• 28/Sept, 2018

The difference between MCB’s and MCCB’s no one told you about

The Invaluable Low Voltage Circuit Breakers and their differences

 The invention of electricity is one of the most influential innovations of our modern world. It set off a series of developments which have since shaped and continue to enhance our lives. With all great inventions, there are benefits and risks as well. The risks while using electric power are many, and potential hazards can be devastating. A short circuit could trigger a fire, damage property and people could lose their lives. As with all dangers, there exists a control mechanism to mitigate or eliminate the risks. One such control device is the circuit breaker, an electrical switch which is self-operating and once it detects a fault, interrupts the current. Just as an automobile seat belt and airbag are safety factors while driving, the circuit breaker is a safety measure when using electric power.

Let us understand the most widely and commonly used circuit breakers the MCB and the MCCB.

MCB and the MCCB are similar, both being low voltage circuit breakers created to meet IEC 947 (International Electrotechnical Commission) standards. It is important to know their distinct differences. One should not be replaced with the other. Each is made for a specific purpose and function. Let us understand their differences so as to optimise their use.

Starting with what they stand for, MCB is Miniature Circuit Breaker, and MCCB is Moulded Case Circuit Breaker. The MCB is the most basic type of circuit breaker mainly used for home wiring or small electronic circuits making them the preferred choice of households. On the other hand, the MCCB is meant for energy-intensive systems and therefore suitable for Commercial and Industrial applications.

The main difference is their capacity, where an MCB can carry a rate of current up to 100 amperes with an operating current range of .5 to 63 amperes. The MCCB can carry a rate of current as high as 2500 amperes with an operating current range of 25 to 630 amperes. While both types are designed with either a thermal or thermo-magnetic trip, the MCCB can additionally possess an electric trip. With an MCB, the trip setting cannot be adjusted.  On the other hand, higher models of MCCB’s come with adjustable trip circuits, giving one far greater flexibility and the best options for high-powered equipment.

The protection offered by an MCB is for over current and short circuits. The MCCB can be additionally designed to respond to earth faults and residual current. Some MCCB units are specially constructed to act as remote-control signals, usually as standby power. There is no possibility for an MCB to be remotely controlled.


If you are one of the few who is still using the erstwhile fuse, it is time to switch to the Miniature Circuit Breaker. Remember, installing circuit breakers is not an option but a basic measure of safety. They should be installed by a professional. Make sure you choose the appropriate MCB or MCCB with the best safety features from a well-reputed company. Check out the Finolex range Here.

Leave a Reply

Your email address will not be published. Required fields are marked *

two × 3 =

Recent Posts

What to look for when buying the pedestal fan for your home

20/ 06, 2019 Pedestal fans are nothing but portable electric fans. They are electrically-powered devices that are used to circulate a cool breeze around your home. The weather in tropical countries like India can get extremely hot and humid, which is why investing a soothing ventilation system such as a pedestal fan can be very […]

Types of telephone cables: All you need to know

20/ 06, 2019 Telephones are an important invention that have the ability to connect people all over the world. They consist of numerous pairs of copper insulated wires having a diameter that ranges from 0.3 to 0.9 and are either twisted into two or four pairs. These pairs of wires are then connected to each […]

All you need to know about Wired Broadband

31/ 05, 2019 It is safe to say that in today’s digital age, wired connections have taken a back seat. They are often synonymous with clutter and inconvenience, creating a mirage of limitations that tend to camouflage their benefits. However, when it comes to the aspect of functionality and security, wired broadband is still remains […]

Key reasons why your air conditioner keeps tripping your circuit breaker

31/ 05, 2019 Summer is at its peak in India, and the last thing you need is your air conditioner switching off and tripping the circuit breaker. If this happens to your air conditioner frequently, you may be wondering how to rectify the situation. Let’s first take a look at the role your AC circuit […]

How to pick the right electrical switches for a small workspace

31/ 05, 2019 There is no doubt that a safe workplace ensures a safe workforce – and the one aspect that plays a big role in safety at work is the use of right electrical switches. This is especially true when you are dealing with a small workspace where the switches are used frequently and […]