Where it fits in a panel
The PXF4APE2-FBSA1: The 1/16 DIN cutout (45 x 45 mm) is the standard panel-mount footprint for this controller class; it clips into the panel from the front and is retained by the included bracket — no DIN rail required. The 48 mm depth behind the panel leaves room for the terminal block and wiring in a typical enclosure backplate layout.
