MC-38 Door Window Sensor Magnetic Switch Home Alarm System

MC-38 Door Window Sensor Magnetic Switch Home Alarm System serves as a fundamental security component for detecting the unauthorized opening of doors, windows, or drawers. This wired sensor utilizes a high-quality reed switch that remains closed when the accompanying magnet sits in close proximity. Consequently, when someone opens the door and moves the magnet away, the circuit breaks and triggers an alarm signal. Furthermore, the low-profile white housing ensures the device blends seamlessly with most home or office decors. Therefore, you can easily integrate this reliable, cost-effective sensor into any DIY security project or professional monitoring system to enhance perimeter safety.

Key Features:

• Normally Closed (NC) Operation: The circuit remains complete when the magnet is near the switch, providing a fail-safe trigger for most security panels.
• High-Sensitivity Reed Switch: Features a premium magnetic contact that ensures consistent performance and long-term durability over thousands of cycles.
• Self-Adhesive Backing: Includes pre-applied double-sided tape, which allows for quick and tool-free installation on smooth surfaces.
• Compact Design: The small footprint enables discrete placement on narrow frames where larger sensors might not fit.
• Durable ABS Housing: Constructed from flame-retardant ABS plastic to protect the internal components from mechanical impact and environmental dust.

Technical Specifications:

• Switch Type: Normally Closed (NC)
• Operating Voltage: ≤ 100 V_DC
• Maximum Current: 0.5 A
• Load Power: 10 W
• Actuation Distance: ≈ 15 mm to 25 mm (Sensing Gap)
• Connecting Wire: 24 AWG (Approx. 25 cm length)
• Service Life: ≥ 1,000,000 operations

Mechanical Specifications:

• Housing Material: High-grade ABS Plastic
• Color: Standard White
• Mounting Method: Surface Mount (Adhesive or Screw)
• Terminal Type: Pre-soldered tinned wires

Dimensions:

• Sensor Body: ≈ 27 mm x 14 mm x 8 mm
• Magnet Body: ≈ 27 mm x 14 mm x 8 mm
• Wire Length: ≈ 300 mm

Pinout and Wiring:

• Wire 1 (White): Connect to the Signal/Input pin of the alarm controller or microcontroller.
• Wire 2 (White): Connect to the Ground (GND) or Common terminal of the circuit.
• Installation Note: Align the sensor and magnet so they are parallel. However, ensure the gap between them does not exceed 10 mm when the door is closed for the most reliable detection.

Datasheet Reference:

• Download MC-38 Magnetic Switch Datasheet

Commonly Used in:

• Burglar Alarm Systems: Serving as the primary entry point detector for wired security consoles.
• Arduino/ESP32 Projects: Providing digital input for smart home automation and “Open/Closed” status logging.
• Industrial Cabinets: Monitoring access to sensitive control panels or equipment enclosures.

Applications:

• Perimeter Security: Monitoring main entrance doors and ground-floor windows for intrusions.
• Smart Lighting: Automatically turning on interior closet or pantry lights when the door opens.
• Safety Interlocks: Ensuring machine guards or protective covers remain closed during operation.

Equivalent Models:

• MC-31: A similar surface-mount sensor with a slightly different housing profile.
• RC-33: A recessed version of the magnetic reed switch for hidden installations inside door frames.
• Honeywell 943: An industrial-grade equivalent offering similar NC switching characteristics.

Package Includes:

• 1 x MC-38 Wired Magnetic Sensor (Switch Part)
• 1 x Matching Magnetic Block