Seco-Larm SM-4601-L3Q Industrial Wide-Gap Magnetic Contact Switches (Pack of 2), 3" Operation Gap NO/NC, Open/Closed Loop (3 Wires)

‌3-inch operation gap for reliable performance on loose-fitting or industrial doors 3-wire configuration allows for NO/NC operation (open or closed loop) Suitable for use with alarm systems, access control, and automation Durable construction for industrial environments Easy surface-mount installation