VIAIR 90111 pressure switch with relay for auto on/off at preset pressures in 12V systems
VIAIR 90111 pressure switch with relay for auto on/off at preset pressures in 12V systems

VIAIR 90111 Pressure Switch with Relay – 12V Auto On/Off at 110–145 PSI

Overview The VIAIR 90111 Pressure Switch with Relay is a compact, black control device designed for 12V...
Vendor: VIAIR
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VIAIR 90111 pressure switch with relay for auto on/off at preset pressures in 12V systems

VIAIR 90111 Pressure Switch with Relay – 12V Auto On/Off at 110–145 PSI

£51.29
VIAIR 90111 pressure switch with relay for auto on/off at preset pressures in 12V systems

VIAIR 90111 Pressure Switch with Relay – 12V Auto On/Off at 110–145 PSI

£51.29
Description
Description
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Overview

The VIAIR 90111 Pressure Switch with Relay is a compact, black control device designed for 12V air systems. It automates the on/off cycling of your air compressor by preset pressures, helping you avoid operating beyond the intended limit while keeping your setup tidy and efficient.

How it works

Configured to turn the compressor on at 110 PSI and shut it off at 145 PSI, this switch provides a reliable, pre-set cycling range. The built-in relay is designed to carry longer electrical loads, which can reduce wear on external switches and wiring while promoting smoother operation over time.

The unit connects through a straightforward 1/8 NPT M port, making it compatible with a variety of fittings and setups. Designed for 12-volt systems, it fits well with many automotive, off-road, and workshop configurations where space and simplicity matter.

Key benefits

  • Automatic on at 110 PSI, off at 145 PSI to maintain steady pressure
  • Built-in relay to handle longer loads and potentially extend component life
  • 12-volt system compatibility for common automotive and mobile setups
  • Easy connection via 1/8 NPT M port
  • Compact, low-profile design suitable for tight spaces

Why consider this for your system

If you rely on an air compressor for tires, tools, or vehicle upgrades, this switch offers a practical way to automate pressure management. The preset cycling range can help maintain performance without constant manual adjustments, while the built-in relay supports sustained operation under load. Use cases vary from on-board vehicle systems to portable shop setups where a compact control module can make a difference.

Practical uses

  • Vehicles with on-board air compressors requiring consistent cycling
  • Portable or stationary shop air setups needing a compact control unit
  • 12V systems that value automatic pressure regulation and reduced manual monitoring

FAQ

Q: What does the VIAIR 90111 pressure switch do?

A: It automatically powers the air compressor on at 110 PSI and off at 145 PSI to prevent over-pressurization.

Q: What are the installation and system requirements?

A: Designed for 12-volt systems and connects via a 1/8 NPT M port, with a built-in relay for longer load handling.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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