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Thread: Service Panel and Breaker Compatibility

  1. Default Service Panel and Breaker Compatibility

    Hi all. This is my first post here--what a great site!!.

    I'm fairly new to working with electricity and with home wiring, and want to make sure that my first foray inside the service panel is a safe and productive one.

    So, how does one ensure that a given circuit breaker is compatible with a given service panel?

    My panel has the logo with the capital letter D inside a box. The main label on the panel contains this information:

    QO COMBINATION
    LOAD CENTER
    CAT. QO-40M SER. T4
    200 AMP CU/AL


    3 other stickers inside the panel give the following information:

    Made in U.S.A.
    QOM200
    L3ON1
    40 degrees C

    Tighten to 250 lb. in.
    Serrer a 250 lb. po.
    #4 - 300 MCM CU/AL
    A7?031-609-01

    TYPE QOM2
    120/240 V. AC
    SQUARE D. CO.
    CSA


    The circuit breaker itself also has the logo of the capital D inside a square and, in various places:

    10 kA
    120/240v -
    Type QO
    Al/Cu
    UL listed C.B.
    AB-6056
    HACR
    TYPE/
    TIPO
    CARR

    That's all I can find--I've heard that an incompatible panel and breaker are fire hazards so I definitely wanted to check this out first. Thanks in advance for any help!

  2. #2
    Join Date
    Nov 2005
    Location
    SC
    Posts
    593

    Default

    Your panel will accept Square D type QO breakers only. These should be available at any hardware or big box retailer (Cutler Hammer also makes an appoved breaker for QO panels, but they are harder to find).

    Square D also makes a HOM type breaker that will not fit.

    The QO panel is considered by many to be the best available.

  3. #3

    Post

    Sounds like I have the right breaker for this panel, then.
    Thanks very much!

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