low current MCB

[fuzuliyat]

Does it exist any mcb with breaking current less then 0.5A or less ? Any idea..?

 

[oharaf]

Found this, they say they make them from 0.5 Amps

http://www.aecoindia.com/mcb_lr.htm

 

[TicklyT]

RS components list a Siemens 0.3A Type C MCB

RS stock no. 5214888

 

[fuzuliyat]

i think that's misinterpreted... iam not looking for a mcb with rated current less then 0.5 A..i am looking for a mcb which has a breaking current capacity at most 0.5 to 1 A... idea?
Now, you will ask me, what to do with such a mcb... I will use it in a simulation system... Since i wont have real big voltages and currents, to simulate a real mcb in the system, i need a very low rated current mcb... any
idea?

 

[comms]

http://www.cse-distributors.co.uk/distribution/abbmcb-pf.htm

 

[RF Lighting]

No then.

There is nothing designed to fail at such a small fault current.

There is just no application for it in the real world.


<edit> do you mean the operating current, or the breaking capacity?

You can have high current without high voltage.

 

[fuzuliyat]

No, its breaking capacity should be near 1 amp. Normally it is used fuses for this values but i need a mcb...

 

[fuzuliyat]

Ok, let me ask that way then..is it possible to modify a mcb to make it work with very low breaking currents ?

 

[Adam_151]

I'm still confused, which parameter are we discussing, "breaking capacity" refers to the maximum current which a protective device can safely break and is normally expressed in thousands of amps.

Are you really looking for an MCB which will explode if exposed to a fault of more than 1 amp... because supprisingly enough, they don't make them

 

[ban-all-sheds]

Ok, let me ask that way then..is it possible to modify a mcb to make it work with very low breaking currents ?

Please stop saying "work" - you don't mean that, you mean "fail".

How on earth could you modify an MCB with a breaking capacity of, say 6,000 amps to only have a capacity of 1A?

But why do you want to do this? Can't you just simulate an MCB not breaking by connecting a switch in parallel?

 

[fuzuliyat]

another way of explanation:

it wont break the circuit, for a current about 0.1 mA(its rated current) ; but for 1A it will break the circuit, it will not explode...it will just stop conducting if it sees a 1 A of current...

 

[JohnD]

you mean you want it to "trip" at 1 Amp.

So oharaf's suggestion would do.

 

[fuzuliyat]

But why do you want to do this? Can't you just simulate an MCB not breaking by connecting a switch in parallel?

I want it to break, because, the user should see that he had made a mistake and the mcb broke current. then the user will correct his mistake; he will open the mcb and put the system into service...

That is not a simulation of just a mcb; it is a whole system for training the user...

 

[Spark123]

another way of explanation:

it wont break the circuit, for a current about 0.1 mA(its rated current) ; but for 1A it will break the circuit, it will not explode...it will just stop conducting if it sees a 1 A of current...

0.0001A
You're talking very small currents, AC or DC? You should be able to make some sort of current monitor which can be used to drop out a retaining contact?
Providing is it purely for training purposes and is also correctly protected using fuses, I'm thinking you may be able to make something from an RCD i.e. by only using one of the coils it should trip between half and its rated operating current??

 

[ban-all-sheds]

another way of explanation:

it wont break the circuit, for a current about 0.1 mA(its rated current) ; but for 1A it will break the circuit, it will not explode...it will just stop conducting if it sees a 1 A of current...

i think that's misinterpreted... iam not looking for a mcb with rated current less then 0.5 A..i am looking for a mcb which has a breaking current capacity at most 0.5 to 1 A... idea?

You don't know what you're talking about, do you?