Breaker Question

The first issue is getting people to understand the question. Can you explain a little more ? I can't speak for anyone else, but I have no idea at all about what you are asking. Add some more detail, and I'm sure that somebody here can give you what you want.

GA, Fred. Seems they're not sure of what their doing, so the only safe answer is just what you said.

Be safe and Hire an certified electrician and go to school to learn the fundamentals of electricity. Always stray on the safe side of life.

CODE. CODE. Or CODES. CODES. As red said, it's all there.

We use NFPA/IEC/BS/IEEE or whatever the local flavor is.

Google circuit protection and read.

I'd just use a 500 amp breaker and avoid nuisance resets

Consider the electrical code.

Consider not to touch anything.

Consider to read up on breakers as a way forward.

Consider an electrical engineer or certified electrician for calculation and installment

Consider the lethal force of electricity.

Internet search is a pretty thing:

http://en.wikipedia.org/wiki/Circuit_breaker

What is your intent? Why would you want to know?

current capacity is mentioned on the breaker that you will use. Tripping characteristics, Short circuit fault level withstanding level rating, voltage rate, setting of over current long and shirt time, instantaneous current and time, earth fault/ground fault setting, Frame size, rated current, 3 pole/4pole etc are the parameters to be considered.

Without knowing the applicable codes governing electrical installation and years of experience required to do it properly, you should not attempt any unsupervised installation of, or materials or component selection for, any electrical circuitry or device....

http://www.schneider-electric.us/documents/support/codes-and-standards/circuit-breaker-markings-iaei.pdf

Here is a rule-of-thumb you could go by. Whatever the maximum current flow is, go with a breaker that is 20% greater. That means going up one breaker size (15, 20, 25, 30). You must also up the wire size that will handle the maximum current.

220V is the Electrical Source, the load i 20A. I will use AWG #12 for wire. Is 20A breaker is applicable to use???

No 30A #10...

No, you just would come back to ask for an auto reset breaker.

Standard breakers should not be used for more then 80% of their load rating. Though the breaker is rated for 20 amps that load rating is for short term not to accede 3 hours.

So you will need to use the next size up which is 30 amps. Same with the wire you shouldn't put more the 80% of the load rating on it for long durations. If you increase the breaker size you increase the wire or the wire will fry before the breaker trips.

Breaker is to protect the wire not the device powered by it.

You described the wire in American Wire Gauge, which is only used in America, to the best of my knowledge. The Metric world describes wire size in cross/sectional area, square millimeters.

220V could be either industrial, commercial, or residential wiring, there are typically different electrical codes for each type of installation, with industrial being more strict than commercial and commercial being more strict than residential. A multi-unit apartment building must follow at least commercial level building codes.

I would Strongly Recommend (which is Engineer-speak for 'I cannot order you do do something, but follow this as if it were a direct order') that you talk with a friendly local Electrician, Union Electrician if you can find one. They will be able to help you out with your project much better than a bunch of semi-anonymous yahoos (of which I am one) providing snarky answers to poorly-worded and ambiguous questions.

There should be a number on the breaker right before the "A".

Hopefully she can help?

It's all in the applicable local electricity standards, for example British Standard 7671 for the UK. If in doubt, hire a qualified local Electrician.