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Residual Current Circuit Breaker

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What is Residual Current Circuit Breaker

A residual current circuit breaker must be used in conjunction with a miniature circuit breaker (MCB). RCCBs are the safest device for protecting against earth currents and are utilised across an array of applications. They operate by quickly and automatically cutting off a power supply when unbalanced electric currents are detected. An unbalance may indicate a current leak, which can subsequently pose a significant risk to the circuit.

Residual Current Breaker
A Residual Current Circuit Breaker (RCCB) is an electrical safety device that monitors the balance of live and neutral currents in a circuit and can automatically disconnect the circuit if it...
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Current Limiting Circuit Breaker
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Current Circuit Breaker
Designed to limit the peak value of short-circuit current by swiftly breaking the circuit when a short circuit occurs. This type of circuit breaker can interrupt the circuit rapidly before the...
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Rccb Residual Current Circuit Breaker
RCCB primarily monitors the difference between the loop current and the leakage current to automatically cut off the current when leakage is detected.
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Residual Current Operated Circuit Breaker
The primary leakage protection system is suitable for places with high requirements for personal safety, such as residences, hospitals, and schools.
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Residual Current Breaker
Definition: RCCB is short for residual current operated circuit breaker, which includes a short-circuit protection function, similar to an MCB (Miniature Circuit Breaker).
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How To Choose And Install a Residual Current Circuit Breaker

To choose the right RCCB for a circuit, the following factors should be considered
The type of load and current: The RCCB should match the type of load (AC, DC, high-frequency) and the type of current (pure, pulsating, smooth) that it will protect. For example, a type B RCCB should be used for a solar inverter that generates a smooth DC current.

The rated residual operating current (I∆n): The RCCB should have a low enough I∆n to provide adequate protection against electric shocks, but not too low to cause nuisance tripping. For example, a 30 mA RCCB is recommended for domestic and commercial applications, while a 100 mA RCCB is suitable for industrial applications.

The rated current (In): The RCCB should have a high enough In to handle the normal operating current of the circuit, but not too high to exceed the capacity of the MCB or fuse that it is connected with. For example, a 40 A RCCB should be used with a 32 A MCB for a 230 V single-phase circuit.

The number of poles: The RCCB should have the same number of poles as the supply voltage. For example, a 2-pole RCCB should be used for a 230 V single-phase circuit, while a 4-pole RCCB should be used for a 400 V three-phase circuit.

To install an RCCB, the following steps should be followed

Switch off the main power supply and isolate the circuit that needs to be protected by the RCCB.

Connect the live wire(s) from the supply side to the input terminal(s) of the RCCB marked as L1, L2, and L3.

Connect the neutral wire from the supply side to the input terminal of the RCCB marked as N.

Connect the live wire(s) from the load side to the output terminal(s) of the RCCB marked as L1’, L2’, and L3’.

Connect the neutral wire from the load side to the output terminal of the RCCB marked as N’.

Ensure that all connections are tight and secure and that no wires are loose or exposed.

Switch on the main power supply and test the RCCB by pressing the test button. The RCCB should trip and disconnect the circuit. If it does not, check for any wiring errors or faulty components and fix them before using the circuit.

Reset the RCCB by pressing the reset button. The RCCB should close and reconnect the circuit. If it does not, check for any wiring errors or faulty components and fix them before using the circuit.

Residual Current Operated Circuit Breaker

Types Of Residual Current Circuit Breakers

Type AC RCDs: Detect residual sinusoidal alternating currents. Suitable for most general-purpose applications.

Type A RCDs: Detect sinusoidal and pulsating DC residual currents from single-phase class 1 electronic loads with diode/thyristor rectifiers.

Type F RCDs: Detect multi-frequency residual currents with enhanced disturbance withstand for variable speed motor drives. It can also trip on pure 10mA DC faults.

Type B RCDs: Detect all kinds of residual currents – sinusoidal AC, pulsating DC, composite multi-frequency, and smooth DC from 3-phase rectifiers in variable speed drives, PV systems, EV chargers, and medical equipment.

