Question

Why is MCB used?

Answer 1

MCB (Miniature Circuit Breaker) is used to protect electrical circuits from damage caused by overcurrent, which can happen due to short circuits or overloads. It automatically switches off the circuit when the current flowing through it exceeds the safe limit.

Here’s why MCBs are important:

1. **Overload Protection**: When too many devices are connected or if there’s a fault causing too much current, the MCB will trip (turn off the circuit) to prevent wires from overheating, which could otherwise lead to fire or equipment damage.
   
2. **Short Circuit Protection**: In case of a short circuit, where the current suddenly spikes to a dangerous level, the MCB trips instantly to protect the system.

3. **Safety**: MCBs are safer than fuses because they can be reset after tripping. A fuse, once blown, needs to be replaced. So MCBs save time and effort while ensuring ongoing protection.

4. **Convenience**: MCBs are easy to reset. Unlike fuses, which require replacement, you can simply switch the MCB back on once the issue is resolved.

Overall, MCBs provide an efficient and reliable way to protect both people and equipment from electrical hazards.