Fuse or MCB Which one in better ?

[vensorelectricals]

A Fuse or an MCB is a safety device. It is nothing but an electrical switch which opens the circuit and thereby protects the equipment from being damaged or destroyed in case there is an overload of current. This article contains information about how a Fuse and an MCB work and why an MCB is better than a Fuse in protecting a circuit.

 

What is a Fuse?

 

Fuses are electrical safety devices that protect electrical equipment from excess current. Fuses are devices that contain a wire or strip made from a metal that melts at a certain, preset temperature, thereby interrupting current flow through the circuit.

 

What is an MCB?

 

A Miniature Circuit Breaker (MCB) is a device used for the protection of electrical circuits from overcurrent or overload conditions. The reason why MCBs are more popular than other protection devices is that they connect and disconnect the supply voltages automatically. There is no need for external control circuitry or manual intervention.

 

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MCB has a lot of advantages over the Fuse:

 

1. Comparing the two, MCB is more sensitive to current than Fuse.

 

2. In the case of MCB, the faulty zone of the electrical circuit can be easily identified. The MCBs can be easily replaced but this is not possible in the case of Fuses.

 

3. For the times when the circuit breaker may not work, the knob of the MCB can be pushed back to the on position. But for a Fuse, it is not possible as the entire wire needs to be replaced.

 

4. In the case of MCBs, the user is not exposed to live electrical parts; but while replacing the Fuse, you may come in contact with a live wire. It is electrically safer to use MCB than Fuse.

 

5. MCBs have minimal maintenance costs. Whereas, for fuses, there is a maintenance cost involved in replacing fuses after they are burnt out.