Viair 110-150 PSI Pressure Switch with 40A Relay

Max Load of 40 Amps & 1/8" NPT


10 reviews


The direct replacement pressure switch for our 232-5485K horn kits and onboard air systems, the Viair 110-150 PSI pressure switch with 40A relay is rugged and easy to install pressure switch that has a 40 amp relay built-in to increase longevity and decrease install time. The Viair 110-150 PSI pressure switch with 40A relay will automatically turn your compressor on when the pressure in your air tank falls below 110 PSI and will automatically turn your compressor off when the pressure reaches 150 PSI, delivering a switch-free and worry-free onboard air experience. The Viair 110-150 PSI 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.

Compatible With

Use With The Following To Run At 105 PSI:

  • Viair 275C (Part Number: AC-275)
  • Viair 280C (Part Number: AC-280)
  • Viair 325C (Part Number: AC-325, AC-325C)
  • Viair 330C (Part Number: AC-330, AC-330IG)
  • Viair 350C (Part Number: AC-350, AC-350C)
  • Viair 400C (Part Number: AC-400, AC-400C)
  • Viair 450C (Part Number: AC-450, AC-450C, AC-350IG)

May Be Used As A Replacement With:

  • 150 PSI Shocker train horn kits (part numbers: HK-S4-***)
  • 150 PSI AirChime train horn kits (part numbers: HK-P3-5**, HK-P5-5** HK-K3-5**, HK-K5-5**)
  • 150 PSI Outlaw train horn kits (part numbers: HK-C3-***, HK-C3B-***, HK-C3M-***)
  • HornAir 150 PSI onboard air systems (part numbers: HA-***)
  • Viair 150 PSI onboard air systems (part numbers: AS-****)
  • Moisture resistant
  • Built-in 40 amp relay
  • Viair 110-150 PSI pressure switch with built-in relay
  • Part Number: PS-150R
  • Ports: 1x ⅛″ NPT male
  • Turn-Off Pressure: 150 PSI
  • Restart Pressure: 110 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

4.8 Based on 10 Reviews
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Easy installation

Pressure switch arrived and when I lowered the spare tire delete, the old switch was right there. Maybe the easiest swap I've ever done.


Having A Blast Again!

Like always, when it's working correctly, we have a BLAST!!!!!



always a pleasure dealing with you guys


Replacement part

AGAIN! The customer service was fantastic and they helped me out every step and this was a replacement for the one I broke


Great product but

It works well but didn't last as long as I thought it would. Probably going off-road didn't help with the longevity but it's a lifted truck and I'm a Southern kind of man so I couldn't resist. With it being the right price and works like it should, I would keep buying and still recommend it.