Question

What is/are the advantages of MCB over fuses?
A. Its wire melts unlike fuse’s wire
B. It automatically turn off to save from excess electricity
C. It takes less time to break the circuit compared to fuse while overloading
D. None of these

Answer 1

Hint:We know that fuse and MCB are one of the important components of an electrical system. While both circuit breakers and fuse perform the same function that is to prevent overloads. Fuse as well as MCB are used for interrupting the flow of electricity. We need to understand how both work.

Complete answer:
We know that the fuse is an electrical safety device that removes electrical current from an electrical circuit when the current in the electrical circuit is too high.On the other hand, MCB is an automatically operated electrical switch which is designed to protect an electrical circuit from damage caused by an excess amount of current from an overload or short circuit. The basic function of MCB is to interrupt current flow after a fault is detected.

Fuse is normally used in electronic equipment that requires very low current while the MCB is used in heavy machines or electronic equipment that requires a large amount of current.The main difference between fuse and MCB is that fuse is a metal piece which melts when there is overload while MCB has an internal switch which gets tripped when the amount of electricity flowing through is way too much. Thus, MCB works quicker than fuse.

Hence, option B and C are the right answers.

Note:There are some other advantages of MCB over fuse. For example, A fuse can be used only once whereas MCB can be used multiple times. Moreover, with MCB it is very simple to resume the supply. we just need to push the knob of MCB back to on position. But in case of the fuse, the entire fuse wire needs to be replaced.