What it is and what it does
The Fuji Electric PXF4APS2-0BKA1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed. That sampling rate means it catches fast thermal transients in processes like injection molding or small-zone reflow ovens, where a slower loop would overshoot the setpoint before the controller corrects.
Where it fits
The 1/16 DIN (48 x 48mm) panel cutout is the standard small-controller footprint — fits the same punch as every other 1/16 DIN unit on the market. No DIN-rail adapter; it panel-mounts with the supplied clamp. The 50ms sampling speed suits it for closed-loop control of electric heaters, valve actuators, or small furnaces where the thermal time constant is under a few seconds.