Hamlin introduces new Reed Switches MACD-14 and MASM-14

Small profile, 14mm reed switches with close differential

MACD-14 and MASM-14 reed switches allow for smaller range of movement in proximity sensing

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 10-30 AT.  The reed switches have a high insulation resistance of 1010 ohms minimum and a low contact resistance of less than 100 milli-ohms.  These devices are ideally suited to position, proximity, float position sensing for liquid level, industrial controls, office equipment, home appliance, and telecom applications.


  • Sub-miniature, normally open switch
  • 14mm x 2.28mm (0.551” x 0.090”) glass envelope
  • Capable of switching 200 Vdc at up to 10 Watts
  • Switching current up to 0.5 Amps
  • Low close/open hysteresis (close differential)
  • 10¹º Ohms insulation resistance
  • Available sensitivity range 10-30 AT
  • RoHS compliant
  • UL Recognized Component for use in Hazardous Locations


  • Hermetically sealed switch contacts are not affected by and have no effect on their external environment
  • No minimum switching voltage or current
  • Low, stable contact resistance
  • Zero operating power required for contact closure
  • Fit and forget durability


Datasheet MACD-14

Product Page MACD-14

Datasheet MASM-14

Product Page MASM-14

See also

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