11-27-2009 07:41 AM
05-13-2010 05:37 PM
If a breaker is suspect, we recommend testing it with an ammeter in series with the load passed through the breaker. For example, a Cat 60 amp rated breaker would carry ~120 amps for 10 seconds. If you measure 120 amps, and it trips right away - replace it. If you measure MORE than 120 amps, then you have the wrong breaker for the application.
Most breakers will carry 200% of the rated current for ~10 seconds. If you are moving current, you need to know the basic calculations.