Does a MC4 or Amphenol connector work with 8 AWG size wire?

    I want to use 8 AWG size wire for a solar install and I wondering if I can use MC4 or Amphenol connectors to connect to the size #8 wire?   Thanks.


    Neither MC4 or Amphenol connectors are UL approved for 8 AWG size wire.  Their rating are for:

    Locking system
    Temperature range 17A (1,5mm²; 14AWG)
    22A (2,5mm²; 12AWG)
    30A (4mm²; 10AWG)
    1000V (IEC/CEI)
    600V (UL)
    -40°C...+90°C (IEC/CEI)
    -40°C...+75°C (UL)

    We hear stories of installers using both the MC4 and Amphenol connectors to connect to 8 AWG wire but to be clear they are not UL approved for this application.
    Marina Lee commented 9 months ago

    Dear Jeff,

    I came across your question and would like to let you and anyone interested know that Staubli (formerly Multi-Contact) does offer a UL certified connector for termination of 8AWG wire.

    Here are some of the specs and you can find more details in our catalog (page 19):
    Plug connector: PV-KBT4/8II-UR, P/N 32.0080-UR
    Socket connector: PV-KST4/8II-UR, P/N 32.0081-UR
    Rated voltage: 1500Vdc
    Rated current: 70A
    Contact resistance: less than 0.25 mOhm
    Ingress protection: IP65/ IP68 (mated), IP2X (unmated)
    Ambient temperature range: -40C to +85C (UL)
    Upper limiting temperature: 105C (IEC)
    Certified for altitudes of up to 5000m above sea level

    Link to catalog download:…

    I hope this information helps (even though the question was posted several years ago).

    Kind regards,
    Marina Lee
    PM Alternative Energy

    10 years ago
    Asked by
    Jeff Ramsay
    Support topics
    System sizing
    Wiring and circuits
    Support tags
    wire sizing