Littelfuse : Small Profile, 14mm Reed Switches (MACD-14 / MASM-14) with Close Differential

MACD-14 and MASM-14 sub-miniature reed switches are ideally suited to position, proximity and float position sensing for liquid level measurement and industrial controls.

MACD-14 (leaded) and MASM-14 (surface mount) are sub-miniature, normally open switches with a 14.00mm long x 2.28mm diameter (0.551” x 0.090”) glass envelope capable of switching 200VDC at 10W with close differential. Available sensitivity range is 10AT to 30AT. The reed switches have a high insulation resistance of 1010Ω minimum and a low contact resistance of less than 100mΩ. These devices are ideally suited to position, proximity, float position sensing for liquid level, industrial controls, office equipment, home appliances, and telecom applications.


  • Capable of switching 200VDC or 0.5A at up to 10W
  • Normally open switch
  • Low close/open hysteresis (close differential)


  • Position sensing
  • Level sensing
  • Security
  • Industrial controls
  • Office equipment
  • Home appliances


  • Hermetically sealed switch contacts are not affected by and have no effect on their external environment
  • Zero operating power required for contact closure
  • Excellent for switching microcontroller logic level loads