Month: May 2023

How to Choose the Right RCCB: Learn the Details

When you have electrical circuits at your home, office or other places, current leakage hazards can occur anytime. Such hazards may be fatal sometimes. Hence, it is important to protect the circuits beforehand.

RCCB is a useful safety measure for this purpose. It is installed with MCBs in many places like homes, tunnels, construction sites, welding machines, etc.

But there is one thing to note. Buying the right RCCB is important to avoid the hazards. In this article, we will talk about it in detail.

First, we will talk about what RCCB is. Then, we will discuss selecting the right RCCB and the difference between RCCB and RCBO. A checklist to identify the reasons for RCCB tripping will be at the end.

What is RCCB?

RCCB, or Residual-Current Circuit Breaker, is a safety measure that protects electric circuits from getting damaged due to earth faults or wiring problems.   

They are installed parallel to the MCBs inside a distribution board. The MCB protects against overload and short circuits, and the RCCB protects against earth leakage.  

If any fault is found or the current exceeds the rated sensitivity, RCCB senses it. Then, it disconnects the circuit. Thus, it protects from a shock caused by direct contact.

RCCB vs. RCBO: Learn the Differences  

Many times, people get confused between RCCB and RCBO.

RCCB is, as we mentioned, an electrical wiring safety device that disconnects the circuit when it senses a current leakage to the earth wire.

RCBO or Residual Current Breaker with Over-current, combines the functionality of both MCB (Miniature Circuit Breaker) and RCCB. When a current leakage takes place, the RCBO trips the whole circuit.

An RCCB can protect against electric shocks and earth faults. As a combination of MCB and RCCB, RCBOs can protect against overload and short-circuit problems.

So, while buying an RCCB, keep the differences in mind to avoid any hassle.

How to Choose the Right RCCB: Different Applications Explained:   

Depending on where you're using the circuits, you need to choose the right RCCB.

Let's know more about it.

In places with great risk of electrical shock: Bathrooms, swimming pools, tunnels, etc. are the places with a huge risk of electrical shock. So, high-sensitivity, fast RCCB should be used here. Its sensitivity should not be more than 10 mA.  

In motors: In these cases, an RCCB should be able to avoid the starting leakage current of the motor without action. It is often up to 15 mA for a 100 kW motor. The RCCB should have better balance features to avoid the rated sensitivity of the stall current during a malfunction.  

In welding machines: For short-term impact welding current, you can use an RCCB with normal operational abilities. But, for a high-frequency welding machine, you may need an RCCB with a standard anti-electromagnetic interference performance feature. On average, 9-30 mA is an ideal rating for RCCBs in welding machines.

In construction sites: Metal structures and electrical tools are present here with a high risk of shock. So, on these sites, you should use mobile or portable devices with high-sensitivity RCCB. The ideal rating for RCCBs used on these sites is 100 mA.

In lighting lines: If you plan to buy RCCB for the circuits in lighting lines, you should note a point. It must be based on the size and distribution of the leakage current across the lines. A 10 mA or 5-6 mA RCCB is enough to protect the lighting circuits.

In residential areas: Mostly, 30-100mA is the normal range for RCCB for household needs. 30 mA is quite sensitive and can cause a few tripping without any visible fault.     

Usually, 60 mA and 100 mA are installed in most houses to ensure a balance between no obvious fault and actual fault.   

So, determine your purpose first and buy the right RCCB. Also, don't forget to take expert advice to select the rating of the RCCBs.

Checklist on Identifying the Reason for RCCB Tripping:  

Anyways, apart from finding the right RCCB, another issue that people face is an inability to find out the reasons for RCCB tripping. We will discuss here how to identify these reasons.

When you find tripping, ask these questions to yourself and act based on your answers:

A. Do you have made any changes in the system, e.g. installing new sockets or lights?

If any change has been made, the reason for tripping might be a loose terminal or wiring fault.