The different RCCB types provide tailored protection against leakage currents produced by a wide range of modern electrical loads and systems, beyond just simple AC sinusoidal currents. Type B models with universal residual current detection are becoming the new benchmark for maximum safety.

Selection Principle Of Residual Current Circuit Breaker

1. Choose According To Purpose Of Use And Location Of Electrical Equipment

(1) Protection Against Direct Contact Electric Shock
Because direct contact with electric shock is harmful and has serious consequences, residual current circuit breakers with high sensitivity should be selected. For electric tools, mobile electrical equipment and temporary lines, residual current circuit breakers with action current of 30 mA and action time of 0.1s should be installed in the circuit.

If an electric shock is likely to cause secondary hurt (such as high-altitude operations), a residual current circuit breaker with an operating current of 15mA should be installed in the circuit. For electrical medical equipment in hospitals, a residual current circuit breaker with an operating current of 6mA should be installed.

(2) Indirect contact electrocution protection
Indirect contact electric shock in different places can cause different degrees of personal injury. Therefore, different residual current circuit breakers should be installed in different places. Residual current circuit breakers with high sensitivity are required in places with high hazards of easy electric shock. Electrical shock in wet places is much more dangerous than in dry places. Generally, residual current circuit breakers with action current of 15-30mA and action time of 0.1s should be installed. For electrical equipment in water, residual current circuit breaker with action current of 6-10mA and action time of US stage should be installed.

For electrical equipment which the operator must stand on metal objects or in metal containers, as long as the voltage is higher than 24V, residual current circuit breakers with action current below 15mA and action time at US level should be installed. For fixed electrical equipment with 220V or 380V voltage, when the grounding resistance of the enclosure is below 500fZ, a residual current circuit breaker with action current of 30mA and action time of 0.19s can be installed on a single machine.

For large electrical equipment with rated current above 100A or power supply circuit with several electrical equipment, residual current circuit breaker with action current of 50-100mA can be installed. For grounding resistance of electrical equipment below 1000fZ, residual current circuit breaker with action current of 200-500mA can be installed.

2. Choose based on the normal leakage current of the circuit and equipment

(1) The action current of the residual current circuit breaker used by a single machine should be 4 times higher than that of the leakage current under normal operation of the equipment.

(2) For the residual current circuit breaker used in branch line, the action current should be 2.5 times higher than the leakage current of the normal operation of the circuit, and 4 times higher than the leakage current of the electrical equipment with the largest leakage current in the circuit.

(3) The action current of residual current circuit breaker for main line or general protection of the whole network should be 2.5 times higher than that of leakage current under normal operation of power grid.

The Advantages Of Using Residual Current Circuit Breaker

01/

Electrical Safety: RCCBs provide effective protection against electric shocks by swiftly disconnecting the circuit in the presence of a residual current, minimizing the risk of injury.

02/

Fire Prevention: By promptly detecting and isolating faulty circuits with leakage currents, RCCBs contribute significantly to preventing electrical fires.

03/

Equipment Protection: RCCBs safeguard electrical appliances and equipment by preventing damage caused by faulty currents, ensuring the longevity of devices.

04/

Compliance with Standards: The use of RCCBs aligns with electrical safety standards, meeting regulatory requirements and enhancing overall electrical system safety.

05/

Versatility: RCCBs are versatile and can be installed in various electrical installations, offering protection in residential, commercial, and industrial settings.

06/

Early Detection: The rapid response of RCCBs to residual currents allows for early detection and mitigation of potential electrical hazards, ensuring a safer environment.

Working Principle Of Residual Current Circuit Breaker

The working of an RCCB (Residual Current Circuit Breaker) is based on the Kirchhoff’s Current Law (KCL) which states that the incoming and outgoing currents in an electric circuit must be equal. The RCCB utilizes this law to compare the difference between phase and neutral currents in an electric circuit.

In any electrical circuit, the phase wire is the conductor that carries electric current from source to load and the neutral wire is the conductor that carries the electric current from load to source. Ideally, these two currents must be equal. This happens only when there is no leakage of current in the circuit.

In case of a fault, the current in the neutral wire becomes unequal to the current in the phase wire. The difference between these two currents is known as residual current. When the RCCB detects the residual current in the circuit, it trips off the circuit.

