Viair 90-120 PSI Pressure Switch with Leads


  • This pressure switch is essential to the operation of any 12 or 24-volt air compressor. The switch turns the compressor on automatically when your pressure drops below 90 PSI and then off again once you reach 120.

    This pressure switch is rated for both 12 and 24-volt applications making it perfect for automotive or marine use. The switch is rated for 10,000 cycles and is extremely durable.

    We recommend purchasing a relay with this pressure switch when using it with an air compressor. By installing a relay you can alleviate the burden of the compressor from the pressure switch, ensuring an even longer lifespan!

  • Recommended For Use With The Following:

    • Viair 100C (Part number: AC-100)

    May Be Used As A Replacement With:

    • 120 PSI Train Horn Kits (Part number: HK-S4-V127)
    • 120 PSI Air Horn Kits (Part number: HK-B2-V127, HK-B3-V127, HK-B4-V127)
    • Viair 120 PSI Air Source Unit (Part number: AS-127S)
    1. High Accuracy
    2. Perfect For 12 or 24 Volt Applications
    3. Pre Wired for Easy Installation
    1. One Viair 90/120 PSI Pressure Switch
    1. Part Number: PS-120S
    2. Ports: 1x ⅛″ NPT male
    3. Turn-Off Pressure: 120 PSI
    4. Restart Pressure: 90 PSI
    5. Voltage: 12 or 24 Volts DC
    6. Max Amps: 30 Amps


This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to

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