Question

What is/are the advantage of MCB over fuses?

• A. Its wire melts unlike fuses wire
• B. It automatically turn off to save from excess electricity
• C. It takes less time to break the circuit as compare to fuse while overloading
• D. None of these

Answer 1

Answer: (B), (C)

It automatically turn off to save from excess electricity
It takes less time to break the circuit as compare to fuse while overloading

MCB has several advantages over fuse:

1. MCB is more sensitive to current than the fuse. It detects any abnormality in the current flow and automatically switches off the electrical circuit.
   
2. In the case of MCB, the fault zone of the electrical circuit can be easily identified. Faulty circuit trips to the off position. On the other hand in case of the fuse, the complete fuse wire needs to be checked by opening fuse grip for confirming the fault zone.
   
3. With MCB it is very simple to resume to the supply. You 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.
   
4. MCB provides a better interface with the help of knob than a fuse. In case of the fuse, the compete for handle needs to be taken care out.
   
5. Handling MCB is electrically safer than handling a fuse.
   
6. MCB is reusable and hence has less maintenance and replacement cost. Whereas a fuse needs to be replaced whenever it goes faulty.