The Function Of Residual Current Circuit Breakers

This can effectively avoid the occurrence of dangerous situations such as electric shock and fire. At the same time, residual current circuit breakers can also play a role in uninterrupted power supply protection, that is, in the event of an electrical fault, the power can be immediately cut off to prevent any personnel and equipment from being injured. Therefore, residual current circuit breakers are essential electrical equipment in modern household and industrial electricity environments.

The function of residual current circuit breaker

To ensure the safe operation of electrical equipment in households, we can take various measures. One of them is to use residual current circuit breakers. The management of household appliances requires comprehensive consideration of various factors, including circuit breakers, switches, sockets, etc. These devices can provide effective protection for home electrical systems.

Circuit breakers are an important component of household electrical systems, and their series of products have functions such as short circuit protection, overload protection, leakage protection, and lightning protection. Among them, leakage protection is an important safety measure that can effectively solve the risks caused by leakage.

We should actively take measures to ensure the safe operation of the household electrical system, making the home a warm and comfortable harbor.

Selection and purchase of residual current circuit breakers

It is recommended to pay attention to the flexibility and safety of the product when selecting residual current circuit breakers. This type of circuit breaker should usually be installed on the circuit circuit circuit, with a current of 30mA and a working time of 0.1 seconds. It is widely used in residential spaces, especially recommended for installation at the meter location. Protecting circuits and ensuring life safety is always a concern for us, so choosing the right residual current circuit breaker is very important.

The degree of harm to the human body varies depending on the occurrence of indirect electric shock problems in different places. Therefore, when selecting residual current circuit breakers, it is necessary to select the most suitable product based on the actual situation. Especially for areas prone to leakage issues, we need to use more sensitive products to ensure people's safety. For example, in damp spaces, electric shock accidents are often more likely to occur. Therefore, in order to ensure the safety of the electrical system, we should choose a leakage circuit breaker with a current range of 15-30mA and a working time of no more than 0.1 seconds. This not only effectively avoids the occurrence of electric shock accidents, but also improves the reliability and safety of our electrical system.

When using underwater electrical products, safety must be ensured. Electrical appliances should be equipped with leakage protectors. It is recommended to choose a current value of 6-10mA, and the working time should not exceed US. At the same time, it is important to note that users should stand on metal tools. If the current exceeds 24V, a residual current circuit breaker with a current below 15mA and a holding time within US should be used. Protect your own safety, grasp the details, and make life more beautiful.

Our Factory

Yueqing City, Zhejiang Province, Fangdouyan Industrial Zone. The company focuses on the field of high and low voltage electrical equipment industry, specializing in the production of universal circuit breaker series, plastic circuit breaker series, small circuit breaker series, AC contactor series, surge protector series, load isolation switch series, isolation knife switch series, control and protection switch series, double power automatic transfer switch series, high voltage components series and other products.

FAQ

Q: What does a residual current circuit breaker do?

A: The Residual Current Circuit Breaker (RCCB) or commonly known as the circuit breaker is an electrical safety device that cuts off the electricity supply immediately upon detecting leakages that may result in an electric shock.

Q: Why does my residual current circuit breaker keep tripping?

A: Common causes of RCD tripping include overloaded circuits, moisture ingress, damaged wiring, earth leakage, and faulty appliances. Proper handling of the RCD switch, such as knowing the up and down positions, is important for electrical safety.

Q: How do you test a residual current circuit breaker?

A: Push-button Test on RCDs
When you press the test button, and the RCD has detected an imbalance, the on/off switch will jump to the “off” position. The test button will only test the RCD if an electricity supply is connected.

Q: What to do if you're on an RCCB trip?

A: When an RCCB trips unexpectedly, always visually scan for smoking devices or sparks indicating a serious short. If found, shut off power at the main breaker before investigating. However, if no physical risks are evident: Reset RCCB Switch – Clear any temporary trips by flipping the switch fully off then on again.

Q: How do you know if an RCCB is faulty?

