Magnetic Door Window Contact Sensor Set NC Reed Switches for Reliable Security Alarm Detection

Normal Close NC Magnetic Door Window Contact Reed Switches 3 Sets Key benefits Reliable door and window monitoring: Normally closed (NC) contacts stay closed when the magnet is present and open when the magnet moves away, providing straightforward, failsafe detection for intrusion or position sensing. Simple integration: Standard reedswitch contacts and separate magnets allow easy wiring into alarm panels, home automation modules, and DIY electronics without complex configuration. Compact and unobtrusive: Lowprofile housings and small magnets mount discreetly on doors, windows, cabinets, or frames to preserve appearance while providing consistent monitoring. Low power and low maintenance: Passive mechanical contacts require no additional power for sensing and have long operational life when installed correctly. Main features Function: Normally closed (NC) magnetic reed switch design; contact opens when magnetic field is removed. Quantity: Supplied as 3 complete sets to cover multiple doors or windows. Mounting: Designed for surface mounting on doors, windows, or frames; includes separate switch and magnet components for flexible placement. Wiring: Standard twowire reed switch output compatible with common alarm and control inputs. Materials and construction: Compact plastic housings with internal glassencapsulated reed contacts and neodymium or ferrite magnets for dependable magnetic actuation. Performance: Mechanical contact switching provides clear open/closed signals for security and sensing applications. Why customers choose these switches Easy to install and wire into existing security panels or custom circuits. NC operation is preferred for many alarm systems because it can detect both contact opening and wiring faults. Small footprint and neutral appearance make them suitable for visible and concealed installations. Typical applications Home and office security: Monitor door and window positions as part of a wired alarm system or alarm inputs on security panels. Cabinet and equipment monitoring: Detect unauthorized access to server racks, tool cabinets, or storage enclosures. DIY electronics and automation: Use for position sensing in smarthome projects, garage door status, or machine safety interlocks. Installation tips Align magnet and switch so the magnet passes directly alongside the switch when the door or window closes for reliable activation. Keep recommended gap small and consistent for repeatable operation; test each installation by opening and closing the contact several times. Route and secure wiring to prevent strain on the switch housing and to reduce false triggers from vibration. What is included Three complete sets of normally closed magnetic door/window reed switches, each set containing one reed switch housing and one magnet. This product provides a straightforward, reliable solution for monitoring openings and positions where a normally closed magnetic contact is required.