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Viair 93940 40 Amp Air Compressor Relay for 12 Volt compressor , Black

4.7 4.7 out of 5 stars 558 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Automotive Replacement Air Conditioning Compressor Relays by VIAIR
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1 Count (Pack of 1)
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Purchase options and add-ons

Connector Type Quick Connect
Contact Material Silver Nickel
Current Rating 40 Amps
Mounting Type Chassis Mount
Brand VIAIR

About this item

  • 40 Amp 12v Relay with Mounting Tabs
  • Four 1/4 inch spade post connectors
  • Handles up to 40 amperes maximum ampere draw in applications
  • Each compressor must have its own relay for a proper installation
  • Mounting tab for relay molded into moisture resistance relay case

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 6 x 6 x 5.5 inches; 0.8 ounces
  • Item model number ‏ : ‎ 93940
  • Date First Available ‏ : ‎ June 1, 2006
  • Manufacturer ‏ : ‎ VIAIR
  • ASIN ‏ : ‎ B000YC7GBU
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.7 4.7 out of 5 stars 558 ratings

Product Description

Viair 40 ampere four-post relay for all 12-volt applications.

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
558 global ratings

Customers say

Customers like the performance, quality and value of the relay. For example, they mention it works well, is heavy duty and has durable switches. Some appreciate the good price.

AI-generated from the text of customer reviews

22 customers mention22 positive0 negative

Customers are satisfied with the performance of the relay. They mention that it works well, is heavy duty, and has no issues. Some say that it has been used for a year and shows no signs of failing.

"...Popped this one in and it works good as new again." Read more

"...Fit perfectly and my compressor works perfectly now" Read more

"I have 2 and they work flawlessly" Read more

"Works great" Read more

18 customers mention16 positive2 negative

Customers like the quality of the relay. They mention it's a high-quality, heavy-duty product, and durable switches. Some say that it'll last a long time with no issues and is a great replacement relay for anyone with an air lift performance system.

"These are a great replacement relay for anyone with an air lift performance system...." Read more

"...Other than that looks like a high quality relay compared to the other ones I've got from EBay and such." Read more

"...I expect this to last a long time with no issues." Read more

"...Heavy duty and up to now no issues. I'm sure they will provide years of trouble free service." Read more

7 customers mention7 positive0 negative

Customers appreciate the value of the relay. They mention that it has a good price and fast shipping.

"Great price. I have ran Viair compressors for a couple years without problems...." Read more

"Great price, fast shipping" Read more

"Great price" Read more

"Product was exactly as described and at a fair price. Thanks!" Read more

4 customers mention4 positive0 negative

Customers are satisfied with the service provided by the relay. They mention that it provides years of trouble-free service and that it solved their problem immediately.

"good service and product" Read more

"...Heavy duty and up to now no issues. I'm sure they will provide years of trouble free service." Read more

"Worked perfectly and solved my problem immediately" Read more

"Great service and products..." Read more

Working great
5 Stars
Working great
No problems so far. Wired in for use with air system in a pickup toolbox. Florida heat inside a metal box haven't killed them yet.
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Top reviews from the United States

Derek B.
5.0 out of 5 stars Plug & play for ARB air compressor
Reviewed in the United States on January 11, 2024
Size: 1 Count (Pack of 1)Verified Purchase
My ARB single-stage compressor under my hood was super intermittent. The original relay had been in there for about 6 years. Popped this one in and it works good as new again.
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Eden Milam
5.0 out of 5 stars Great price
Reviewed in the United States on April 10, 2024
Size: 1 Count (Pack of 1)Verified Purchase
Needed this style and this is about half price of local and a good brand.
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Amazon Customer
5.0 out of 5 stars Perfect for Air Lift systems
Reviewed in the United States on January 26, 2023
Size: 1 Count (Pack of 1)Verified Purchase
These are a great replacement relay for anyone with an air lift performance system. We've all been there when something goes weird just to find out the relay is bad. Quick switch out and direct fit.
2 people found this helpful
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mr_robot
4.0 out of 5 stars Other than that looks like a high quality relay compared to the other ones ...
Reviewed in the United States on January 14, 2016
Size: 1 Count (Pack of 1)Verified Purchase
Not entirely the vendors fault but please note that this is a 4 prong/post relay. It's missing the center connection so can't use it for my application.

Other than that looks like a high quality relay compared to the other ones I've got from EBay and such.
One person found this helpful
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Al
5.0 out of 5 stars It works!
Reviewed in the United States on December 21, 2023
Size: 1 Count (Pack of 1)Verified Purchase
It does its job.
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Matthew Harnden
5.0 out of 5 stars Exactly what I needed
Reviewed in the United States on March 12, 2022
Size: 1 Count (Pack of 1)Verified Purchase
I got this to replace the one on my ARB Air compressor. Fit perfectly and my compressor works perfectly now
4 people found this helpful
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NewGold
5.0 out of 5 stars It will either work or it won’t.
Reviewed in the United States on May 29, 2023
Size: 1 Count (Pack of 1)Verified Purchase
It will either work or it won’t.
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Mitch owen
5.0 out of 5 stars Good
Reviewed in the United States on March 19, 2023
Size: 1 Count (Pack of 1)Verified Purchase
Ok
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Top reviews from other countries

s w
5.0 out of 5 stars As described and good value for the price.
Reviewed in Canada on December 1, 2015
Size: 1 Count (Pack of 1)Verified Purchase
Simple, inexpensive robust (40 amps). I use it to run my bilge pump to cut down on burning out bilge pump switches. I have used other realys for this purpose, the all seem to work OK, but this was a very good price and most other relays are only 30 amps. I don't know if there is really a difference, but will go with the specs. arks are arks, the bigger the contacts the longer they last. Of course with all of this kind of stuff, until it has been in for a few years we really don't know do we? But it looks good so far.
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nick minnema
5.0 out of 5 stars These are perfect I'd order again
Reviewed in Canada on February 19, 2022
Size: 1 Count (Pack of 1)Verified Purchase
Came quickly and worked perfect
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John
5.0 out of 5 stars Works good
Reviewed in Canada on October 6, 2017
Size: 1 Count (Pack of 1)Verified Purchase
Been on for almost a year now and still works fine, plastic mounting tabs usually worry me but this one is sturdy.
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Wreckerdan
5.0 out of 5 stars A+
Reviewed in Canada on December 21, 2018
Size: 1 Count (Pack of 1)Verified Purchase
Great product
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GMF
4.0 out of 5 stars No issues
Reviewed in Canada on October 4, 2016
Size: 1 Count (Pack of 1)Verified Purchase
Seems fine
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