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Re: Can circuit breaker's limit current draw before tripping? (nt)

Posted by jneutron (A) on June 10, 2004 at 12:10:58

In Reply to: Can circuit breaker's limit current draw before tripping? (nt) posted by hexenboden on June 9, 2004 at 08:44:36:

From what I know of them, they are not designed to limit the current during a fault, but to trip after current vs time parameters are exceeded..

For example, a 15 amp breaker...(don't hold me to the numbers, I'm just illustrating what I understand is how they work..)

It's gonna hold 10 amps forever.

at 20 amps, it will trip in say, 15 seconds..
at 30, it may take 20 secs..

at 40, maybe 10 seconds.

etc..

Eventually, you'll get to the currents where it will trip in 10, 100 milliseconds..

All breakers have some kind of current vs trip time performance.

But I don't think they are designed to provide any limiting function.

I think some guys at tweakers can help you..or the mike holt website forum..

Cheers, John

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