Posts Tagged ‘current circuit’

Residual Current Circuit Breaker (RCCB)

May 6th, 2014 | 36 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.


Earth Leakage Circuit Breakers

February 17th, 2014 | Make a comment | Posted in Electrical distribution
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Last time, Nasir told us about Residual Current Circuit Breakers, today, the topology continues with Earth Leakage Circuit Breakers. Did you know about them?

Earth Leakage circuit breakers are the breakers that are used to detect the leakage currents that are produced due to circuit connection faults or other factors and are leaked to the Earth, causing severe shocks and fatal outcomes for the humans.

Since we have already studied enough about these circuit breakers along with their types, that at this point all of you may be wondering that the function of the Earth Leakage circuit breakers is sounding the same as that of the Residual current circuit breakers.

No doubt, that it is true to some extent, but here’s the explanation:

Types of Earth Leakage Circuit Breakers

Earth Leakage Circuit breakers were previously classified into two broad categories which were as follows:

  1. Earth Leakage Current Circuit Breakers
  2. Earth leakage Voltage Circuit Breakers

These two types, both falling under the category of Earth Leakage circuit breakers ELCB were often not properly distinguished and confused with one another, resulting in problems such as the use of one type in place of another.

So the first one of this category, that is the Earth Leakage Current Circuit Breakers were named as the residual current circuit breakers, so that they could be properly differentiated by their name and the function of both these types of circuit breakers could be clearly distinguished and the proper one would be used in its place.

The later one is now commonly termed as Earth Leakage current circuit breakers.

Since we have now already studied the Residual Current circuit breaker, which is the former one of this category, so here I am going to discuss the Earth Leakage Voltage Circuit breakers.


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