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Murphy 0-300 PSI Direct Mount Pressure Switch PSB-300-F75

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Murphy 0-300 PSI Direct Mount Pressure Switch with 75 PSI Factory Preset - Plated Steel - PSB-300-F75

Product Condition: NEW
Murphy Direct Mount Pressure Switch 300 PSI with Factory Preset of 75 PSI PSB-300-F75
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

SSL Cerficate

The Murphy 0-300 PSI Direct Mount Pressure Switch PSB-300-F75 is a direct mount switch for critical pressure points. It has one limit contact that can be used to activate an alarm, actuate indicator lights or shutdown equipment. The construction of this instrument is the same as our time-proven Swichgage instrument. A precision machined brass mounting plate and port captures a high quality stamped beryllium copper diaphragm. The single-pole, double-throw (SPDT) snap-switch is operated directly from the diaphragm for quick acting and positive switching. Trip point is factory preset according to your specifications.

Housing is weather sealed to prevent entry of moisture, dust, etc. A glass-filled nylon terminal block with quick screw terminal connections gives the PSB switch a real advantage in industrial engine applications. The PSB is ideal when reading is not desired, but pressure is critical to operational efficiency. Intended for use in general purpose nonclassified areas.



  • Fits all engine applications
  • SPDT snap-switch
  • Activates indicator lights, alarms, or shut down equipment
  • Time-proven SWICHGAGE construction
  • Easy wiring terminal block
  • Steel housing specially coated to resist corrosion
  • Factory preset to your specifications
  • Applications: Engine Lubrication • Water pumps • Compressors • Oil field systems • Irrigation systems • Construction Equipment • Mobile Equipment • Marine engines • Generators



  • Part No.: PSB-300-F75
  • Pressure Range: 0-300 psi
  • Factory Preset: 75 psi
  • Maximum Pressure: 500 psi
  • Housing: Plated steel
  • Pressure Connection: 1/8-27 NPT, Brass
  • Diaphragm: Formed beryllium copper (heat treated)
  • Pulsation Dampener: Brass (it is removable for cleaning)
  • Terminal Block: Three #4-40 screws
  • Accuracy: Trip point: ±3% of full scale
  • Switch reset differential: ±7% of full scale - Repeatability: ±1% of full scale
  • Contact Rating: SPDT 3 A @ 30 VDC inductive
  • Temperature Range: Ambient= -40°F (-40°C) thru 150°F (66°C); Process= -40°F (-40°C) thru 250°F (121°C)
  • Contact: falling pressure
  • Shipping Weight: 8 oz. (0.25 kgs)
  • Shipping Dimensions: 3 x 2-3/4 x 2-3/4 in. (76 x 70 x 70 mm)

Additional Information

Product Condition NEW
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