How do you think you get 240 V? *It is two 120 V circuits with the
120V in one circuit 180 degrees out of phase with the 120V in the
other circuit. *Look at it as a 240 V circuit center-tapped, with the
center tap being the neutral/at ground potential.

I have 240V at the sub panel. By using the right breaker, I can access
both 120V lines to get 240V.