181P NEMA 4X and 13 Adjustable Vacuum Switch

adjustable vacuum switch, mechanical vacuum switch, low pressure vacuum switch
Compact, adjustable vacuum switch well suited to numerous applications. Our efficient Nega-Rate® Belleville disc spring offers superior set point stability and vibration resistance. The 181P series vacuum switch also has a selectable deadband feature which can be preset at the factory.


  • Electrical Listings: Switch listed by Underwriters Laboratories, Inc., CSA International and FM Approval
  • Electrical Connection: 1/2 NPT male conduit connection, 18" free leads
  • Pressure Connection: 1/4 NPT Female and 1/2 NPT Male
  • Temperature Range*
    • Ambient: -40°F to +176°F (-40°C to +80°C)
    • Media: -40°F to +300°F (-40°C to +149°C)
  • Adjustment: Internal, slotted adjustment wheel
  • Shipping Weight: Approximately 13 ounces
* Temperature limits change with O-Ring selection