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General Purpose Pressure Switches, In NEMA-4X Enclosures


Item# PSW-121

 This item is available for quick shipping
Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $248.43
10-24 $236.01
25-49 $231.04
50-99 $221.10
100-199 $216.13
200+ $211.17

In stock

Lead Time ( If not in Stock): 3 weeks

General Purpose Pressure Switches, In NEMA-4X Enclosures PSW-121 PSW-121
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  • UL Listed,
  • Ranges from 0.5 inH2O to 3000 psi
  • SPDT or DPDT Switches
  • Adjustment Lock
  • Safe, Easy Wiring Access

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Switch Type
Pressure Range
Pressure Type
Pressure Port Size
Pressure Port Type
Deadband Range

Product Specs

  • Enclosure Rating NEMA-4X
  • Maximum Ambient Temperature 70 {C} (158 {F})
  • Maximum Rating 15
  • Maximum Storage Temperature 70 {C} (158 {F})
  • Minimum Ambient Temperature -40 {C} (-40 {F})
  • Minimum Storage Temperature -55 {C} (-67 {F})
  • Other Features Manual Reset
  • Pressure Type Gauge
  • Pressure Units PSIG
  • repeatability +/-1% to +/-1.5% of Adjustable Range
  • Shock Setpoint repeats after 15 g
  • Vibration Setpoint repeats after 2.5 g

OMEGA's affordable, general purpose pressure switches offer distinct advantages over most similar style switches, including DPDT or adjustable deadband switches, as well as a wide selection of adjustable ranges from 0.5 inH2O to 3000 psi.

Approval: UL listed,
Storage Temperature: -55 to 70°C (-67 to 158°F)
Process Temperature:
   Stainless Steel: -55 to 205°C (-67 to 401°F)
   Phosphor Bronze: -40 to 150°C (-40 to 302°F)
   Buna-N: -25 to 95°C (-13 to 203°F)
Ambient Temperature: -40 to 70°C (-40 to 158°F), except models PSW-107 to PSW-117 and PSW-134 to PSW-139: -20 to 70°C (-4 to 158°F). Setpoint typically shifts less than 1% of range for a 30°C (54°F) ambient temperature change.
Shock: Setpoint repeats after 15 g, 10 ms duration.
Vibration: Setpoint repeats after 2.5 g, 5 to 500 Hz
SetPoint Repeatability: All models ±1% of adjustable range, except models PSW-118 to PSW-125 and PSW-132 to PSW-133 are ±1.5%
Switch Output: One SPDT or DPDT switch may be wired normally open or normally closed
Electrical Rating: Standard 15 A 125/250/480 Vac resistive External Manual Reset: 15 A 125/250 Vac resistive Double Pole Double Throw: 10 A 125/250 Vac resistive
Enclosure: Die cast aluminum (max. 0.6% copper). Epoxy-coated blue enclosure, gasketed, complies with NEMA-4X
Weight: Approximately 0.9 kg (2 lb)
Electrical Connection: 1/2 NPT and Two 7/8' diameter knockouts
Dimensions: 191 max H x 101 W x 60 mm D (7.5 max 4 x 2.3')

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What is the current rating of the contact at 24VDC for the PSW-120?

Asked by: Money4Nothing
The DC ratings for the PSW-120 pressure switches are as follows. 125VDC 0.5A Resistive, 0.03A Inductive 24VDC 2.0A Resistive, 1.0A Inductive Thank you and please feel free to contact us again if you have additional questions
Answered by: engineer rf
Date published: 2019-11-20
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