I don't think this will fly .....
Sq D has gone to great lengths to have a 'unique' style of breaker with the QO. It's a pretty large part of their corporate ethic that only their breakers, only their panels be used.
We're not talking about the 'classified vs. listed' breaker debate here .... I don't think the QO breaker 'fits' in that load center .... I think it was 'made' to fit! As such, I say it's a 'no go' situation,
