12mm Reed Switch Sensor Magnetic Switch

12mm Reed Switch Sensor Magnetic Switch.

A 12mm reed switch is a compact, cylindrical glass-encapsulated component that opens or closes an electrical circuit in the presence of a magnetic field. It is activated by a permanent magnet and does not require external power to operate.

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Key Specifications:

• Body Length: ~12mm (glass tube)
• Diameter: ~2mm
• Material: Glass housing, ferromagnetic contacts
• Contact Rating: Typically 10W to 50W
• Switching Voltage: Up to 100–200V DC (varies by model)
• Switching Current: Typically up to 0.5A
• Operate Distance: 5–30mm depending on magnet strength
• Operating Temperature: -40°C to +125°C (varies)

How It Works:

• Inside the glass tube are two ferromagnetic reeds (metal strips).
• When a magnet approaches, the reeds either come together (close the circuit) or separate (open the circuit), depending on the switch type.

Common Uses:

• Door/window sensors in security systems
• Proximity sensing in industrial automation
• Position detection in appliances
• Robotics and DIY electronics
• Liquid level detection (in float switches)

Advantages:

• No power consumption
• Long life (millions of operations)
• Reliable and fast switching
• Simple, low-cost solution

*product image for illustration purposes only. actual product may vary.