The Fuji Electric PXF4ACA2-0V1A1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed. That 50ms sampling means it catches fast thermal transients in processes like injection molding or packaging seal bars where a slower loop would overshoot.
The 1/16 DIN (48 x 48mm) panel cutout is the standard small-footprint controller size — fits the same hole as every other 1/16 DIN unit on the market. If you're swapping an older controller, the panel cutout and depth are the first check; this one slots into the same 45 x 45mm +0.5mm cutout common across the class. The self-tuning algorithm means it auto-adjusts PID parameters on the first heat-up, saving the integrator from manual loop tuning on the line.