RBM,

You're correct that it's listed inside the box...I found that after
I'd sent this question to the group. It accepts NA, NC, & 2B
(whatever that is?) breakers. And yes, I've spoken with an
electrician and will be using 2 gauge 4 conductor (2 hots, 1 common, 1
ground) copper from this breaker to the new breaker box.

Thanks a bunch.
Charlie