Question

What is MCB? Why is MCB preferred to an electric fuse?

Answer 1

Hint: In order to answer this question, we must know that MCB senses the excess current flow and breaks the circuit by switching off immediately.

Complete step-by-step answer:
MCB stands for miniature circuit breaker. A MCB is an electrical switch that is automatically controlled to protect an electrical circuit from damage caused by excess current from overload or short circuiting. The central function is to interrupt current flow until a fault has been found.
MCB’s are not typically lost during over-current, and they can be reused. These are also much simpler to use, providing the ease of 'on/off switching' for insulating the circuit and as the conductor is housed in a plastic shell. They are much easier to use and to run.
On the other hand, a fuse is an electrical safety device that serves to provide an electrical circuit with overcurrent protection. The main part is a metal wire or strip that flows through it when too much current flows, thereby stopping or interrupting the current.
MCB is more preferable to electrical fuse because the metal wire melts in an electrical fuse and fuse gets destroyed when excess current flows through it so in MCB it is immediately turned off when excess current flows through it and the supply can be restored simply by switching the MCB on again.

Note: Whenever we ask these kinds of questions, we must first know the basic concept of the terms given in the question. We will then compare both on the fundamentals of their job or on any other parameters. Then we can get the answer with ease. This is the theory based problem so we should have a good grasp of theoretical concepts to solve.