Question

State one advantage of using an MCB.

Hint:

MCBs are also generally more sensitive to current fluctuations and act faster than traditional wire fuses.

Answer 1

Step 1: Understanding the Concept:
MCB stands for Miniature Circuit Breaker.
It serves the same primary safety purpose as a fuse but with different mechanics.

Step 2: Detailed Explanation:
When an overload or short circuit occurs, a traditional fuse wire melts and gets destroyed to break the circuit.
You have to physically find and install a new fuse wire to restore power.
An MCB, however, uses an electromechanical mechanism to simply trip a switch when fault current is detected.
Once the fault is resolved, power can be restored instantly simply by flipping the switch back to the 'ON' position.

Step 3: Final Answer:
The main advantage is its reusability; it can be quickly reset after a fault without needing replacement.