Posts Tagged ‘residual current’

Residual Current Circuit Breaker (RCCB)

May 6th, 2014 | 37 Comments | Posted in Electrical distribution
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New article from Manish, one of the members of the EEC! In his last article he told you about Miniature Circuit Breakers (MCBs). Today he will take a look at another important type of circuit breaker called Residual Current Circuit Breaker (RCCB).


A Residual Current Circuit Breakers is another different class of Circuit Breakers. A Residual Current Circuit Breaker (RCCB) is essentially a current sensing device used to protect a low voltage circuit in case of a fault. It contains a switch device that switches off whenever a fault occurs in the connected circuit.

Purpose of RCCB

Residual Current Circuit Breakers are aimed at protecting an individual from the risks of electrical shocks, electrocution and fires that are caused due to faulty wiring or earth faults.

RCCB is particularly useful in situations where there is a sudden earth fault occurring in the circuit.

e.g. A person accidentally comes in contact with an open live wire in the circuit.

In such situation, in absence of an RCCB in the circuit, an earth fault may occur and the person is at the risk of receiving an electrical shock.

However, if the same circuit is protected with RCCB, it will trip the circuit in fraction of a second thus preventing the person from receiving an electrical shock. Therefore, it is a good and safe practice to install RCCB in your electrical circuit.


Residual Current Circuit Breakers

February 12th, 2014 | 3 Comments | Posted in Electrical distribution
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What’s a Residual Current Circuit Breaker? How does it work? When and where do we use it? That’s what Nasir is going to explain in this following article from his tutorial series about Circuit Breakers. Will you agree with him?

Up till now we have studied the circuit breaker as safety devices which only detect the additional or excessive current flowing in a circuit. No doubt, excessive currents are very dangerous for the wiring, circuitry and the equipment which are attached to the circuitry as the load.

But sometimes there is a leakage current in the circuit, which can prove even more fatal, as it deadly for human beings. So the question is that what can circuit breakers do in that case? For this purpose, residual current circuit breakers have been decide the main function of which are to prevent the shocks caused by earth leakage which can prove fatal.

Working Principle of a Residual Current Circuit Breaker

The main principle of working of a residual current circuit breaker is the detection of balance of current is its two wires, since the incoming current should be equal to the outgoing current in an electrical circuit, provided no current loss occurs in the form of any leakages or something.

The breaker is an electrical device that detects the balance of electrical current between two conductors, by using a differential current transformer. One conductor is called the live conductor whereas the other one is known as the neutral conductor.

The breaker disconnects the circuit as soon as it senses that the current is not equal in both the conductors.

Residual Current Circuit Breakers 1


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