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MCB over Fuse
MCB over Fuse
Resources: https://youtu.be/l5Je9xAp9Fo

What is the advantage of the miniature circuit breaker in an electrical system? The advantages of miniature circuit breaker use range from better safety to convenience. We listed the top benefits here for you, but before that, a brief description of the two devices.

MCB and Fuse

A miniature circuit breaker (MCB) is an electrical switch that automatically disconnects a circuit during an overload or short circuit. A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit.

Both MCB and fuse are, therefore designed to protect electrical circuits from damage caused by too much current. So, now that we know what they are, let’s take a look at the advantages of MCB over fuse:

Advantages of Miniature Circuit Breaker over Fuses

Advantages of MCB over fuse
Advantages of MCB over Fuses
Resources: https://youtu.be/2hQ4K4rmM78

Just like fuses, MCBs are designed to protect against fire or explosions. But they have some advantages over fuses that make them a better choice in most cases. The advantages and disadvantages of MCB are discussed below.

Increased Safety

Fuses can pose a fire hazard as they may overheat and start a fire. Miniature circuit breakers, on the other hand, are designed to trip or shut off automatically before overheating occurs. This makes them much safer to use in your home or office.

With the live components encased in a sturdy and insulating plastic housing, miniature circuit breakers are also safer to touch. You are less likely to get an electric shock when working with them.


Another of the big advantages of miniature circuit breaker use over fuses is that they are much easier to reset. Fuses need to be replaced after they have blown. This can be a hassle, particularly if you do not have spares on hand.

With MCBs, all you need to do is switch them off and then back on again. This can be done quickly and easily, without having to replace any parts. Plus, you can reset them many times without affecting their performance.


While miniature circuit breakers and fuses cost different amounts, MCBs are a more cost-effective solution in the long run. This is because you only need to replace them if they are damaged.

With fuses, you need to keep buying new ones every time they blow. In electrical circuits that are prone to overloads or short circuits, this can get expensive.


When an electrical circuit is overloaded, a fuse will blow even if the current flowing through it is only slightly above its rated value and is short-lived. This can be annoying as it may interrupt power to your devices even when there is no real danger to the circuit.

With a miniature circuit breaker, on the other hand, you can choose one with a slightly higher rating than the current flowing through the circuit. This way, it will only trip when there is a real danger of an overload.


There is more variety available with MCBs than with fuses, which is one of the many advantages of miniature circuit breaker use in power systems. You can choose from a wide range of ampere ratings, trip curve characteristics, and sizes to suit your particular needs.

This is not the case with fuses, which are more limited in terms of features. As you can see, there are many advantages of miniature circuit breakers over fuses. For this reason, they are the preferred choice in most applications

Better Interface

Another advantage of miniature circuit breakers is that they offer a better interface. This is because they have a clear and visible on/off switch. With fuses, you need to remove them from the circuit to check if they are blown.

This can be dangerous as you may come into contact with live wires. With an MCB, you can simply look at the switch to see if it is in the on or off position.

Quicker Action

The operation of miniature circuit breaker devices when reacting to an overload is quicker than that of a fuse. This is due to the fact that MCBs have thermal and magnetic elements that can react quickly to an overload.

Fuses, on the other hand, rely on a piece of wire melting in order to break the circuit. This takes time and may not be quick enough to prevent damage to the circuit.

Reduced Arcing

When a circuit is opened, there will be an arc between the contacts. This arc can damage the contacts and cause them to weld together. If this happens, the circuit breaker will need to be replaced.

The modern miniature circuit breaker design includes arc chutes. These help to reduce the amount of arc that is produced when the device opens open a circuit. It helps to extend their life and reduce the need for replacement in addition to increasing safety.


One of the main advantages of miniature circuit breakers is that they can be reused. This is because they can be reset after they have been tripped.

Fuses, on the other hand, need to be replaced after they have blown. This can be costly and inconvenient, especially if the fuse is located in a difficult-to-reach place.

Despite their advantages, miniature circuit breakers do have some disadvantages that you should be aware of before using them. These MCB disadvantages are discussed next.

Disadvantages of Miniature Circuit Breakers

Disadvantages MCB
Disadvantages of MCB
Resources: https://www.redhat.com/architect/circuit-breaker-architecture-pattern

Even though miniature circuit breakers are a better choice than fuses, there are a few things that you should keep in mind before using them. The disadvantages of miniature circuit breakers include the following.


The miniature circuit breaker price is a bit higher than the price of fuses. This is because they are more complex devices. However, while they cost more to purchase, they are more cost-effective in the long run as they do not need to be replaced as often.


The miniature circuit breaker installation process can be a bit more complicated than installing a fuse. This is because you need to connect the wires to the breaker itself. Only a qualified person must, therefore, carry out the installation.


Miniature circuit breakers are larger than fuses. This means that they take up more space in your electrical panel. However, this is not a major problem as most modern homes have plenty of space in their electrical panels.

As you can see, there are both advantages and disadvantages of miniature circuit breakers. You should, therefore, weigh these up before deciding whether or not to use them in your home.

However, miniature circuit breakers are used in place of fuses in many electrical wiring systems from domestic and commercial to industrial power installations.


Miniature circuit breakers (MCBs) are commonly employed in low-voltage systems to protect installations from overloads and short circuits. The advantages of miniature circuit breaker use are many and varied: These devices are a more cost-effective solution than fuses, as they can be reused after they have been tripped. They also offer more accuracy and variety than fuses. However, MCBs are more expensive to purchase than fuses and often require professional installation.

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