Joe, although I didn't mention it I have already excersized all of the settings and have been gradually increasing the GF setting. If the breaker is tripping due to ground fault then I would expect the power analyzer to show some increase in current at the time of trip. I'm not seeing this and I am using a very high end analyzer. The current is flat line to trip. This is a Square D breaker and it will likely become the fifth one of this type that I've replaced in the last three years. Two of these were 3,000 amp and cost $27,000 each. All behaved exactly as this one is acting now. All factory post mortems stated failure of the electronic trip portion of the breaker. They were all more cost effective to replace v.s. rebuild. All breakers are 10 years old and are in a clean, temperature comtrolled environment.
