SKU: SENS-4318
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Generic Reed Switch 2×14mm Normally Open Magnetic Sensor (Pack of 10)

₹91.00 (Inclusive of all taxes)
Out of Stock

This 2×14mm Normally Open (NO) Reed Switch is a magnetically controlled, hermetically sealed switch ideal for non-contact sensing in Arduino, Raspberry Pi, and industrial control projects. It closes its contacts when exposed to a magnetic field, providing a reliable, low-power switching solution.

Features

  • Normally Open (NO) contact configuration for fail-safe operation.
  • Compact glass-encapsulated design with 2mm diameter and 14mm length.
  • High switching capacity: 300 VDC / 0.55 A maximum ratings.
  • Wide operating temperature range from -50°C to +140°C.
  • Hermetically sealed contacts ensure reliable operation in various environments.

Out of stock

Description

The Reed Switch operates on a simple magnetic principle: two ferromagnetic reeds inside a sealed glass tube are drawn together to close the circuit when an external magnetic field is applied. Upon removal of the field, the reeds separate, opening the circuit. This hermetically sealed construction protects the contacts from dust, moisture, and oxidation, ensuring long-term reliability.

With a maximum switching voltage of 300 VDC and a current rating of 0.55 A, this switch is suitable for low-power signal switching and detection circuits. Its high insulation resistance and robust design make it a dependable component for position sensing, security systems, and proximity detection in both prototyping and industrial applications.

Key Features

  • Normally Open (NO) Configuration: Contacts remain open without a magnetic field, closing only upon exposure.
  • Hermetically Sealed Glass Enclosure: Protects internal ferrous contacts from environmental contaminants.
  • High Voltage & Current Rating: Supports switching up to 300 VDC and 0.55 A for versatile circuit integration.
  • Extended Temperature Range: Operates reliably from -50°C to +140°C for use in harsh conditions.
  • Low Contact Resistance: Approximately 20mΩ ensures minimal signal loss and power dissipation.
  • Long Mechanical Life: Rated for approximately 100,000 operational cycles.
  • Fast Response Time: Maximum operate time of 0.45 ms enables quick detection.
  • Compact & Lightweight: Minimal footprint (2mm dia. x 14mm length) and low mass for space-constrained designs.

Applications

  • Door and window position sensing in security and alarm systems.
  • Non-contact limit switches in robotics and automated machinery.
  • Liquid level detection in tanks using float-mounted magnets.
  • Bicycle speed and cadence sensors using wheel-mounted magnets.
  • Reed relay and low-power circuit switching applications.

Technical Specifications

Model / TypeReed Switch, Normally Open (NO)
Contact ConfigurationNormally Open (NO)
Glass Body Dimensions2mm Diameter × 14mm Length
Total Lead LengthApprox. 45mm
Max Switching Voltage300 VDC
Max Switching Current0.55 A
Max Contact Rating10 W
Min Breakdown Voltage150 VDC
Contact Resistance≈ 20 mΩ
Insulation Resistance100 MΩ
Operate Time≤ 0.45 ms
Frequency100 Hz
Mechanical/Electrical Life≈ 100,000 cycles
Operating Temperature-50°C to +140°C
Approx. Unit Weight1 g

Frequently Asked Questions

What is the difference between Normally Open (NO) and Normally Closed (NC) Reed Switches?

A Normally Open (NO) reed switch has contacts that are open (non-conducting) when no magnetic field is present. The circuit closes only when a magnet is brought near. A Normally Closed (NC) switch is the opposite: contacts are closed without a magnet and open when a magnetic field is applied. This NO variant is ideal for fail-safe detection where circuit closure indicates the presence of a magnet.

What is the maximum switching current and voltage for this reed switch?

This reed switch is rated for a maximum switching voltage of 300 VDC and a maximum switching current of 0.55 Amps. Exceeding these ratings can cause contact welding or arcing, leading to switch failure. It is designed for low-power signal and control circuits, not for directly switching high-power loads like motors.

How do I interface this reed switch with a microcontroller like Arduino?

Connect one reed switch lead to a digital input pin on the Arduino and the other lead to ground. Use a pull-up resistor (e.g., 10kΩ) connected between the input pin and 5V to ensure a defined HIGH state when the switch is open. When a magnet brings the contacts together, the pin will be pulled LOW, which can be detected in your code. Ensure your circuit voltage does not exceed the switch's 300 VDC rating.

What is the operating temperature range and environmental durability?

This reed switch operates reliably within a temperature range of -50°C to +140°C. Its hermetically sealed glass envelope protects the internal ferrous contacts from dust, moisture, and corrosion, making it suitable for use in a variety of indoor and protected outdoor environments. However, it is not submersible and should be protected from direct physical impact.

Package Includes

  • 10 x Reed Switch (2×14mm, Normally Open)

Additional Information

Weight 0.03 kg