Seco-Larm SM-4601-L3Q Industrial Wide-Gap Magnetic Contact Switches (Pack of 4), 3" Operation Gap NO/NC, Open/Closed Loop (3 Wires)

‌Wide 3-Inch Sensing Gap: Reliable operation even with significant spacing or misalignment between sensor and magnet. NO/NC Output (3-Wire): Supports both open and closed loop systems for flexible installation and integration with most alarm or access control systems. Durable Construction: Built for industrial environments with rugged housing and dependable performance. Versatile Mounting: Surface-mount design allows for quick and secure installation on various door or gate types.