circuit breakers can get weak....or break and cause arcing to happen inside which could trip when under heavy load.
where it is most common is if they are
1. used as a switch....they are not designed for that. in a pedestal at an rv park they are turned on and off constantly.
2. overheated by drawing right at capacity. our big rigs can push these things to the max. i bet your coach inside has a 60 or 70 amp breaker and the pedestal has a 50 amp.
as we all know, our house breakers tend to last forever, but generally they are not used as switches and are never under near to capacity loads.
my two cents worth and i am sticking to it.
btw, i recently replaced my swimming pool 220v breakers that had gone bad.
tom
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