I didn't have time to mess with anything today. But to answer a few questions on issues that I thought were non issues.
Brand: Cutler Hammer
Style: BR, Arc fault with a yellow button. One of the long ones. ( older style? )
I thought I may try a Square D homeline as well.
I tried one thing at a time.
Once again there are ZERO possibilities of a shared neutral or a mis-wire. The Circuit is coming right off the breaker out of the front of the panel. (Dead front off and door open) straight to a recep that is just hanging there without a box.
The whole thing is three feet long.
I was just trying to see what tripped a arc fault, I was at the shop and had a few min. No kittens or goldfish were injured, inebriated or consumed during this experiment.
I probably have a bad breaker from what I gathered. Thats my luck.
I'll post back after I try a new breaker.