The F3SG-4SRB0400-25 is an active-production Omron F3SG-SR series safety light curtain rated for hand protection with a 25 mm detection capability. Its 20-beam array at 20 mm pitch covers a 400 mm protective height, and the operating range spans 0.3 m to 20.0 m, which is enough to guard a large machine cell entry or a robot work envelope without intermediate reflectors. Supply is 24 VDC, standard for safety-rated control systems, and the enclosure carries IP65/IP67/IP67G — dust-tight, waterproof, and oil-resistant, so it holds up in washdown zones or machining environments where coolant mist is constant. Built-in blanking and muting functions are included on the emitter-receiver pair, which means you can program fixed or floating blanking zones to ignore stationary fixtures (clamps, part supports) and set up muting sensors for material pass-through without tripping the safety output. That saves an external safety controller for simple muting applications.
The 25 mm detection capability and hand-protection classification place this curtain in the finger/hand category per IEC 61496 — it will detect a 25 mm diameter object anywhere in the field. That is the spec that governs the minimum object size the curtain can reliably see; a smaller gap (14 mm) would be needed for finger detection, but for hand access this is the standard choice. Protective height of 400 mm with 20 beams at 20 mm pitch means the actual guarded zone starts at the bottom beam and ends at the top beam, covering exactly 400 mm. The operating range of 0.3 m to 20.0 m is the distance between emitter and receiver; at the short end, 0.3 m minimum keeps you from needing a deflector for very close mounting, while the 20 m maximum covers long conveyor or gantry perimeters. Temperature range of -30 °C to 55 °C is wide enough for unheated warehouse or cold-room installations, though the IP67G oil-resistance rating is the more relevant limit in a wet environment — verify that any cutting oil or solvent is compatible with the polycarbonate front window.
Because this is an active Omron safety component, the normal procurement path is through the authorized channel. We source it against an RFQ — confirm quantity and required delivery window, and we will quote firm pricing and lead time from the factory pipeline. No surplus or broker risk on this one.