During recent work we've been upgrading breakers to dual arc-fault / ground fault. Square D QO series (USA).
I've noticed a couple of them tripping pretty frequently when certain appliances are used.
Kitchen circuit consistently trips when the Keurig coffee machine completes its cycle
A different circuit often trips when a power saw is used; not as certain but it may be when it is powered off
So the question is: are these faulty breakers? Faulty equipment? Something else?
If its bad equipment, OK so be it, I'll replace them, maybe warranty issues. But I'm skeptical they are the problem - eg the coffee machine is pretty new-ish. Neither item had any (evident) problems on the older circuits.
Is there some kind of tester, perhaps, which could tell me why the trips are occurring? Or some other diagnostic method? For one thing I can't tell if this is the arc-detection, ground-fault detection, overcurrent, or some other reason.