How to Choose a Circuit Breaker: MCB vs. RCCB

When working with electric circuits and appliances, there are usually two options, MCB and RCCB. 

They have similar purposes, but the question arises, what is the difference between MCB and RCCB? So, read on to know more in detail about these two circuit breakers. 

What Is An MCB? 

MCB stands for Miniature Circuit Breaker, which provides protection essential for reliability and safety if dealing with electric appliances. 

Definition And Function Of An MCB 

The miniature circuit breaker is a modular device that can isolate the circuit if there is a short circuit or overload. MCB can sense if there is an extremely high current, then it trips immediately to avoid any circuit damage. MCBs are best suited for commercial and residential applications. 

Types Of MCBs

Different MCB types are available such as A, B, C, D, K, and Z. But, three versions, type B, C, and D, are the key. Each type is designed to be responsive to different electric surges.

• Type B MCB

If the current flowing hits 3 to 5 times the recommended load, then the type B trips. 

• Type C MCB

Type C circuit breakers are perfect for more powerful electric surges. 

• Type D MCB

Type D circuit breakers only activate when the current surges between 10 and 20 times the recommended maximum.

Advantages And Disadvantages Of MCB

MCB works as a better alternative than the fuse. One issue with using fuse is that they must be replaced once operated. However, MCB, such as a mini circuit breaker, is an automatic switch, so it opens when there is an overflow of current and closes when the circuit returns to normal. 

There are advantages and disadvantages of MCBs: 

Advantages Of MCBs:

• They are more sensitive to current as compared to fuse
• MCBs work quickly when there is a high current flow
• It is easy to resume the power supply
• MCBs are reusable, which means the replacement and maintenance cost is less 
• It has a better interface
• It is easy to identify the faulty zone of the electric circuit 

Disadvantages of MCBs:

• MCB can be costly when compared to fuse

What Is An RCCB?

RCCB stands for Residual Current Circuit Breaker. Although, according to the definition, one might not find the difference between MCB and RCCB; however, they are not the same. But before going into that, it is vital to understand RCCB. 

Definition And Function Of An Rccb 

RCCB is also referred to as RCB or RCD circuit breaker. RCCB is a residual current protective device that monitors the electric current in commercial and residential buildings’ neutral and main lines. It is one of the safest devices to detect and trip against electrical leakage currents and prevent potential electric fires. 

This circuit breaker works quickly and it only takes around 20 milliseconds to trip.

Types of RCCBs

There are two types of RCCBs:

• 2 Pole RCCB

It works in a single-phase supply that only consists of a live wire and a neutral wire. 

• 4 Pole RCCB

This RCCB is used in a 3-phase supply connection that consists of 3-phase wires and a neutral wire. 

Advantages And Disadvantages Of Rccbs

RCCB is a crucial safety component when protecting the electric circuit. The main purpose of RCCB is to protect the individual from electric shock and electrocution. Below are some of its advantages and disadvantages: 

Advantages of RCCB

• It is impactful against earth faults and residual current
• As soon as the rate sensitivity of the circuit surpasses, RCCB gets disconnected 
• It also guards against circuit variations 

Disadvantages of RCCB

• It might not always be successful in detecting over-current faults and short circuits

The Top 6 Key Differences: MCB vs. RCCB

To understand better MCB vs RCCB, it is best first to understand their differences. Below are the top 6 RCCB and MCB differences:

Function

The primary MCB and RCCB difference is that RCCB prevents earth leakage, whereas MCB prevents short circuits and provides overload protection. 

Sensitivity

Regarding insensitivity, RCCB is insensitive to short circuits and overloads, and MCB is insensitive to electric shocks.

Tripping Time

As compared to RCCBs, MCBs are not sensitive to currency fluctuations. It can take up to a relatively long time before tripping. However, RCCB can trip within 20 milliseconds and is very sensitive. 

Current Rating

Regarding RCCB vs. MCB, current ratings play a crucial role. RCCB has current ratings of 300mA, 100mA, 30mA, and 10mA. MCBs have current trip sensitivities 6A to 125A. 

Installation

MCB is easy to install than RCCB. MCB has a simple power switch that connects to the main circuit easily. However, the difference between MCB and RCCB is that RCCB has a built-in earth leakage system, so its installation is complicated. 

Price

Comparing the prices, MCCBs are less expensive than RCCBs. RCCB is costly because it comes with additional protective features. 

BENY’s MCB And RCCB Products 

Our circuit breakers are cost-effective and are of high quality. Since our manufacturing facility has ten automated productions, you can get efficient and fast production. 

Introduction To BENY

We are a reliable and quality PV protection products and EV charger manufacturer. We have experience working in the electric industry for the past thirty years. So, we know the rules and regulations and comply with the latest standards. We put our focus on solar DC protection design, manufacturing, and marketing, and we provide brand-building solutions.

Brief Description Of Beny’s Mcb And Rccb Products

Our circuit breaker products have three ranges: Molded case circuit breaker, a BESS DC breaker, and a Mini circuit breaker. Other products are DC surge protective devices, DC isolator switches, etc. Our circuit breaker ensures that the solar systems are safe. We take care of everything from design to material selection to production and inspection. 

Conclusion 

Summing up, MCB and RCCB play crucial roles in ensuring electric appliance safety. And although both function the same way, there is a notable RCCB and MCB difference, as mentioned above. 

You can contact us if you are looking for attractive offers to protect solar photovoltaic, commercial battery storage, EV charging, etc.