SEPAM with a CSH SENSOR , why there are P1 and P2 Side, what is the difference for Sepam Range ?

Without notion of directionality or differential or summation of currents, the wiring of the measuring apparatus doesn’t matter, because it is not sensitive to the instantaneous direction of the current:
It is the case of the ammeters, the maximeters, the over current, or overload,….
For a differential, directional, a energy meter......, one will be more vigilant:
Recall :
The transformers of current windings have reference marks P1-P2 primary side and S1-S2 secondaries side. There are by construction a significant correspondence between the number of the primary label and the secondary one’s.
These reference marks are purely conventional but the use is very important.
You noticed that the diagrams of Sepam documentations are identical (from a connection point of view), for a feeder or an incomer and do not mention P1, P2, S1 neither S2.

IED L3

Released for: Schneider Electric Malaysia