The Omron F3SJ-A1250P20-01TS is a Type 4 safety light curtain from the F3SJ-A series, rated for finger and hand protection with a 20mm detection capability. That 20mm detection means it catches a finger reaching into the hazard zone — finger-protection class per IEC 61496-1 — so it's suited for guarding access to presses, robots, and automated assembly stations where a person could reach into danger.
The protective height is 1250mm, covered by 83 beams spaced at a 15mm pitch. This gives you a detection plane that covers the full height of the opening — no gaps between beams. The operating range runs from 0.2m up to 9.0m, so it works for both tight machine guarding and longer perimeter setups. Power is 24VDC, standard for safety circuits. The housing is rated IP65 — dust-tight and protected against water jets — which means it holds up in washdown environments or dusty factory floors without needing an extra enclosure. Built-in blanking and muting functions are on board, so you can program out fixed obstructions (like a machine frame) or temporarily bypass the curtain during a material feed cycle without external logic.