas type B MCB trips when the current is 3 to 5 times the rated current with an operating time of 0.04 to 13 Seconds.

Therefore, '6' is the correct answer.

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