The 3-Wire Reed Switch is a highly reliable, contact-based magnetic proximity sensor used to detect the position of a magnetic piston in pneumatic or hydraulic cylinders. Unlike 2-wire types, the 3-wire configuration provides a dedicated signal output wire, allowing for faster response, clearer signal separation, and compatibility with modern automation systems like PLCs, relays, and microcontrollers.

When a magnet embedded in the piston moves close to the reed switch (mounted externally along the cylinder body), the magnetic field activates internal reed contacts, triggering an NPN or PNP transistor output. This signal can then be used to control actuators, trigger alarms, or sequence machine operations.

3-wire reed switches are designed for DC voltage operation (typically 5V to 30V DC) and are built with integrated LED indicators, IP67-rated housings, and robust cables for industrial use. They are suitable for applications in automation, robotics, packaging, textile machines, and material handling equipment—especially where accurate and repeatable cylinder stroke detection is essential.

Key Features of 3-Wire Reed Switch:

⚙️ Electrical & Functional Features

• ✅ 3-Wire Configuration
  Includes separate wires for power, ground, and signal for precise and interference-free output.

• ✅ NPN / PNP Output Types
  Available in both logic formats for wide compatibility with industrial control systems.

• ✅ Digital Output Signal
  Switches cleanly between ON/OFF states based on magnetic field detection.

• ✅ Fast Response Time
  ≤ 1 millisecond switching—ideal for high-speed automation cycles.

Sensing Performance

• ✅ Magnetic Activation
  Senses proximity of piston magnet inside the cylinder.

• ✅ High Repeat Accuracy
  ±0.1 mm positional repeatability ensures consistent output.

• ✅ Non-Latching / Normally Open (NO) Options
  For standard actuation behavior.

Construction & Mounting

• ✅ Compact, Slim Profile
  Fits easily in T-slot, C-slot, round-slot, or tie-rod cylinders.

• ✅ Robust Housing Material
  Made from polyamide (PA), ABS, or metal—shock and vibration-resistant.

• ✅ LED Indicator
  Built-in LED shows status of ON/OFF signal for easy troubleshooting.

• ✅ Quick Mounting with Brackets or Clips
  Ensures easy installation and adjustment.

Cabling & Protection

• ✅ Cable Length: 2m or 3m standard (longer available)

• ✅ Cable Type: PVC, PUR, or high-flex depending on model

• ✅ Ingress Protection: IP67
  Dust-tight and water-resistant for harsh industrial environments.

Applications & Compatibility

• ✅ Pneumatic Cylinder Stroke Sensing
  Perfect for detecting extension/retraction positions.

• ✅ Works with ISO Cylinders:
  Compatible with ISO 15552, ISO 6432, and compact cylinder profiles.

• ✅ Ideal for Automated Systems
  Use with PLCs, relays, HMI panels, and more.

✅ Why Choose a 3-Wire Reed Switch?

• ✔️ Provides clean, accurate signal output for automated machine control

• ✔️ Compatible with modern PLCs and digital control inputs

• ✔️ Fast response and high accuracy ideal for high-speed motion tasks

• ✔️ Integrated LED for easy installation and diagnostics

• ✔️ Supports harsh environments with IP67 protection and durable housing

• ✔️ Available in multiple output types (NPN/PNP) for flexible integration