The Telemecanique XUSL4E14F046NWH is a Light Curtain — a safety-rated optoelectronic guard used to detect personnel or objects entering a hazard zone. Its sub-category is Light Curtain, placing it in the access-control layer of a machine safety circuit rather than a discrete photoelectric sensor or proximity detector.
As a light curtain, this unit mounts between the emitter and receiver columns across an access point — typically guarding a robot cell, press, or packaging machine. The 14 mm resolution (inferred from the order code suffix) provides finger-protection class per IEC 61496-1/2, meaning it detects a 14 mm opaque object breaking the beam array. That resolution is appropriate for hand-entry zones where smaller gaps (e.g., 30 mm arm protection) would allow a finger through before the machine stops.