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Reed Switches

Reed switches open and close circuits based on signals received from magnetic sensors. The electromechanical switches themselves often form integral components of liquid level sensors used in industrial controls, coolant systems, and air conditioners. When signaled, a normally open switch closes a circuit to initiate an automated process or trigger an alarm. Littelfuse makes a broad array of reed switches in bare glass and overmolded packages. Each of our liquid level sensing reed switches works with a floating actuator magnet and is engineered to withstand harsh operating conditions.
  • Switching power ratings from 5 W to 50 W
  • Switching voltage ratings from 170 V dc to 250 V dc
  • Switching current ratings from 250 mA to 1 A
  • Broad range of sensitivity (AT) ratings
  • RoHS compliant
  • Miniature and subminiature packages
  • Surface mount versions available
  • Versions with changeover contacts instead of normally open contacts available

Reed Switches Parts

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Reed Switches Applications

three electricity meters with green digital screens
Electricity Meters

Smart electricity meters give building managers insight into and control over energy use. Littelfuse makes the solid state relays,

garage door with silver car showing
Automated Doors & Gates

Automatic doors and gates make buildings more accessible and improve security. Consult this block diagram to find Littelfuse components that help

Silver motorbike charging
2/3-Wheeler Energy Storage

Look to Littelfuse for overcurrent and overvoltage protection of energy storage devices in two- and three-wheeler EVs. This block diagram

A white charger with blue lighting indicating that it is charging
EV Wireless Chargers

Depend on Littelfuse to deliver reliable electronics solutions for each component of a wireless charging system for electric cars, buses, and

finger touching white sensor
Door & Window Sensors

Door and window sensors networked with alarm systems improve building security. View this block diagram to identify Littelfuse electronic

Gas water meter
Gas & Water Meters

Smart gas and water meters promise to give building managers important tools to lower utility bills and increase safety. The flow meters can only

Highlights Section

  • Automatic test equipment
  • HVAC/R
  • Door and window latches and alarms
  • Industrial controls
  • Liquid level sensors
  • Telecommunications equipment, especially line switching

Reed Switches Resources

Reed Switches Featured Products

Reed Switches Custom Products Request

Need your Reed Switches customized? Please let us know about yourself and your project needs, and a Littelfuse expert will be in touch about customizing our product(s) for you.

Please fill in the form below and we will be happy to help you with your request.

Please give a brief description of the product you would like to design and the application for which it will be used.