• 27 /July, 2018

5 Advantages of MCB over Fuse!

Are you aware that your electrical equipment can be potentially destroyed/ damaged by overloads, in some cases, may cause even a fire! In order to protect your equipment from overload, a Fuse or MCB is used. Suppose, there is an overload in an electrical circuit, what a Fuse and an MCB do is they break the flow of electricity causing the circuit to break.

This article contains information about how a Fuse and an MCB work and why should we prefer MCB over Fuse.


What is a Fuse?

In electronics and electrical circuit, a fuse is an electrical safety device that operates to provide overcurrent protection to an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the current. It is a sacrificial device; once a fuse has operated, it is an open circuit, and it must be replaced or rewired, depending on the type.


What is an MCB?

Miniature Circuit Breakers (MCBs) are electromechanical devices which are used to protect an electrical circuit from an overcurrent. The lead reasons for an overcurrent could be a short circuit or overload. Unlike a Fuse, MCB does not have to be replaced every time after a fault occurs and it can be reused.

Also, there is an improved operational safety without incurring any large operating cost.


Why use MCB instead of a Fuse?


MCB has several advantages over the Fuse:

1. MCB is more sensitive to current than Fuse

It detects any abnormality in the current flow and automatically switches off the electrical circuit.

2. In case of MCB, the faulty zone of electrical circuit can be easily identified

Faulty circuit trips to the Off position. On the other hand, in case of a Fuse, the complete fuse wire needs to be checked by opening the fuse grip for confirming the faulty zone.

3. With MCB, it is very simple to resume the supply

You just need to push the knob of MCB back to the On position. But in case of a fuse, the entire fuse wire needs to be replaced.

4. Handling MCB is electrically safer than handling a Fuse. In case of MCB

In case of an MCB, the user is not exposed to live electrical parts; but while replacing the Fuse, there is a fair chance that you may come in contact with a live wire / current carrying conductor.

5. MCB is reusable and hence has less maintenance and replacement cost

Whereas a fuse needs to be replaced whenever it goes faulty.

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