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Magnetic contact switch (door sensor)
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A magnetic reed switch encased in an ABS plastic shell, commonly used to detect when a door, window, or drawer is opened. The switch half contains a normally...
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A magnetic reed switch encased in an ABS plastic shell, commonly used to detect when a door, window, or drawer is opened. The switch half contains a normally-open reed contact, and the other half is a magnet. When the magnet is within 13 mm (0.5"), the reed switch closes, completing the circuit.
Key Features
- Normally Open – Closes when the magnet is within 13 mm
- ABS Plastic Housing – Durable enclosure for both halves
- Mounting Tabs – Screw holes for secure installation
- Two-Wire Connection – Simple integration with any microcontroller or alarm system
Ideal For
- Door and window open/close detection
- Drawer and cabinet monitoring
- Security and alarm systems
- Home automation triggers
Tip: Double-sided foam tape from a hardware store works well for mounting without screws.
Package Contents
- 1× Reed switch half (with wires)
- 1× Magnet half
- Mounting screws
Jargon buster
Plain-language definitions for the technical terms used above.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- Reed switch
- A small switch sealed in glass that opens or closes when a magnet is nearby. It is useful for simple door, lid, wheel, or position sensing because it can detect motion without needing to be pressed directly.
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