{"product_id":"mc-38a-wired-magnetic-door-window-sensor-nc-no-reed-switch-alarm","title":"MC-38A Wired Magnetic Door Window Sensor NC\/NO Reed Switch","description":"\u003ch2\u003eMC-38A Wired Door \u0026amp; Window Magnetic Sensor Switch\u003c\/h2\u003e\n\u003cp\u003eKeep your home, office, or commercial space more secure with the \u003cstrong\u003eMC-38A Wired Magnetic Door\/Window Sensor\u003c\/strong\u003e. This compact reed switch sensor works with virtually any wired alarm system, triggering an alert the moment a monitored door or window is opened. Available in both \u003cstrong\u003eNormally Open (NO)\u003c\/strong\u003e and \u003cstrong\u003eNormally Closed (NC)\u003c\/strong\u003e configurations, it integrates seamlessly into new or existing security setups.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Output Options:\u003c\/strong\u003e Supports both Normally Open (NO) and Normally Closed (NC) operation — choose the configuration that fits your alarm controller.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Discreet:\u003c\/strong\u003e Slim 27 × 14 × 8 mm housing blends into door and window frames without drawing attention.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Mount with screws or double-sided tape (SMD method) — no specialist tools required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReliable Reed Switch Technology:\u003c\/strong\u003e Magnetically actuated contacts offer stable, consistent performance over a long service life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Pressure-resistant, impact-resistant, and corrosion-resistant plastic housing built to last.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Ideal for wooden doors, windows, cabinets, and more — suited for homes, hotels, shopping malls, warehouses, and hospitals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMC-38A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSwitch Withstand Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e150 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e27 × 14 × 8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActuating Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18 mm ± 10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWire Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~350 mm (24 AWG)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSwitch Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNormally Open (NO) \/ Normally Closed (NC)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eScrew or double-sided tape (SMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 × Sensor Set (switch body + magnet)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eThe sensor consists of two parts: the \u003cstrong\u003ereed switch body\u003c\/strong\u003e (mounted on the door frame) and the \u003cstrong\u003emagnet\u003c\/strong\u003e (mounted on the moving door or window). When the door or window is closed, the magnet holds the reed contacts in their default state. When the door or window opens, the magnet moves away, changing the switch state — signalling your alarm panel to trigger an alert.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Open (NO):\u003c\/strong\u003e Contacts are open with no magnet present; closing when the magnet is near. Circuit completes when the door\/window is shut.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Closed (NC):\u003c\/strong\u003e Contacts are closed with no magnet present; opening when the magnet approaches. Circuit breaks when the door\/window is shut.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplication Ideas\u003c\/h3\u003e\n\u003cp\u003eThis sensor is a versatile addition to any wired security or automation project:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHome entry doors and windows\u003c\/li\u003e\n  \u003cli\u003eHotel room and emergency exit doors\u003c\/li\u003e\n  \u003cli\u003eWarehouse and storage room monitoring\u003c\/li\u003e\n  \u003cli\u003eShopping mall and retail security systems\u003c\/li\u003e\n  \u003cli\u003eDIY Arduino \/ Raspberry Pi home automation projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/balashov-2500w-handheld-steam-cleaner-kitchen-car-home\"\u003eBALASHOV 2500W Handheld Steam Cleaner – Kitchen, Car \u0026amp; Home\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between the Normally Open (NO) and Normally Closed (NC) reed switch configurations?\u003c\/h4\u003e\n\u003cp\u003eA: A \u003cstrong\u003eNormally Open (NO)\u003c\/strong\u003e reed switch has contacts that remain open (circuit incomplete) when no magnet is present, and close (circuit completes) when a magnet is brought near. A \u003cstrong\u003eNormally Closed (NC)\u003c\/strong\u003e reed switch is the opposite — contacts remain closed when no magnet is present, and open when a magnet approaches. Choose the configuration that matches your alarm controller's input requirements.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I install the MC-38A magnetic door\/window sensor?\u003c\/h4\u003e\n\u003cp\u003eA: Installation is straightforward. Attach the \u003cstrong\u003ereed switch body\u003c\/strong\u003e to the door frame and the \u003cstrong\u003emagnet\u003c\/strong\u003e to the door or window itself, aligning them within the 18 mm (±10 mm) actuating distance. You can secure both parts with the included screws or use double-sided tape for a tool-free, non-invasive mount. Connect the two wires from the sensor to your alarm panel or controller.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the MC-38A sensor compatible with DIY alarm and smart home systems?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The MC-38A is a simple wired magnetic reed switch that outputs a contact closure signal, making it compatible with most wired alarm panels, DIY microcontroller projects (Arduino, Raspberry Pi), and home automation controllers that accept a dry contact or digital input.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What surfaces or door types can this sensor be used on?\u003c\/h4\u003e\n\u003cp\u003eA: The MC-38A is recommended for \u003cstrong\u003ewooden doors and windows\u003c\/strong\u003e, but its compact size and flexible mounting method make it suitable for a wide range of door and window frame materials. Avoid mounting on thick metal surfaces, as ferromagnetic materials can interfere with the magnetic field and affect the actuating distance.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between the Normally Open (NO) and Normally Closed (NC) reed switch configurations?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A Normally Open (NO) reed switch has contacts that remain open (circuit incomplete) when no magnet is present, and close (circuit completes) when a magnet is brought near. A Normally Closed (NC) reed switch is the opposite — contacts remain closed when no magnet is present, and open when a magnet approaches. 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Avoid mounting on thick metal surfaces, as ferromagnetic materials can interfere with the magnetic field and affect the actuating distance.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"MC-38A Wired Magnetic Door Window Sensor NC\/NO Reed Switch\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/products\/mc-38a-wired-magnetic-door-window-sensor-nc-no-reed-switch-alarm\"}]}\u003c\/script\u003e","brand":"Axl","offers":[{"title":"A2 Normally open","offer_id":44137086550103,"sku":"14:193#A2 Normally open","price":11.61,"currency_code":"USD","in_stock":true},{"title":"A1 Normally closed","offer_id":44137086582871,"sku":"14:771#A1 Normally closed","price":7.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/6008\/7383\/files\/S77ed465af8f847a98d96c0b1b08f1c46W_d39c3658-397a-42f3-9929-6d399c4e95c9.webp?v=1786445350","url":"https:\/\/axlcustomersupport.com\/products\/mc-38a-wired-magnetic-door-window-sensor-nc-no-reed-switch-alarm","provider":"Axl","version":"1.0","type":"link"}