Looking at the picture of the contacts it looks like it fits a QO panelboard but who knows. I wonder what Jim Pauley (SqD rep) would say about that. I used to like watching him spar with Harvey Johnson of C/H (Challenger) about classified breakers. These aren't even classified.
The strange thing is Amazon sells real Eaton breakers for about the same price but they may be counterfeit.
I don't think circuit protection is the place I want to pinch pennies.
Amazon is basically TEMU these days.
