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Small rectangular pressure switch with 1/8 NPT male port and relay, matte finish

VIAIR

VIAIR 90111 Pressure Switch 110/150 PSI Accessory

SKU CH-TP4P-020G5

Pressure switch activates at 110 psi and deactivates at 150 psi with a relay for 12‑volt systems up to 40 amps

  • Reliable pressure control activates at 110 psi and stops at 150 psi
  • Direct 1/8 NPT male fitting simplifies air system installation
  • Built for 12-volt systems handling up to 40 amps
  • Moisture resistant design tested to last over 10 000 cycles
  • Compact 4.25 by 2.25 by 2.25 inch size fits tight mounting spaces

Product Identity

The VIAIR 90111 is a pressure switch designed for 12-volt mobile pneumatic systems. It controls compressor activation at 110 PSI on and 150 PSI off with a tolerance of plus or minus 5 percent. The unit includes an integrated relay rated up to 40 amps and a 1/8-inch male NPT port fitting. It is built for on-road and off-road air suspension or inflation setups.

Fitment Guidance

This switch suits builders assembling a 12-volt air system who need automatic pressure control within the 110 to 150 PSI range. It is not for 24-volt electrical architectures or for circuits that exceed the 40-amp relay limit. Buyers who require different cut-in or cut-out pressures, or who need a switch without an integrated relay, should look at other options.

Deciding Specification

The critical figure is the 110 PSI on and 150 PSI off pressure window with a 5 percent tolerance. If your air tank or suspension design demands a different activation band, this part will not regulate correctly. The 12-volt, 40-amp relay rating and 1/8 NPT thread are secondary constraints that must also match the system.

Highlights

  • Reliable pressure control activates at 110 psi and stops at 150 psi
  • Direct 1/8 NPT male fitting simplifies air system installation
  • Built for 12-volt systems handling up to 40 amps
  • Moisture resistant design tested to last over 10 000 cycles
  • Compact 4.25 by 2.25 by 2.25 inch size fits tight mounting spaces

Specifications

BrandViair

Questions about this item

How can I verify the pressure switch is activating at 110 psi and cutting off at 150 psi after installation?

The switch has a tolerance of +/-5% on the specified 110 psi on and 150 psi off points. Listen for the relay click at the lower pressure and confirm the compressor stops at the upper pressure using a calibrated gauge.

What components are included with the 90111 pressure switch and what must be purchased separately?

The unit includes the pressure switch with relay and a 1/8 male NPT port fitting. You will need to supply a 12-volt power source rated up to 40 amps, wiring, and any additional air line fittings for your specific system.

Is the 110/150 psi version suitable for a 24-volt air system or should I choose a different model?

This pressure switch is designed for 12-volt systems only, with a maximum current rating of 40 amps. It is not compatible with 24-volt applications, so a different model would be required for that voltage.

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