If you look at the diagram with a reversing loop at each end¡ the PSXX-AR on the left side is powered from a PSXX. The one for the right end is powered directly from a booster. (One or two boosters makes no difference as they are supplying the same power)
This tells me that the PSXX-AR has it¡¯s own over current shutdown mechanism despite power capability of the booster (not the same as current LIMITING).
I say always wire the input side of the PSXX-AR, or other AR controller, directly from the booster. Never from the output side of any other electronic breaker.
DonV