What the sub-category tells you
The XUSL4MA40H196N: Sub-category Light Curtain means this is a safety-rated optoelectronic protective device, not a general-purpose photoelectric sensor. It's designed to create a guarded area where an interruption of the light beams triggers a stop signal to the machine control system. In a pit or mill environment, that's the difference between a sensor that detects a rock on a belt and one that stops the crusher drive before a hand reaches the nip point.
