MC-38A Wired Door Window Magnetic Sensor Switch NC/NO Reed
MC-38A Wired Door Window Magnetic Sensor Switch NC/NO Reed
MC-38A Wired Door & Window Magnetic Sensor Switch
Keep your home, office, or business secure with the MC-38A Wired Magnetic Door/Window Sensor Switch. This compact reed switch supports both Normally Open (NO) and Normally Closed (NC) configurations, making it a versatile component for home alarm systems, security panels, and automated setups. Easy to install and built to last, it's an ideal entry-level security upgrade for doors and windows of all types.
Made in Mainland China.
Key Features
- Dual NC/NO Output: Compatible with both normally open and normally closed alarm system configurations for maximum flexibility.
- Compact & Discreet: Slim 27×14×8 mm body fits neatly on door and window frames without standing out.
- Easy Installation: Mount via screws or double-sided tape (SMD method) — no special tools needed.
- Durable Construction: Plastic housing offers pressure resistance, impact resistance, and corrosion resistance for long-lasting performance.
- Reliable Reed Mechanism: Actuates within an 18 mm (±10 mm) range; rated for up to 60 VDC and 150 mA load current.
- Wide Application: Ideal for homes, hotels, shopping malls, warehouses, hospitals, and more.
Technical Specifications
- Model: MC-38A
- Material: Plastic
- Withstand Voltage: 60 VDC
- Load Current: 150 mA
- Dimensions: 27 × 14 × 8 mm
- Actuating Distance: 18 mm ± 10 mm
- Wire: 24 AWG, approx. 350 mm length
- Switch Output: Normally Open (closes when magnet is near) / Normally Closed (opens when magnet is near)
- Installation: SMD — screws or double-sided tape
- Recommended For: Wooden doors, windows
- Package Includes: 1 × Sensor Set
- Country of Origin: Mainland China
How It Works
The MC-38A uses a two-part magnetic reed mechanism: a sensor unit and a magnet. When the magnet (attached to the moving door or window) comes within range of the sensor (mounted on the frame), the internal reed contact either opens or closes depending on your chosen configuration. Your alarm or automation system detects this change and triggers its programmed response — keeping you instantly informed of any unauthorized entry.
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Frequently Asked Questions
Q: What is the difference between Normally Open (NO) and Normally Closed (NC) on the MC-38A magnetic sensor switch?
A: A Normally Open (NO) reed switch keeps its contacts open when no magnet is nearby and closes the circuit when a magnet approaches. A Normally Closed (NC) reed switch does the opposite — its contacts are closed by default and open when a magnet comes near. The MC-38A supports both modes, so you can wire it to match your alarm or automation system's requirements.
Q: How do I install the MC-38A wired door/window sensor switch?
A: Installation is straightforward. Attach the sensor unit to the door or window frame and the magnet to the door or window itself using either the included screw holes or double-sided tape. Align both parts so they face each other within the 18 mm actuating range when the door/window is closed. Connect the 24 AWG wires to your alarm control panel and configure the NC or NO setting as needed.
Q: What types of doors and windows is the MC-38A magnetic switch compatible with?
A: The MC-38A is recommended for wooden doors and windows, but its compact, surface-mount design makes it adaptable to a wide variety of door and window frame materials. It is widely used in residential homes, hotels, shopping malls, hospitals, warehouses, and other commercial or security applications.