Recessed Door Contact Sensor (Normally Open NO) Key benefits Compatible with any access control or burglar alarm system — integrates easily into existing security setups. Recessed, lowprofile design fits into door or frame for discreet monitoring and cleaner installation. Compact size and short cable make it simple to install in tight spaces and on framemounted or panelmounted doors. Precise detection with a 15–25 mm action distance for reliable open/close sensing at normal door gaps. Main features and specifications Current: 0.1 A Voltage: 200 V Power rating: 2 W Action (detection) distance: 15–25 mm Cable length: 25 cm (9.8') Total size: 32 mm × 11 mm (1.26' × 0.43') (L × D) Design: recessed contact for concealed installation Compatibility: works with any access control or burglar alarm system available Operation (Normally Open NO) NO behavior: when the magnet is separated, the circuit is conductive (indicator light on). When the magnet is together, the circuit is not conductive (indicator light off). This behavior is suitable for systems that require a conductive output when the door or window is open. Practical applications Residential security: monitor doors or windows and connect to a home alarm panel to trigger alerts when openings are left ajar or forced open. Commercial access control: use with card readers or door controllers to detect door status for secure entry logging and interlocking doors. Cabinets and enclosures: discreetly secure server racks, equipment cabinets, or storage compartments where visible sensors are not desirable. Installation notes Recessed mounting reduces visibility and exposure; plan hole placement and wiring routing to accommodate the 25 cm cable length. Confirm the 15–25 mm action distance aligns with your door/frame gap for reliable triggering. Follow your alarm or access control system wiring conventions when connecting to ensure correct NO operation. This sensor provides a compact, compatible, and unobtrusive solution for detecting door and window status in a variety of security and accesscontrol applications.