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'title' URGENT! How to switch off the Miniature Circuit breaker(MCB) without flipping the switch manually? I need to find a way to switch off or get the mcb in trip position? Answered

Hi Guys

I'm working on a personal project of mine. It requires me to switch off the MCB without manually flipping the switch. I'm using Arduino Uno. The code will get the arduino to do whatever I want. I just need to find a way to switch off the MCB without flipping it. For example, can it be done from some port behind the MCB? Or can I use the upper and lower terminals for the same? I'm out of ideas and I need help. Is there any way we can switch it off, then please tell

Any suggestions are appreciated

Thanks

Comments

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0
Palm9489
Palm9489

10 months ago

Just reading the comments above, is it imperative that the mcb is turned off?

2
proflarry
proflarry

11 months ago

You can buy a circuit breaker with what is called an auxiliary coil. It is made to do exactly what you speak of. It is a low voltage coil that could be driven from the Arduino via a transistor switch. It essentially turns a regular breaker into sort of a relay, except it's a one time deal. Once switched off by the aux coil, you must manually reset it from its normal handle.

0
DaInnovator
DaInnovator

Reply 11 months ago

Just to clarify, once it is switched off by the coil, and I manually go and put the MCB in the on position, will the coil once again work in the same manner, or am I supposed to install it again in some way.
Thanks for your advice

0
360Moore
360Moore

Reply 10 months ago

No, you will not have to install again. Once you switch it off using the coil, you will just have to turn it back on with the switch. It will work in the same manner.

0
DaInnovator
DaInnovator

Reply 11 months ago

Thanks for your suggestions guys
I would like to know if I will have to go very deep in the circuitry of the MCB to install these relays, because as per my study I'll have to take apart the board. If that's not the case then please advise on the steps.
Thanks Again for your time and support

1
360Moore
360Moore

10 months ago

I think the most important thing to note here is that breakers aren't switches installed for your convenience, so you can switch things on and off easier. They are life or device-saving devices that aim to shut off a circuit when there is a fault. Tampering with or jerry-rigging one is a terrible idea (because you could die), and, for example, if your house burnt down because you accidentally allowed a dangerous electrical condition to occur, and the fire investigator determined this to be the cause, you could be left with no insurance payout!
Much, much better idea to install some sort of relay further down the line.
Good luck and please be safe.

0
DaInnovator
DaInnovator

Reply 10 months ago

thanks a lot for your advice sir, i am not tampering with the circuit breakers, i just wanted to confirm whether my theories or methods I have thought of can be used or not. Due to this discussion i have confirmed the same.
thanks again

0
360Moore
360Moore

Reply 10 months ago

No problem - but I think everyone is curious at this point - what are the specifics of this project and why would they possibly require you to trip the breaker instead of installing a relay?

0
DaInnovator
DaInnovator

Reply 10 months ago

Yeah
I'd rather not reveal them. I'm actually not a science student. Lets just say I've been trying to interlink my house's various switches and appliances together. The MCB was the biggest problem due to it's high risk.

1
handypat.sa
handypat.sa

11 months ago

As per Downuder35m, the safest and most responsible way is to place something down the line. It really is better NOT to try and modify the breaker.

Use a relay with a low voltage, e.g. 12V DC, actuating coil but high voltage and current contacts, e.g. 220V 20A.

The Arduino can be used, with a small amount of extra circuitry, to break the mains feed, by activating or deactivating the relay, and you could even reset the circuit via the Arduino. (No physical need to reset a breaker.)

I trust this will help you.

0
360Moore
360Moore

Reply 10 months ago

handypat is totally correct on this one - for 2 reasons. If you chose to modify the breaker electrically (e.g. the kind of port you were talking about, not that I think one exists), that is inherently dangerous because you are tampering with a lifesaving device. Never a good idea. Secondly, you could modify the MCB mechanically - putting a small servo on the front to physically flip the switch sounds like a good idea - until you consider that as soon as you put the servo into the 'on' position, the switch is now being physically blocked from tripping because of the servo arm. Now, that diagram does look complex, so I'm not going to try and decipher it, but it might be possible that if you physically lock the switch in the 'on' position, the breaker could be unable to trip and so whatever deadly thing caused it to trip will just continue to cause damage or death. Not fun.

0
DaInnovator
DaInnovator

Reply 10 months ago

i have to get the MCB in the off position.
i have devised a couple ways to do it mechanically,
A solenoid and A Robotic pulley/arm
leaning towards the solenoid.

0
handypat.sa
handypat.sa

Reply 10 months ago

If you really want to trip the MCB........

Build your project with a secondary MCB built into it. For the sake of safety, make it lower rated than the one you will be feeding from and trip this breaker.

DON'T mechanically, or any other method, trip the breaker on the mains board.

Please understand that there are people here that are trying to help you build your project in the safest manner!

Safety first, always!

1
Jack A Lopez
Jack A Lopez

11 months ago

Do they make a version of this breaker that trips in response to ground fault; i.e. current detected on the ground wire? Wikipedia calls this kind of breaker, a "residual current device"

https://en.wikipedia.org/wiki/Residual-current_dev...

Although, I think where I live they are called GFCI, (for ground fault circuit interrupter?)

The reason why I ask, is because that kind of breaker can be tripped relatively small amounts of current, like a few milliamperes, I think. I mean, it is an amount of current very small compared to the current needed in the main circuit, like 10 or 15 amperes, for a typical breaker, like found in a breaker box in anyone's house anywhere.

In fact that kind of breaker often comes with a little button to push, labeled "TEST" which does what we expect; i.e. it puts a little current on the ground wire.

For an ordinary breaker there are two ways to trip it: (1) Draw too much current on that circuit. (2) Flip it off by hand.

Intentionally drawing too much current seems like a bad idea to me, which is why I suggested using a ground fault breaker, because those can be tripped, essentially harmlessly, via very small amounts of current.

0
DaInnovator
DaInnovator

Reply 11 months ago

Thanks for your suggestions guys
I would like to know if I will have to go very deep in the circuitry of the MCB to install these relays, because as per my study I'll have to take apart the board. If that's not the case then please advise on the steps.
Thanks Again for your time and support

0
Jack A Lopez
Jack A Lopez

Reply 11 months ago

In the case of a ground fault detecting breaker, I do not think you need to take the breaker apart, or modify it in any way.

Rather, the trick to making this kind of breaker trip, is to allow a small current to flow on a path outside of the wires that go through the breaker.

I mean, specifically, the breaker has wires for line and neutral going through it, and everything is fine, as long as the current in those wires is equal. However if a small amount of current is allowed to flow on a different path, like passing through the hot wire, through the breaker, but returning on a different wire, outside of the breaker, that bypasses the neutral wire going through the breaker, then the breaker will sense the lack of balance in its hot+neutral pair, and trip off.

0
DaInnovator
DaInnovator

11 months ago

Thanks for your suggestions guys
I would like to know if I will have to go very deep in the circuitry of the MCB to install these relays, because as per my study I'll have to take apart the board. If that's not the case then please advise on the steps.
Thanks Again for your time and support

2
Downunder35m
Downunder35m

11 months ago

No offense but the electrically correct way would be to add a relais, SSR or such in line AFTER the circuit breaker...