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  1. #1
    Join Date
    Jan 2007
    Location
    Brisbane
    Posts
    2

    Default Curious about ratings on circuit breakers etc

    I have a RCD with 25amp 30mA 3kA written on it. I have another RCD with 10kA written on it. I'm familiar with the first two ratings, but does anybody know what the kA rating actually reflects as 3000amp and 10000amps both seam like very large figures. Is this the lifetime rating of the device or something?

    Any information will be greatly appreciated... i'm very curious!

    Many thanks,

    Dan.

  2. #2
    Join Date
    May 2004
    Location
    Melbourne, Australia
    Posts
    0

    Default

    The third figure is the "Interrupt Rating" - how much current the device can safely break and remain intact.

  3. #3
    Join Date
    Mar 2007
    Location
    Adelaide South Australia
    Posts
    76

    Default

    thanks I often wondered about that myself

  4. #4
    Join Date
    Jan 2007
    Location
    Brisbane
    Posts
    2

    Default

    many thanks chrisp... it all makes sense now!

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