Reed Switch Large 20mm – Magnetic Proximity Sensor

The Reed Switch (Large 20mm) is a highly sensitive and durable magnetic proximity sensor used for detecting the presence or absence of a magnetic field. When brought near a magnet, the switch activates by opening or closing its internal contacts, making it one of the simplest and most reliable switching components.

This reed switch is widely used in door sensors, security alarms, smart home automation, and electronic circuits. Its compact 20mm glass-encapsulated body ensures durability and consistent performance.

Compatible with Arduino, NodeMcu, Raspberry Pi, and other microcontroller platforms, it is ideal for hobbyists, engineers, and product developers needing a low-power, contact-based magnetic detection system.

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✨ Key Features

• Magnetic proximity switch

• 20mm glass body for durability

• Fast switching response

• Normally Open (NO) operation

• Low power consumption

• Works with Arduino, NodeMcu, Raspberry Pi

• Ideal for DIY projects, security systems, automation

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🔧 Technical Specifications

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🛠 Applications

Home & Security Systems

• Door and window magnetic sensors

• Alarm trigger systems

• Smart home automation

Industrial & Automation

• Position sensing

• Proximity detection

• Machine safety locking

DIY Electronics Projects

• Arduino magnetic sensor circuits
  👉 https://electroway.org/product-category/arduino-and-accessories/arduino-boards/

• NodeMcu IoT detection projects
  👉 https://electroway.org/product-category/iot-and-smart-solutions/iot-modules/nodemcu/

• Robotics limit switches & detection systems

• Magnetic counter systems

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⚠ Precautions

• Avoid bending or applying force on glass capsule.

• Keep away from strong mechanical vibrations.

• Use a proper pull-up resistor when interfacing with microcontrollers.

• Do not expose the switch to strong heat sources.

• Use within rated voltage/current to avoid contact damage.

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🔗 Internal Category Links

• Electronics Components: https://electroway.org/product-category/electronics-components/

• Tools & Accessories: https://electroway.org/product-category/tools-and-accessories/

• Arduino & Accessories: https://electroway.org/product-category/arduino-and-accessories/

• ICs: https://electroway.org/product-category/ics/

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🎥 YouTube Tutorial Video

Watch Video:https://www.youtube.com/shorts/parNm9pB5Yw

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4. Product Summary

The 20mm Reed Switch is a compact, durable magnetic proximity sensor perfect for security, automation, and DIY electronics. It delivers fast switching, long life, and excellent compatibility with Arduino, NodeMcu, and Raspberry Pi systems.