Which of the following statement about MCB and fuse is correct?

MCB stands for Micro Circuit Breaker.

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MCB can be used only for shortcircuits whereas fuse can be used for both short circuits and overloads.

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Fuse is cheaper than MCB.

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Whenever excessive current flows through the fuse, the conducting material inside it melts down.

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Solution

The correct option is C Fuse is cheaper than MCB.

Whenever excessive current flows through the fuse, the conducting material inside it melts down thereby the circuit breaks.

In the case of MCB (Miniature Circuit Breaker), an electromagnetic mechanism present inside it helps it to instantaneously interrupt the current flow during short circuit/overloading.

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