Viair Pressure Switch with Built-In 40A Relay

Max Load of 40 Amps & 1/8" NPT


24 reviews
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The Viair 40 amp air compressor pressure switch with 40A relay is a rugged and easy to install pressure switch that has a 40 amp relay built-in to increase longevity and decrease install time. This pressure switch will automatically turn your compressor on when the pressure in your air tank falls below a certain pressure and will automatically turn your compressor off when the pressure reaches max pressure, delivering a switch-free and worry-free onboard air experience.

The Viair pressure switch with 40A relay has been tested to last 10,000 cycles with proper maintenance and features clearly labeled lead wires with insulated 1⁄4” male push-to-connect terminals.

    • Moisture resistant
    • Built-in 40 amp relay
    • Viair Pressure Switch w/ Built-in 40 Amp Relay
    • Part Number: PS-105R / PS-120R / PS-150R / PS-200R
    • Ports: 1x ⅛″ NPT male
    • Pressure Range:
      Part # Turn-Off Pressure Restart Pressure
      PS-105R 105 PSI 85 PSI
      PS-120R 120 PSI 90 PSI
      PS-150R 150 PSI 110 PSI
      PS-200R 200 PSI 165 PSI
    • Voltage: 12 Volts DC
    • Max Amps: 40 Amps
    • Length: 4.25″ (107.95 mm)
    • Width: 2.25″ (57.15 mm)
    • Weight: 1 lb (0.45 Kg)
    • 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.
    • Warranty
      This product is backed by Viair's one-year manufacturer's defect warranty!
    • 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.

    Warnings & Notices

    Safety warning icon

    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

    Customer Reviews

    4.9 Based on 24 Reviews
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    Filter Reviews:
    David W.
    United States United States

    Awesome product

    Insane loud ��

    Johnathan A.
    United States United States

    450 C compressor

    After eighteen year's my Viair compressor died so I purchased a new one and I'm back and running, the sales staff were very helpful and the price was right

    Troy H.
    United States United States

    Conductors Special

    This thing works Great!

    Juan S.
    United States United States

    Customer support is awesome!!

    Easy switch out, and new product works great.


    Make sure you install one of these

    The first one I bought did not work but the second it did work I did not buy it from Air Blast so don't think it was their fault but the first one I bought was bad so I came on here to get this one where I would have a warranty with it and it works like a champ

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