AFCI breakers react to arc signatures. The circuit should be gone through and all connections should be tightened. It’s possible that there is micro arcing somewhere. I have seen this resolve nuisance tripping before.
Nuisance tripping of AFCI circuit breaker by inrush of current when turning on amplifiers
I recently added an Accuphase power supply for my Accuphase mono blocks. When I turn on the second mono block it trips the AFCI circuit breaker. I had no trouble using the mono blocks with a Puritan Audio PSM 156 power conditioner, but it is passive. The Accuphase PS-1250 is power regenerator with a huge toroidal transformer and a large mechanical on/off switch. I imagine either the inrush of current from the PS-1250 + 2 mono blocks is too much for the AFCI breaker or their mechanical switches are creating arcs their algorithms do not recognize as normal.
I have a 10 year old Siemens 15 amp AFCI breaker, and my question is what best to replace it with? I have read that AFCI breakers have improved considerably with less nuisance tripping, and the first step would be to use a current model as a replacement. But is there a better solution?
Square D makes 'High Magnetic' AFCI breakers that are less prone to nuisance tripping, but I don't know if they would even fit in my panel. I'm not sure if Siemens makes a similar product.
An electrician coming over at the end of the week, but I thought I would ask here as this must be an issue many audio hobbyists have encountered with AFCI breakers.