B. Was weather a concern?

A lightning strike can produce high-surge currents, which can trip the switches. Heavy rainfall and damp walls may also cause damage to the circuits leading to tripping.

C. Have the wires been damaged in any way, e.g., during furniture shifting or renovation?

If any cable is damaged already, tripping can occur easily. Check it carefully. Well, such incidents may include crucial fire hazards. Beware of that!

D. Is there any discolouration around your outlet?  

The discolouration hints at the possibility of a ground fault surge. It is an issue similar to a short circuit. In such cases, a hot wire touches a ground wire. This makes more electricity pass through it, which the circuit cannot manage.

E. Have you checked the fault's location?

You can do it by switching off individual circuits through relevant MCBs. If you see all circuits working except one, the fault lies there only.

Wrapping it Up

As a final thought, we must say that choosing the right RCCB is a difficult task. But, with the suggestions we mentioned above, it can be easier. As it is an efficient protective measure, you must get the right RCCB to keep the circuits safe for years. So, buckle up and buy it today. Looking for high-quality RCCB in India for your electric circuits? Visit L&T-SuFin now.

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by L&T SuFin

RCCB or Residual Current Circuit Breaker: An Overview

It is not uncommon these days to hear about MCB, RCB or RCCB. Whether you are a homeowner or an industrialist, you must have heard about it. Now, you will learn more about it as this article discusses in detail the mechanism of an RCCB, the different types of RCCBs, and their benefits and limitations as well.

What is an RCCB?

An RCCB (Residual Current Circuit Breaker) is a type of circuit breaker that is used to protect against electrical shocks. It is designed to break the circuit when there is a leakage in the current flowing through the circuit. This difference can be caused by a fault in the circuit or by a person touching a live wire. Upon sensing residual current, the RCCB trips the circuit.  

Various Types of RCCB

The Residual Current Circuit Breaker, or RCCB, can be classified into 3 types based on the source used.

. Based on the number of poles, RCCBs are of two types- 2-pole and 4-pole. While first one works in single-phase connections, and the latter one is for three-phase connections.  

How RCCB Helps?

It is said that human beings can withstand a shock of up to 30 mA. But, when it goes beyond 10 mA due to the uneven flow of current in two wires inside a circuit, the prickling sensation of shock turns into major impacts like muscular contraction, breathing trouble, and so on.

RCCBs are designed to recognise even a minor change in residual current. When it senses the change, it disconnects the circuit and saves you from the major impacts of a shock.

The Benefits of Using an RCCB:

The major benefits of RCCBs are as follows:

• An RCCB protects against earthing faults.
• It also protects against any other sort of leakage of current.
• It breaks the circuits automatically when sensitivity exceeds what is rated.
• With the help of the filtering device inside it, an RCCB protects against voltage fluctuation.
• It makes dual termination for cable and busbar connections possible.

Overall, RCCB aims at protecting individuals from the fatal impacts of electric shock by recognising residual current due to a fault in the circuit.

Are There Any Drawbacks?

While there are multiple benefits, there are certain limitations, too, with RCCBSs. Let's see what they are.

• RCCBs cannot protect against overheating, which strikes if conductors into terminals are not properly screwed.
• It cannot protect against line-neutral shocks as it has a balanced current in them.
• An RCCB cannot detect a current overload.
• Unwanted tripping may occur if you choose an incorrect or very low sensitivity-rated RCCB. Sometimes, a sudden change in loads and a current flow resulting from it lead to tripping.  
• As it is designed to operate on normal supply waveforms, it may not operate if the loads generate non-standard waveforms.

How to Select the Right RCCB for Your Application   

Not all RCCBs are suitable for your application. To ensure the desired result, you must choose the right RCCB.

First of all, you should focus on selecting the right ratings.

Usually, for household requirements, 30-100mA is normal. However, 30 mA is quite sensitive and can cause tripping issues without any visible fault. 60mA and 100mA are ideal for your house. They create a balance between no obvious fault and actual fault.

