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Old 02-17-2009, 05:57 PM   #1
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circuit breakers


There are currents at which a breaker will never trip.

There are currents at which a breaker will trip after 10 minutes.

What is your opinion on how long you would have to wait to be reasonably certain that your breaker will not trip with its present current flow?

In other words, how long before you know if your fix worked, whatever the fix was (moving loads to other outlets, sequencing high current loads, etc.)?

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Old 02-17-2009, 06:03 PM   #2
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circuit breakers


Clamp on ammeter and 10 seconds.

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Old 02-17-2009, 06:28 PM   #3
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As long as the current was below the rated current of the breaker and the ambient temp at the breaker was less than 40C, then I would consider it done.
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Old 02-17-2009, 11:22 PM   #4
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circuit breakers


The trip curves for just about any 120/240 volt breaker under 100 amps flatten out at about 300 seconds.

This means that if a breaker will hold a given current for 5 minutes, it'll likely hold it forever.

There's only about a 10% difference of current capacity between 2 minutes and 5. At less than 2 minutes, the overload capacity goes up quickly.

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Old 02-18-2009, 09:46 AM   #5
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circuit breakers


Thanks, folks.
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