The residual current circuit breaker with over-current protection (RCBO), is actually a kind of circuit breaker with a leakage protection function. The RCBO has the protection function against leakage, electric shock, overload and short circuit. The RCBO can prevent the occurrence of electric shock accidents and have an obvious effect to avoid fire accidents caused by electric leakage. RCBOs are installed in our common household distribution boxes to ensure people’s personal safety. An RCBO is a type of breaker that combines the MCB and RCD functionality in one single breaker. RCBOs can come in 1 pole, 1 + neutral, two poles or 4 poles as well as with an amp rating from 6A up to 100 A, tripping curve B or C, Breaking capacity 6K A or 10K A, RCD type A, A & AC.
You need to use an RCBO for the same reasons we recommend an RCB – to save you from accidental electrocution and prevent electrical fires. An RCBO has all the qualities of an RCD with an overcurrent detector.
An RCD is a type of circuit breaker that can automatically open the breaker in case of an earth fault. This breaker is designed to protect against the risks of accidental electrocution and fire caused by earth faults. Electricians also call it RCD (Residual Current Device) and RCCB (Residual Current Circuit Breaker) This type of breaker always has a push-button for the breaker test. You can choose from 2 or 4 poles, Amp rating from 25 A up to 100 A, tripping curve B, Type A or AC and mA rating from 30 up to 100 mA.
Ideally, it would be best to use this type of breaker to prevent accidental fires and electrocution. Any current going through a person more significant than 30 mA can drive the heart into ventricular fibrillation (or throwing the heart's rhythm off)—the most common cause of death through electric shock. 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). A small leakage current coursing through a human body can be enough to kill you. Still, it would probably not increase the total current enough for a fuse or overload the circuit breaker and not fast enough to save your life.
The main difference between both these circuit breakers is that the RCBO is equipped with an overcurrent detector. At this point, you might be thinking about why they market these separately if there seems to be only one main difference between them? Why not sell only kind in the market? Whether you choose to use an RCBO or an RCD depends on the installation type and budget. For example, when there is an earth leak in a distribution box using all RCBO breakers, only the breaker with the faulty switch will go off. However, this kind of configuration cost is higher than using RCD's. If budget is an issue, you can configure three of four MCB under one residual current device. You can also use it for special applications like a jacuzzi or hot tub installation. These installations require faster and less activation current, generally 10mA. Ultimately, whichever breaker you want to use depends on your switchboard design and budget. However, if you're going to design or upgrade your switchboard to stay in regulation and ensure the best electrical protection for both the equipment asset and human life, make sure to get in touch with a reliable electrical specialist.
AFDD is an Arc Fault Detection Device and it is designed to detect the presence of dangerous electrical arcs and disconnect the circuit affected. Arc Fault Detection Devices work using microprocessor technology to analyse the waveform of the electricity. They detect any unusual signatures which would signify an arc on the circuit. The AFDD will instantly terminate the power to the affected circuit effectively preventing a fire. They are considerably more sensitive to arcs than conventional circuit protection devices such as MCBs & RBCOs.
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