In construction sites, you should use portable devices with high-sensitivity RCCB. 100 mA is the ideal rating for RCCBs used on these sites. It is best to discuss with an expert to learn more about the ideal rating.

Also, you should note another factor. You may get confused between RCCB and RCBO.

RCCB is a circuit breaker device that disconnects the circuit when it senses a current leakage to the earth wire.

RCBO, or Residual Current Breaker with Over-current, includes the functionality of MCB (Miniature Circuit Breaker) and RCCB. When a current leakage appears, it trips the whole circuit.

Above all, you must choose the right place to buy the RCCB, where a wide range of variations is available. Otherwise, you may buy a faulty piece or an RCCB with an incorrect rating.

To Sum Up  

An RCCB, with all its benefits, is an important component to be added to electrical circuits. Whether domestic appliances or industrial equipment, residual current circuit breakers can protect them from damage and save you from electrical shocks.

By reading the blog, you should be able to identify the need for an RCCB. Also, you learned how to select the right RCCB and where to find the desired one. Anyways, if you plan to buy it for your home or office, L&T-SuFin offers an array of high-quality RCCBs. Check out the site and opt for your preferred one today!

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by L&T SuFin

Learn Why You Should Install RCCB at Home in 2023

Did you see your neighbour installing an RCCB and feel you should also have it in your home? But, probably, not knowing about it restricts your action!

Using only MCB has been common for years. Now, RCCB is often installed parallel to the MCB inside the distribution board. It seems to be popular as a circuit breaker. So, a question may come to your mind.  

Is RCCB a replacement for MCB? Or does it need to be placed with an MCB?

Do not worry! You will get the answers to your questions in this article. You will first learn about the benefits of installing an RCCB. Further, you will also learn about different ratings of RCCB. Also, we will shed light on what needs to be done when an RCCB tripping takes place.

The Major Benefits of RCCB

RCCB, or Residual Current Circuit Breaker, disconnects the circuit when it senses any fault or finds sensitivity exceeding the rated measurement. But how does it benefit you?

• Offers protection against voltage fluctuation:

Sometimes, a temporary unwanted voltage surge in an electrical circuit takes place. It may range from a few to several thousand volts and last from microseconds to milliseconds. RCCB comes with a filtering device inside it which enables it to protect against such voltage fluctuation.

• Can recognise uneven current flow in a circuit:

Usually, in a circuit, an equal level of current flows from the live wire and neutral wire. If any fault occurs, it reduces the current flow from the neutral wire. Whether a two-pole or a four-pole RCCB, it can sense this uneven current flow in a circuit. Then, it disconnects the circuit to prevent a heavy impact.

• Disconnects circuits once rated sensitivity is breached:  

For residential appliances, a sensitivity of less than 10 mA is recommended. If an electric shock is more than 10 mA, it can cause fatal consequences to human beings. Sudden earth faults, fire hazards, and other electrocution cases may result in high-sensitivity electric shocks.

Installing an RCCB of 63-100 mA can save you from them. It reduces the impact of the shocks from the contact with the faulty areas by disconnecting the circuits once rated security is breached.

• Protects appliances from damage:

Frequent electrical hazards can damage the appliances at home and office. That is why you need an RCCB. It senses the exceeded sensitivity or faults in a circuit easily and breaks it before any mishap happens with the appliances.

• Prevents the impacts of earth leakage:

ELCB or Earth Leakage Circuit Breaker can also prevent earth leakage. But, it has certain limitations like mandatory continuity of earth, specific wiring arrangements, etc.

RCCB protects against earth leakage without any such drawbacks. Even if the earthing continuity is unavailable, an RCCB will trip the circuit breaker. Unlike ELCB, no separate it does not require earthing of different devices.

The Suitable Ratings of RCCB for your Home

Now, you have understood the benefits of an RCCB so far. If you have decided to install it in your home, here are more details to help you.

