Which of the following statements is not true about an electric fuse?

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The automatic fuse is called MCB (Miniature Circuit Breaker).

When an excess current is passed through an electric fuse, it closes the electric circuit.

The electric circuit breaks due to overheating and melting of fuse wire.

A traditional fuse once broken, needs to be replaced by a new one.

answer is D.

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Detailed Solution

A fuse is a very thin safety piece of wire that will melt and break the circuit when a large electric current flows through it.
A traditional fuse consists of a wire that is made up of a special material than can melt quickly when a large current is passed through it. Since the wire melts down, it needs to be replaced by a new one.
Whereas, MCB (Miniature Circuit Breaker) is a switch which automatically turns off when the electric current in the circuit exceeds the safe limit. It can be turned on again to complete the circuit.
When an excess current is passed through an electric fuse, it melts and opens the electric circuit.

Therefore, 'When an excess current is passed through an electric fuse, it closes the electric circuit.' is the incorrect statement.

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