Magnetic Door Window Contact Sensor NO/NC Switch – 1 Pair
Magnetic Door Window Contact Sensor NO/NC Switch – 1 Pair
Magnetic Door & Window Contact Sensor Switch – NO/NC (1 Pair)
Keep your home, shop, or office secure with this high-sensitivity Magnetic Door & Window Contact Sensor Switch. Using reliable magnetic reed technology, this compact NO/NC contact switch instantly triggers your alarm system the moment a door or window is opened without authorization — giving you real-time awareness and peace of mind around the clock.
Made in Mainland China.
Key Features
- Instant Magnetic Detection: Leverages advanced magnetic induction technology to detect even the slightest movement, triggering your security system immediately when a door or window is opened unexpectedly.
- High Sensitivity: Extremely responsive reed switch mechanism detects small positional changes with precision, ensuring fast and reliable activation every time.
- Easy, Tool-Free Installation: No specialist tools or expertise required — simply follow the included instructions and have your sensor up and running in minutes, saving both time and cost.
- Broad Compatibility: Works seamlessly with a wide variety of home and commercial security systems, allowing integration with monitoring stations or security service centers for added protection.
- Multi-Scene Application: Ideal for homes, shops, offices, garages, warehouses, and controlled entry points — versatile enough to meet diverse security requirements in any setting.
- NO & NC Modes: Supports both Normally Open (NO) and Normally Closed (NC) configurations, making it flexible for different alarm system setups.
Specifications
- Material: Plastic
- Size: Approx. 5.5 × 1.4 cm / 2.17 × 0.55 in
- Switch Type: NO / NC Magnetic Reed Contact Switch
- Color: As shown in pictures
- Package Includes: 1 Pair (sensor + magnet)
Compatible Use Cases
- Residential front, back, and interior doors
- Windows and sliding glass panels
- Garage and warehouse entry points
- Shop and office doors
- Security control panels and alarm systems
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Note: Due to manual measurement, a tolerance of approximately ±5 mm may exist. Slight color differences between product images and the actual item may occur due to lighting conditions.
Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What is the difference between NO (Normally Open) and NC (Normally Closed) on this magnetic contact sensor?
A: In NO (Normally Open) mode, the circuit remains open when the magnet is near the sensor and closes when the magnet moves away — typically triggering an alarm. In NC (Normally Closed) mode, the circuit stays closed when the magnet is nearby and opens when separated, which is often preferred for fail-safe alarm systems. This sensor supports both configurations for maximum compatibility.
Q: Is this magnetic door sensor compatible with my existing home alarm system?
A: Yes — this magnetic contact sensor switch is designed for broad compatibility with most standard wired home and commercial security alarm systems. Simply connect the leads to your alarm panel's NO or NC zone terminals as required by your system.
Q: Can this sensor be used on metal doors?
A: Yes. This sensor is specifically designed to work with metal reed door and window frames. The magnetic induction mechanism functions effectively on metal surfaces, making it suitable for a wide range of door and window types including metal, wood, and composite materials.
Q: How difficult is it to install this sensor?
A: Installation is straightforward and requires no professional tools. Simply mount the sensor body on the door or window frame and the magnet on the moving door or window itself, align them so they face each other when closed, and connect the wires to your alarm system terminals following the included instructions.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.