32-63A rated RCCB is an ideal option for your home. It can work well for the leakage of up to 30-100 mA. Anyways, 30 mA is very sensitive, which may cause a few tripping without any visible fault. You can opt for 60 mA and 100 mA. They provide a balance between no obvious fault and real fault.

What To Do When an RCCB Tripping Occurs?   

Your task is not over after installing the RCCB. You must be prepared to troubleshoot the tripping whenever required.

If you find repeated tripping at home, it means it has faults. They might not be the regular MCB tripping. Kitchen appliances like mixers, plugs, sockets, geysers, etc., can be a reason for tripping.

There are various possible reasons for these regular trippings. They include faulty appliances, moisture in electric sockets, incorrect RCCB ratings used, etc.

So, first, isolate the MCB of the kitchen and then reset RCCB. If it works, unplug all appliances and re-connect them later on.

If it is not the case in the kitchen, try all MCBs one by one. Plug and unplug all appliances. Eventually, you will find out defective appliances as you can see some faulty circuits not working well, while others will work well.

If the problem is in appliances, you should replace them with good ones. If it is a moisture issue, clean and dry the area with proper protection. And if it is a problem of incorrect rating, take time to find the RCCB with the right sensitivity.

Once you find where the problem lies, take no time to resolve it. If you cannot reset the RCCB or resolve the problem, hurry up and call a reliable electrician to do the job for you.

Before You Go

It seems that your doubts are clear now. And you are looking ahead to buy an RCCB for your home. A wise decision indeed! It will protect you and your house in many ways. With proven benefits, it can save you from major electrical hazards. Make sure to buy RCCBs with the right ratings. Consult with an expert if needed. However, another critical point that needs to be borne in mind is that if the RCCB is not of high quality, it may be useless. Therefore, L&T-SuFin has brought you a wide collection of efficient RCCBs that are ideal for your house. So, check out this site and make the right RCCB choice today!

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by L&T SuFin

MCB vs RCCB: Understanding the Key Distinctions

We all have come across situations where there is a power trip at home or work, and we are continuously thinking about what caused it. Well, it could be MCB and RCCB doing their job. MCBs and RCCBs are like two security guards for our home's electrical systems. Their primary role is to keep our homes safe when there is an overload or leakage, protecting us against hazards. Now, you must be thinking, if both MCB and RCCB serve the same purpose, what is the difference? This blog is going to provide you with that clarity. Read on to find out the differences between RCCB vs MCB, as well as their functioning and uses.

Top Differences Between MCB and RCCB

Before we start with the RCCB MCB differences, let us know what MCBs and RCCBs are.

MCB

An MCB or a miniature circuit breaker is a safety device. Its primary function is to prevent the electrical system from being damaged in the event of any overload or short circuit. In simple words, whenever a short circuit happens, the MCB  will quickly turn off the power supply to prevent any further damage from happening.

MCBs are used in both residential and workplace settings. They are typically used to protect several circuits at once, with each circuit possessing its breaker. 

RCCBs

RCCB, also known as RCD or Residual Current Circuit breaker, is a residual current protection device that monitors current in the main and neutral lines of both residential and commercial buildings. 

Let us understand it with an example:

If an appliance has a faulty wire that leaks current, an RCCB will immediately disconnect the power so that no further damage is caused. Furthermore, this safety device ensures that no electrical shocks occur in places like bathrooms and kitchens that use water.

Installation

One key aspect of the difference between RCCB and MCB is installation. MCBs are comparatively easier to install as they come with a simple power switch that can be connected to the main circuit. On the other hand, RCCBs require more precision when being installed.

Protection

The design of MCBs makes them useful for providing protection against short circuits and overloads. RCCBs are designed to protect electrical systems against earth leakages and electrical shocks.

Sensitivity

In terms of sensitivity, RCCBs rank higher as MCBs are not that sensitive to current fluctuations and can take a few milliseconds to trip. RCCBs react faster and trip within 20 milliseconds.

