MCM Electronics

40A Automotive 12V Relay By Multicomp (CMA31-DC12V-A) MCM Part #26-533

5 stars 8 reviews
MSRP: $4.95
You Save: $2.96 (60 %)
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Specifications Top

40A Automotive 12V Relay

These high current relays are commonly used for switching high current autosound, security, lighting and other custom applications. Mounting tab allows easy installation any place in the vehicle, even under the hood. 1/4" tabs accept standard female quick-disconnects or commonly used four and five pin OEM relay sockets.

  • Contact configuration: SPST
  • Contact current capacity: 40A
  • Coil voltage: 12VDC
  • Coil resistance: 85ohm
  • Current consumption: 145mA
  • Minimum pull–in voltage: 8.4VDC
  • Max release voltage: 1.2VDC
  • Dimensions: 1" (H) x 1" (W) x 1" (D) (less mounting tab)
    Part Numbers
    MCM Part #:26-533
    Multicomp Part #:CMA31-DC12V-A
    Package Specifications & Dimensions
    Weight:0.0698 lbs.
    Warranty:90 days
    Need to Return?
    Length:2.25 in.
    Width:1.25 in.
    Height:1.25 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No

Product Reviews Top

  • by vacfac

    on 3/6/2017

    Does well

    Overall: 4 out of 5

    Does what it's suppose to do.

  • by donvm99

    on 9/5/2012

    shipping costs too high

    Overall: 5 out of 5

    Shipping costs too high

  • by pharrand

    on 9/3/2012

    Good little relay

    Overall: 5 out of 5

    I've been using these for years. They work great. From polarity switching to ignition coil power up, they are great.

  • by keddie7

    on 5/14/2012

    Bosche type 5 pin relays

    Overall: 5 out of 5

    For the price they definitely work great, and are a steal. I've been using them for years with no problems.

  • by not4sale123

    on 4/20/2012

    Dan W

    Overall: 5 out of 5

    Great products

  • by grogerson28

    on 1/7/2012


    Overall: 5 out of 5

    Works very well

  • by badkarma

    on 10/6/2011

    User Review: MCM #26-533 - 40A Automotive 12V Relay

    Overall: 5 out of 5

    I have used hundreds of these relays for the custom relay systems I fabricate for classic VW's. After more than 3 years of use I have never had a failed relay. Highly recommended for any dry location use in 12V applications.

  • by garyfish

    on 2/26/2010

    High quality and unbeatable value!

    Overall: 5 out of 5

    I'd been looking for a reliable source for 12-VDC relays to use in a variety of electrical upgrading projects for my car -- e.g., installing fog lights, and re-wiring my headlights with heavier-gauge wires to accommodate brighter bulbs. These inexpensive but excellent-quality relays were just the ticket! They're about a quarter the cost of comparable relays on eBay and other discount outlets. And MCM also carries high-quality and very affordable relay sockets that are compatible with these relays. Thanks MCM!

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