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OEM Mechanical Pressure Switch for Indoor Applications

0.8 to 30 psi, fixed deadband
  • RoHS Icon
  • CE Approved
  • UKCA
  • UL cULus Recognized


Item# PSW-621

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-24 $159.89
25-49 $151.90
50-99 $148.70
100-199 $142.30
200+ $139.10

In stock

Lead Time (If not in stock): 3 weeks
0.8 to 30 psi, fixed deadband PSW-621 PSW-621
  • Watertight, Corrosion-Resistant Case
  • Thin Film Sensor for Long Stabile Life – Minimum 1 Million Cycles at Rated Load
  • Reliable in Industrial Environments
  • Field Adjustable

PSW-621 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

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

  • Contact Blocks 1 Amp Gold-Plated Contacts for TTL or Dry Contacts
  • repeatability ± 2% of max system pressure
Process Temp: -55 to 105°C (-65 to 221°F) 2% setpoint shift can occur below -23°C (-10°F) or above 52°C (125°F)
Repeatability: ± 2% of max system pressure
Cycling: Not to exceed 20 cycles/min
Warranty: 3 year/1 million cycles
Proof Pressure: 150% Max Pressure
Wetted Parts: 17-7 PH stainless steel, Loctite sealing compound #271, ZA8 alloy, chromate finish
Enclosure: Zinc alloy, chromate finish
Dimensions: 48 L x 28 mm Dia. (1.9 L x 1.1' Dia.)
Pressure Port: 1/8 -27 NPT Male
Electrical Connection: 300 mm (12') pigtail leads, 20 AWG, polyvinyl insulated
Wiring Code (pressure):
   Black = Common
   Red = N/C
   White = N/O
Wiring Code (vacuum):
   Black = Common
   Red = N/O
   White = N/C
Weight: 57 g (2 oz) (approx)
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Rated 3 out of 5 by from It works It works as advertised, but adjustment pressure setting is ballpark.
Date published: 2020-06-24
Rated 5 out of 5 by from Great compact switch I installed on a vacuum table and it was perfect for the box size and worked very well, also very easy to set. Great product.
Date published: 2016-04-28
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Can this be used on oxygen line

Asked by: Jabma
The PSW-620 cannot be used for oxygen.
Answered by: Applicatrions Engineer JK
Date published: 2023-11-28

what is the wiring for these used in nc operation

Asked by: josephs
Thank you for your question. The unit can be wired ether normally open or closed. The n/c is used mostly for decrease in pressure. Hope this was helpful
Answered by: application engineer je
Date published: 2022-01-04
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