Number of Poles

You can find MCBs in single, double and four pole systems, whereas RCCBs have only double and four pole systems.

Rating

MCBs have a rating between 6A and 125A, whereas RCCBs have a rated current trip sensitivity of 300mA, 100mA and 10mA.  

RCCB vs MCB: Additional Differences

Some other important  MCB and RCCB differences are as follows:

Feature	MCB	RCCB
Fault Detection	Detects overcurrent and short circuits.	Detects leakage currents due to insulation failures or ground faults.
Neutral Connection	Works with or without a neutral wire.	Requires both phase and neutral connections for proper operation.
Primary Use Case	Commonly used in household and industrial distribution panels for overload protection.	Used in residential and commercial setups to prevent electric shocks and fire hazards.
Tripping Mechanism	Trips based on thermal and magnetic effects.	Trips occur when there is an imbalance in incoming and outgoing currents.
Resetting After Trip	It can be easily reset by flipping the switch back.	Manual inspection is needed before resetting to ensure safety.

Summing Up

Understanding the differences between MCB and RCCB is essential in order to effectively protect your home against electrical hazards like short circuits and overloads. Here is a little tip to ensure both devices work smoothly:

Make sure you install MCB before RCCB!

Now that you know all the differences between RCCB and MCB, make a smart choice by choosing the one that fits your needs. Buy and install MCB and RCCB now to protect your electric circuits from any damage. Explore our range to check out some excellent choices on offer.

FAQs

Can we use RCCB without MCB?

Although RCCB protects against electrical shocks, it is always best to use MCBs and RCCBs together. This ensures better protection against possible electrical dangers.

Can I use RCCB at home?

Absolutely, you can use RCCBs at home. RCCB is best suited for electrical systems in places that are wet, like kitchens and bathrooms.

Does RCCB trip on overload?

No. RCCBs are designed to trip on leakage and not on overloads.

RCCB vs MCB: Which is better?

While both serve the purpose, MCBs are preferred because they are comparatively easier to install than RCCBs.

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RCCB Types: Which One is Right for Your Electrical Safety?

urrent leakage threats can arise anywhere in your house, business, or other locations where you have electrical connections. Sometimes these threats could be quite dangerous. Thus, it is advisable to safeguard the circuits.

For this purpose, RCCB is a helpful safety precaution. It can be set up in any location, including residences, tunnels, building sites, welding machines, etc.. It measures the current and cuts the circuit in case a fault develops. 

Learn about the different types of RCCB to choose the right one! 

Types of RCCB by Number of Poles

RCCBs are categorised in many different ways, one of which is the categorisation by the number of poles. In this way, there are two types of RCCBs:

Single Pole RCCB

This type of RCCB is generally found in residential homes. It is used for single-phase connections, as the name suggests, and is best suited for small electrical loads. It provides basic protection from current leakage. Usually, it connects one live wire and one neutral wire.

Ideal For:

• Small homes
• Single-phase appliances
• Basic lighting circuits

Four Pole RCCB

This type of RCCB is designed for higher voltage three-phase systems, unlike the single-pole RCCB. Its output is neutral wire; its three inputs are live wires. Since this type of RCCB can better control higher current flows, it is commonly used in industrial environments.

Ideal For:

• Commercial buildings
• Industrial equipment
• Large residential complexes

Types of RCCB by Tripping Characteristics

Poles do not just classify RCCB types, but you can also classify them by their tripping characteristic. To explain simply, various electrical gadgets create different kinds of current leaks. RCCBs are thereby classified according to their detection and response to these flaws.

Type AC RCCB

Designed for use with sinusoidal AC circuits, this is the conventional type of RCCB, as its name suggests. As such, whether smooth or pulsed, it cannot consistently identify DC problems. It won't function with circuits running different frequencies than the conventional 50/60Hz either.

The type A RCCB is appropriate for uses devoid of electronic components that could generate DC problems since it only operates with sine wave circuits. Use it just for the conventional appliance.

