Which of the following is the incorrect statement about MCBs?

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The full form of MCB is Miniature Circuit Breaker

MCBs automatically turn off when a very small current flows through a circuit.

MCBs can be used multiple times.

Nowadays MCBs are used in place of electric fuses.

answer is B.

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Detailed Solution

Miniature Circuit Breakers (MCB) are switches which automatically turn off when the current in a circuit exceeds the safe limit and prevent other electrical appliances from damage.
Unlike fuses, MCBs can be used multiple times as we can turn them on to complete the circuit once again.
Hence, nowadays, MCBs are used in place of electric fuses.

Therefore, the incorrect statement is: MCBs automatically turn off when a very small current flows through a circuit.

The correct statement would be: MCBs automatically turn off when a large current flows through a circuit.

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