On 12/14/2010 10:18 AM, art davis wrote:
> Yes they do, but you have to look past the marketing and look at the data
> sheet. According to the trip curve for their "instant" breakers, the typical
> operating time for current of 2X the breaker rating is just over 100
> milliseconds, where the "non-instant breakers can hang in for over a second
> at the same current. Definitely faster, but far from "instant". In fact the
> fastest time they are guaranteed to operate is 10 milliseconds and that's at
> currents at least 8 X the breaker rating (i.e. 160A for a 20A breaker).
So would you accept "instant" as being correct, if the breaker tripped
within a nanosecond of the short occurring for each foot the short was
from the breaker? (speed of light in wire)?
73, Jerry, K0CQ
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