A: Test the ELCB or RCCB by pressing the 'Test' button. The ELCB or RCCB switch will flip down and cut off all power supply in your home. If the ELCB or RCCB switch does not flip down, it is faulty. Homeowners should contact a Licensed Electrical Worker for assistance immediately.

Q: What does a residual circuit breaker do?

A: Residual Current Circuit Breaker or RCCB is basically a gadget that senses current and disengages any low voltage (uneven current) circuit whenever a fault occurs. The main purpose of installing a Residual Current Circuit Breaker fundamentally is to protect people from electric shocks or death caused by them.

Q: Can RCCB be repaired?

A: If your MCCB requires maintenance, our factory-trained technicians will make all necessary repairs. Because we stock thousands of parts in-house, you'll get your MCCB within one to five days for minimal downtime.

Q: How often should RCCB be tested?

A: You are advised to test your ELCB or RCCB once a month to check that it is in good working condition. All homeowners can engage a Licensed Electrical Worker to install an RCCB if necessary.

Q: How do you test a residual circuit breaker?

A: How to test my RCDs? Pushing the test button simulates an earth leakage fault and should trip the RCD switch if this happens the RCD is operating correctly. This test is called the “push-button test” which any person can easily do safely.

Q: Why does my residual current switch keep tripping?

A: If the RCD's rated value is too low, it will trip unnecessarily. You may find that your RCD is tripping repeatedly. This could indicate that it has the wrong rated current and should be replaced with one of the correct rating. All RCDs should trip when the current exceeds its rating.

Q: How do I reset my RCCB switch?

A: To reset it, the lever simply needs to be pushed back UP. For some RCDs, it is necessary to push the lever fully downwards before it will let you push it back UP and reset. In many cases, this will be fine.

Q: What type of RCCB is needed for a home?

A: Electricians recommend modern RCCB types (Type A or similar) with a 32-63A rating and a tripping sensitivity of 30 mA. Most household RCCBs have a sensitivity of 30 mA because that's how much current the human body can bear within a 300 ms timescale, as we explained earlier.

Q: How do I check if my house has RCCB?

A: Current leakages can be caused by factors such as ageing or exposed wires, faulty electrical appliances, and damaged insulation. The RCCB is usually located in the distribution board (also known as DB box) or circuit breaker box in your home. It can be identified as a switch with a 'Test' button.

Q: What is the difference between a circuit breaker and a residual circuit breaker?

A: Understanding the main differences between an RCD and a circuit breaker empowers you to make smart decisions about electrical safety. While circuit breakers help prevent fires and equipment damage, RCDs are superior for detecting lethal leakage currents and preventing electrocution.

Q: How do you choose a residual current circuit breaker?

A: RCCB's can be classed according to four parameters:
type of construction.
detectable wave form.
tripping sensitivity.
tripping time.

Q: Why does my residual current device keep tripping?

A: Reasons Why Your RCD Might Be Tripping
Moisture: Moisture or dampness around electrical circuits can be the cause of current leakage. This is often the build-up of condensation. Keep electrical components clean and dry to avoid this.

Q: Where is RCCB installed?

A: The RCCB is usually located in the distribution board (also known as DB box) or circuit breaker box in your home. It can be identified as a switch with a "Test" button.

Q: Which one of these is also called as residual current circuit breakers?

A: These residual current circuit breakers (RCCB) are popularly called as Earth leakage circuit breakers (ELCB). Working principle: The residual current device (RCD) is a circuit breaker which continuously compares the current in the phase with that in the neutral.

Q: How to tell the difference between an RCD and a circuit breaker?

A: An RCD stops the current within 25 to 40 milliseconds before an electric shock could occur. By contrast, conventional circuit breakers such as MCB/MCCB (Miniature Circuit Breaker) or fuses break only when the current in the circuit is excessive (which can be thousands of times the leakage current an RCD responds to).

Q: What are the different types of residual circuit breakers?

A: The most important (and most versatile) types of RCCB breakers are the type A and B. As we have seen, they differ in the way they detect and react to fault currents. Starting with RCCB type A, we can see that you can use it to detect AC and pulsed DC faults.

As one of the most professional residual current circuit breaker manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy customized residual current circuit breaker made in China here from our factory.

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