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Battery Deactivation Controlled by a Reed Sensor


When an automobile is completed at the factory, it is ready to be driven.  However, the vehicle may sit in a completion lot for several day or weeks awaiting transportation.  The vehicle is then transported either by truck all over the country or even sent overseas on a ship.  Once the vehicle arrives at its final destination it may sit for an extended period of time.  The entire process could add up to several months for which the vehicle has been sitting idle prior to being sold.   During that idle period, if the vehicle’s battery was connected it would have undergone small leakage currents that exist in any car.  These leakage currents would drain the battery, leaving the new owner with a car that won’t start.  Standex Electronics designers working with automotive engineers have solved these leakage current issues by using a magnetic Reed Sensor…

Full Application Write Up
Battery Deactivation - Reed Sensor



  • Cylindrical hole and screw fastening mounting
  • Contacts dynamically tested
  • Magnet and Reed Sensor are isolated and have no physical contact by typically having the Reed Sensor module mounted beneath the car windshield and the magnet is manually positioned over the module to accurately detect the magnet and deactivate the battery
  • Surface mount and through hole packages available
  • The magnet is not affected by its environment
  • The Reed Sensor operates reliably between -50°C and 150°C
  • The Reed Switch used in the Reed Sensor is hermetically sealed and is therefore not sensitive to rough, wet environments
  • Tens of millions of reliable operations


MK03 Reed Sensor

M03 magnet not included

MK14Dia40.157 MK14 Reed Sensor
MK18Dia50.197 MK18 Reed Sensor
MK20/1Dia2.720.107 MK20/1 Reed Sensor

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