20mm 2 Pin Reed Switch Magnetic Sensor Normally Open Glass Type Mini Reed Switch (20mm Reed Switch)

The 20mm reed switch is a compact magnetic sensor designed to detect the presence of a magnetic field and provide a simple switching output. It consists of sealed ferromagnetic contacts inside a glass tube and operates as a passive device without external power.

Key Features -

• 20mm miniature glass reed switch
• 2 pin normally open SPST contact type
• Fast response to magnetic field
• Zero power consumption passive operation
• Hermetically sealed construction for long life
• High sensitivity magnetic detection

Specifications -

• Sensor type - magnetic reed switch
• Contact type - normally open SPST
• Glass length - approx 20mm
• Switching voltage - approx 3.3V to 24V typical
• Switching current - up to approx 0.5A to 1A max
• Contact resistance - low resistance when closed
• Operating mode - magnetic proximity switching

Applications -

• Door and window magnetic sensing
• Security alarm systems
• Position detection in machines
• Counting and speed sensing systems
• Industrial automation and IoT devices

Pinout Configuration -

• Pin 1 - reed contact terminal
• Pin 2 - reed contact terminal

Working Principle -

The reed switch contains two ferromagnetic contacts sealed inside a glass envelope. When a magnetic field is applied the contacts attract and close the circuit and when the magnetic field is removed they return to open state. This enables reliable non contact switching for sensing applications.