What this controller is
The PXF4AEA2-MVSA1 is a self-tuning 1/16 DIN (48 x 48 mm) compact temperature and process controller from Fuji Electric.
The 1/16 DIN (48 x 48 mm) cutout is the standard panel-mount footprint for temperature controllers — fits the same hole as every other 1/16 DIN unit, so swapping in a failed controller from another brand is straightforward if the wiring and input type match. The 50 ms sampling rate suits processes that need tighter loop response than the typical 100–250 ms general-purpose controller, but it still runs on the same 24 VAC/DC or 100–240 VAC supply common to this form factor.