Purpose and benefits Reliable magnetic contact switch for monitoring metal doors and windows. Detects open/closed states and sends a clear signal to access control or antitheft alarm systems. Durable zinc alloy housing resists rust and provides strength for longlasting outdoor or industrial use. Normally Open (NO) operation makes wiring and integration simple for systems that expect a closed circuit when the sensor is separated from the magnet. Key specifications Body size (approx.): 106 × 16 × 16 mm (L × W × H) Cable length: 260 mm (10.2') Action distance: 30–50 mm (1.2'–2') Wiring: Normally Open (NO), 2 wires Package includes: 1 pair How it works (NO type) When the switch is separated from the magnet, the circuit is conductive (light on). When the switch is close to the magnet, the circuit is not conductive (light off). Use the two wires to connect to your access control or alarm input according to your system's wiring scheme. Why choose this switch Compact profile (106 × 16 × 16 mm) fits narrow frames and rolling door profiles. Zinc alloy housing provides better rust resistance than typical plastic housings, making it suitable for metal doors and harsher environments. Action distance up to 50 mm offers flexible mounting positions and reliable triggering. Compatibility and applications Designed for use with access control systems and antitheft alarm systems. Specifically suited for metal doors and windows, including rolling/roller doors and metal shutters. Example use scenarios 1. Commercial storefront: Install on a metal roller shutter to trigger an alarm or send a status signal to an access control system when the shutter opens. 2. Warehouse loading area: Mount on large metal rollup doors to monitor door position remotely and integrate with central security monitoring. 3. Residential metal gate or window: Use on metalframed windows or gates to detect forced entry or indicate open/closed status to a home alarm panel. Notes for installation Confirm your alarm or access control input expects a Normally Open contact. Mount the magnet and switch so they align within the 30–50 mm action distance for correct operation. Package includes 1 pair (typically one magnet and one switch).