Among the types of RCCB, AC RCCBs are used in immersion heaters, incandescent illumination, older electric showers, and such equipment. 

Best for:

• Basic household circuits
• Non-electronic devices like lights or fans

Note: It is not suitable for appliances with electronic components, as it may not detect DC leakage.

Type A RCCB

Type A RCCBs not only find residual sinusoidal AC Circuits but also can react to residual pulsating direct currents from DC circuits. They are recommended for single-phase electronic equipment, appliances with electronic controls, USB socket outlets, single-phase inverters, Class 1 IT, and multimedia equipment.

Specifically, type A RCCB finds uses in circuits including UPS systems, inverters, motor drives, and appliances. You may quickly identify these types of RCCB by their typical AC and pulsed-DC waveform symbols.

Though they are made to guard against the failures of AC and pulsed DC circuits, this type of RCCB breaker will still detect smooth DC currents, only up to 6mA.

Best for:

• Washing machines
• Induction cooktops
• LED lighting systems

Type F RCCB

This type of RCCB is built to trip for composite residual currents, residual pulsing direct currents overlaid on smooth direct currents, and residual currents meant for circuits provided between phase and neutral or phase and grounded middle conductor. Type F RCCBs fit Type AC and Type A applications as well as frequency-regulated equipment like washing machines, dishwashers, and air conditioning controllers with variable frequency speed drives.

With the ability to perceive frequencies other than the normal 50/60Hz, the type F RCCB covers all the features of the two above-mentioned kinds of RCCB, A and AC. Well suited for use with variable frequency drives and other electronic equipment, it can detect up to 1000Hz, or 1 kHz.

These types of RCCB will additionally guard against smooth DC faults for up to 10 milliamps, more than the type A RCCB breaker provides.

Best for:

• Air conditioners
• Modern refrigerators
• Electronic speed controllers

Type B RCCB

Type B RCCBs provide the widest protection, more than any other type of RCCB; they can detect residual sinusoidal alternating currents up to 1 kHz, residual alternating currents superimposed on smooth direct currents, residual pulsating direct currents superimposed on smooth direct currents, and residual smooth direct currents, independent of polarity. They are advised to be used with three-phase electronic equipment, inverters for speed control, UPS systems, electric vehicle charging stations, and Power Electronic Converter Systems (PECS) applied in industrial machinery and cranes. Applications for Type AC, Type A, and Type F also fit Type B RCCBs.

Combining all the features of the previous three types of RCCB (A, AC, and F), the type B RCCB adds the capacity to measure and respond to smooth DC problems.

You might also come across the device in a type B+ variation. Though one that will react to higher frequency faults, this kind is similar to the B-type RCCB. The type B RCCB can respond to 1 KHz; the type B+ RCCB can detect frequencies up to 20 KHz.

Best for:

• Electric vehicle chargers
• Elevators
• Solar panel systems
• Medical equipment

Conclusion

Various uses call for different kinds of RCCB breakers. Whether AC or DC, as well as frequency fluctuations, if any, your choice of breaker should reflect the types of fault currents you wish to guard against. Make sure you know what each type of RCCB can accomplish and that it satisfies the criteria of your specific application, as described in this article.

If you’re looking for the best quality RCCBs from the top brands in India, check out L&T-SuFin now for the best deals.

FAQs

How many types of RCCB are there?

Based on the poles, there are two types of RCCB, Single Pole and Four Pole, and based on tripping characteristics, there are four types, Type AC, A, F, and B.

What is Type S RCCB?

Designed to postpone tripping to give time for non-selective RCCBs (such as Type A or AC) closer to the fault to trip first, a Type S RCCB, sometimes known as a Selective RCCB, is applied in a cascading system to coordinate better and prevent unwarranted power interruptions. It is commonly used in multi-level electrical systems (like buildings with multiple distribution boards) as well as as a main RCCB in combination with other RCCBs downstream.

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by L&T SuFin