The Omron F3SG-4SRA0240-45 is an active-production safety light curtain from the F3SG-SR series, rated for Arm/Foot protection with a 45mm detection capability. That detection figure means it catches a 45mm-diameter object anywhere in the field — sized for hand and lower-arm intrusion, not just fingertip. The 240mm protective height and 40mm beam pitch (6 beams total) define the guarded zone; the 0.3m to 20.0m operating range gives flexibility from tight machine guarding to wide-area perimeter coverage.
The 45mm detection capability is the key selection parameter — it determines the minimum object size the curtain will reliably detect. For Arm/Foot protection (per IEC 61496), that's the correct spec; a 14mm or 30mm unit would be overkill and costlier. The 240mm protective height covers a specific zone; if your opening is taller, you stack multiple units or step up to a longer model in the same series. The 40mm beam pitch and 6 beams are the physical resolution behind that detection number. Supply is 24VDC, standard for safety light curtains. The IP65/IP67/IP67G rating means it's dust-tight and protected against water jets and temporary immersion — IP67G adds oil resistance, relevant for machining environments with coolant mist. Blanking and muting functions are built in. Blanking lets you disable specific beams to allow a workpiece through without tripping the curtain; muting temporarily suspends the safety function during a defined material-handling cycle. Both are configured via the controller, not hardwired.