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Premium Grade Weco 917A61 AC220 Elevator Light Curtain for Commercial Elevator Systems. High-Speed Response: Features 45ms relay output and 21ms transistor output for rapid detection. Wide Detection Range: Operating distance up to 4 meters with detection height up to 1841 mm. Fault Redundancy: Allows one emitter to be masked after a fault, ensuring system continuity. High Light Immunity: Resists interference with 100,000 Lux light immunity for stable performance. Factory Direct Sales: Professional manufacturer offering direct sales with quality assurance. Flexible Payment: Accepts T/T, Paypal, Western Union, and L/C for convenient transactions. Fast Delivery: Large inventory ensures shipment within the fastest day from contract signing.