MC-38A Wired Door Window Magnetic Sensor Reed Switch NC/NO

MC-38A Wired Door & Window Magnetic Sensor Switch

Keep your home, office, or commercial space more secure with the MC-38A Wired Magnetic Reed Switch. This compact, reliable door and window sensor is designed to integrate seamlessly into wired alarm systems, triggering alerts whenever a door or window is opened or closed. Made in Mainland China, it delivers consistent performance at an excellent value.

Key Specifications

• Model: MC-38A
• Switch Withstand Voltage: 60VDC
• Load Current: 150mA
• Dimensions: 27 × 14 × 8 mm
• Actuating Distance: 18mm ± 10mm
• Wire Length: 24AWG, approx. 350mm
• Switch Output: Normally Open (NO) — closes when magnet is near; or Normally Closed (NC) — opens when magnet is near
• Installation Method: Surface-mount via screws or double-sided tape
• Material: Durable plastic housing
• Package Includes: 1 complete set (sensor + magnet)

How It Works

The MC-38A uses a reed switch mechanism — a small internal metal reed that responds to a nearby magnet. There are two configurations available:

• Normally Open (NO): The reed contacts remain open when no magnet is present. When the magnet (mounted on the door or window frame) comes close, the contacts close, completing the circuit.
• Normally Closed (NC): The reed contacts remain closed when no magnet is present. When the magnet approaches, the contacts open, breaking the circuit and triggering the alarm.

Features & Benefits

• ✅ Compact & Discreet: Small form factor fits neatly on doors and window frames without being obtrusive.
• ✅ Easy Installation: Mount with screws or double-sided tape — no specialist tools required.
• ✅ Durable Construction: Pressure-resistant, impact-resistant, and corrosion-resistant for long service life.
• ✅ Stable Performance: Reliable switching operation across thousands of cycles.
• ✅ Wide Compatibility: Suitable for wooden doors, windows, cabinets, and more. Works with most wired home alarm control panels.

Applications

The MC-38A is ideal for a wide range of settings including:

• Residential homes and apartments
• Hotels and guesthouses
• Shopping malls and retail stores
• Warehouses and storage facilities
• Offices and commercial premises

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Frequently Asked Questions

Q: What is the difference between a Normally Open (NO) and Normally Closed (NC) reed switch sensor?

A: A Normally Open (NO) magnetic reed switch keeps the circuit open when no magnet is nearby. When the magnet comes close (e.g., door closes), the contacts close, completing the circuit. A Normally Closed (NC) switch keeps the circuit closed when no magnet is present; when the magnet approaches, it opens the circuit. The right choice depends on how your alarm system is wired and whether it triggers on a circuit open or circuit close signal.

Q: How do I install the MC-38A door/window sensor?

A: Installation is straightforward. Mount the sensor body on the door or window frame and the magnet on the moving door or window leaf, aligning them within the 18mm actuating distance. You can use the included screw holes or apply double-sided tape for a non-invasive install. Connect the two wires to your alarm control panel's zone input terminals.

Q: What types of doors and windows is the MC-38A compatible with?

A: The MC-38A magnetic door sensor is primarily recommended for wooden doors and windows, but its compact size and surface-mount design make it adaptable to most door and window types found in homes, offices, hotels, warehouses, and retail environments.

Q: What alarm systems is this wired magnetic sensor compatible with?

A: The MC-38A works with virtually any wired alarm system or control panel that accepts a dry-contact (reed switch) zone input at low voltage (up to 60VDC, 150mA). Always verify your alarm panel's zone input specifications before connecting.

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.