How to select RCCB? | How do we select an RCCB MA rating?

How to select RCCB? | How do we select an RCCB MA rating?

Today’s post is going to be very important, how do we select the rating of RCCB in this post? Talking about it.

Whenever we see a Residual Current Circuit Breaker, there are two ratings written on it. For example, 30mA is written with 25A on one Residual Current Circuit Breaker while 100mA is written on the other Residual Current Circuit Breaker with 25A. You can also see it in the image below.

rccb

This image means that both RCCBs are of 25A, but with it written 30mA on one and 100mA on the other. So what is this 30mA and 100mA after all? This we are going to talk about in today’s post.

What are 30mA, 100mA, and 100 mA in RCCB? | What is 30mA, 100mA and 300mA on Residual Current Circuit Breaker?

So friends, to understand this, first of all, you have to take care of some things. As 25A is written on your Residual Current Circuit Breaker, it means that you can connect up to 25A load on your RCCB. Meaning on this Residual Current Circuit Breaker you can pass current only up to 25A simultaneously and if more than 25A current will pass then this Residual Current Circuit Breaker will not work at that time.

If you want to know how many amperes we have to put RCCB on where?

So friends, the way we decide the rating of MCB, we can also decide the rating of Residual Current Circuit Breaker. If MCB is already installed somewhere and you have to install Residual Current Circuit Breaker there, then we can install RCCB of the same rating of which MCB is installed. For example, if a 16A MCB is installed, then you can put a 16A Residual Current Circuit Breaker in that circuit.

rccb

Now this question must be coming into everyone’s mind what is the second rating on Residual Current Circuit Breaker which is written in mA? And where do we have to put the RCCB of how many mA ratings?

How to select the mA rating of RCCB? | How to select mA rating of Residual Current Circuit Breaker?

Friends, this second rating on Residual Current Circuit Breaker is written in mA, we call it the sensitivity range of Residual Current Circuit Breaker. This means that how sensitive our RCCB is, comes to us from this second rating. Apart from this, we should also be clear about one thing. That is the Residual Current Circuit Breaker market you get to see only three sensitivity ranges of 30mA, 100mA, and 300mA.

But now the next question is 30mA, 100mA, and 300mA, which of these RCCBs should be installed at home, and which RCCB is used in the industry? So let us know one by one which RCCB is installed where? Know it.

Where to use 30mA RCCB? | Where to use 30 mA Residual Current Circuit Breaker?

If friends talk about 30mA RCCB, then we put this Residual Current Circuit Breaker where the direct touch of the load is with our body. For example, if we talk about our house, then our fridge has become, the washing machine has become, we are touching them directly. So in such a place where we are repeatedly touching the load, at that place, we put a Residual Current Circuit Breaker of 30mA.

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 Because friends 30mA RCCB is very sensitive. So this Residual Current Circuit Breaker trips as soon as only 30mA of current leaks from the supply wire. That is if the supply wire touches our body, then in that case this Residual Current Circuit Breaker will trip very fast and we will not suffer much due to current.

If we understand in simple words, then we use RCCB of 30mA where we need a lot of protection.

Example: We touch the fridge again and again in the house, now if there is a fault, the current starts leaking from that fridge and we have not installed Residual Current Circuit Breaker, then it may be that touching the fridge gives us a very strong shock, due to which Let us die Or if the Residual Current Circuit Breaker that you have installed is of high sensitive rating, then it will not trip quickly, due to which we will get current even if the Residual Current Circuit Breaker is installed. So that’s why in such a place where we touch the load again and again, at those places we put high sensitive means 30mA RCCB.

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Where to use 100mA RCCB?

Now if we talk about 100mA Residual Current Circuit Breaker, then we can also use this Residual Current Circuit Breaker in our homes. But if you are asked in the interview, where is its main use? So you guys can say that 100mA RCCB is used where Inherent current is already present. The digital devices that we have, like our laptops, all have some leakage current inside them. We call this the current Inherent Current.

Apart from this, we use 100mA Residual Current Circuit Breaker where there are many digital devices such as call centers, and data centers, many of our digital devices are connected in all these places. But now you will say that we have laptop computers even in our homes, so we should put 100mA Residual Current Circuit Breaker in our homes too?

So, friends, we have only one or two laptop computers in our homes, but many digital devices are connected in those call centers. So in a place where we use a lot of digital devices, we use Residual Current Circuit Breaker with a 100mA sensitivity range.

Where to use 300mA RCCB?

Now talk about Residual Current Circuit Breaker with 300mA, it will be used very less in homes, but if you ever go to industry or in any big hotel and see it, it is used there, because it is used in most fire protection circuits.

RCCB

Apart from this, for large machines where the leakage current is already very high, such as a welding machine or a cutting machine, then for these we use Residual Current Circuit Breaker with a 300mA sensitivity range. This Residual Current Circuit Breaker is not used in homes because it does not protect us in any way. It is used only where already leakage current is very high.

Hope you guys have got the answers to all the questions. But if still any questions remain, then you can tell us in the comment, and you can also send us your questions on the contact page “MSPOWERTECH”

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