Pressure Switches
Fixed Setpoint Pressure and Vacuum Switches - Discontinued

PSW27, PSW28, and PSW29 Series

Pressure and Vacuum Switches, Compact Rugged Pre-Fixed Setpoint | PSW27, PSW28, and PSW29 Series

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  • UL Recognized, CSA Certified Up to 21 Amps
  • Fixed Setpoint
  • Pressure and Vacuum Models Available
  • 1/8 NPT, Center Spout or Radial Spout for 1/8 ID Tubing
  • Compact, Rugged Design


The PSW27, PSW28 and PSW29 Series have been discontinued. Some stock still remains; please check the specific item you are seeking to see if there is remaining inventory. Please see the Pressure Switch Product Finder or contact Omega Sales for possible alternatives.

These reliable compact single pole switches are used in pressure and vacuum applications where moderate accuracy is sufficient. The fixed setpoint is factory set.

Approvals: UL Recognized, CSA Certified, microswitches bear the ENEC and CE mark
Temperature Range: -10 to 75°C (14 to 167°F)
Setpoint Accuracy: ±10% of setting at 70°F
Note: Pressure settings may change over the temperature range.
Electrical: SPDT; 250 Vac, see table for Amp rating.
Electrical Connection: 6.35 mm (0.25") standard "Slide-On" male
Materials of Construction
   Body: Acetal
   Diaphragm: EPDM (Ethylene-Propylene Diene Monomer)
Pressure Connection
   PSW27: 1/8 NPT male
   PSW28: Center spout for 1/8" ID tubing. Provided with 9/16-18 mounting and tube lock nut
   PSW29: Radial spout for 1/8" ID tubing.Through hole legs for mounting bolt
Hysteresis (Dead Band)
   Pressure Switches: Approximately 25% of the setpoint
   Vacuum Switches: Approximately 30% of the setpoint
Media Compatibility: Liquids and gases compatible with EPDM and Acetal
Weight: 17 g (0.6 oz)
Overall Dimensions: 45 x 51 x 25 mm (1.75 x 2 x 1")
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