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Originally Posted by Matt Adams
Something you need to consider is that the max power output of these motors is well beyond the Amp circuit breaker limit. I have already done the calculation at the breaker limit above so that you don't make the mistake trying to design around something that will trip breakers.
Good luck everyone!
Matt
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First off, thank you for the concrete data.
Now to pull the thread somewhat off topic.
Taking into account that the breakers have a fair amount of tolernece, in that they can tolerate varing amounts of current for varing amounts of time before opening, perhaps it would be possible to gear a motor for a higher power output then might otherwise be possible if you stuck to a strict amprage budget.
In otherwords, if you knew that the 40 amp breaker takes 30 seconds to trip when passing 60 amps, and the motors duty cycle was perhaps only 20 seconds why not gear the motor to produce peak power at 60 amps rather then limiting your self to 40 amps?
Is there any good data on the trip curves for these new breakrs? I just did a quick search, and didn't turn up anything, although I easily could have missed it. Aslo, is there any data on thier cooling? Any data on how quickly they derate after repeated trips (I noticed this was a major problem for my team this year)?
I guess what I am really asking is for some good data on the 40 amp breakers, and just how much we can push them before we get in trouble.
Anyone have any thoughts?
-Andy A.