22mm Reed Switch Sensor Magnetic Switch

22mm Reed Switch Sensor Magnetic Switch

A Reed Switch (22mm Magnetic Sensor) is an electromechanical switch operated by a magnetic field. It consists of two ferromagnetic metal contacts (reeds) sealed inside a small glass tube (≈22 mm length) filled with inert gas.

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• Operation Principle: When a magnet is brought near, the reeds become magnetized and attract each other, closing the circuit (ON). When the magnet moves away, the reeds separate, opening the circuit (OFF).
• Size: 22 mm length (commonly used in general-purpose sensing).
• Contact Type: Normally Open (NO), Normally Closed (NC), or Changeover (SPDT) depending on version.
• Actuation Distance: Typically a few millimeters to a couple of centimeters, depending on magnet strength.
• Electrical Rating: Usually low current (0.5A – 1A), up to ~100V AC/DC (varies by manufacturer).
• Encapsulation: Glass tube, often protected with plastic casing in sensors.

Applications

• Door & Window Sensors: Used in security systems to detect opening/closing.
• Proximity Sensing: Detects magnetic fields in automation or robotics.
• Position Detection: Senses moving parts in machinery (e.g., limit switch).
• Consumer Electronics: Flip covers in phones/tablets (screen auto ON/OFF).
• Automotive: Detects brake pedal, gear lever, or door position.
• Metering & Counters: Flow meters, gas meters, and utility meters use reed switches to detect rotations.
• DIY & Hobby Projects: Widely used with Arduino, Raspberry Pi, and microcontrollers for contactless sensing.

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