What breakers are not tested for is the trip time when operated at under its
current rating. It is not uncommon especially as the breakers age or have
been tripped repeatedly, to trip at less than 100% of its rating. I've
replaced breakers many times that would trip when under 80-95% of its rated
load after several minutes.
I can confirm that I have also seen this behavior. In my experience this
happens after breakers have been run near load limits for months to years.
Cheers,
Bruce
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