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
    • Money Back Guarantee/Refund Policy
      All merchandise unless otherwise indicated may be returned within 30 days from the shipment arrival date for a refund. A Returned Merchandise Authorization (RMA) number is required for all returns. A 15% restocking fee may apply. Additional deductions may be made to reflect the products current market value. These terms apply to all refunds. Most products are shipped with a refund/replacement guarantee period unless otherwise noted in the product listing. Customers must inform of any order discrepancy within 7 days from the invoice date so that we may investigate and resolve the situation accordingly.
    • satisfaction guarantee offers our customers a 30-day satisfaction replacement or refund guarantee on all purchases, except when otherwise noted in the product listing.
    • Cross-Shipments will not cross-ship returned merchandise.
    • Physical Damage Policy
      Physical damage to any product purchased at will effectively void warranty coverage. Physical damage includes but is not limited to improper handling and/or any other type of damage sustained by irregular usage.


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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