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    ETSNZ - What do the dual markings of standards on Acti9 MCBs refer to?

    For residential applications you use the standard IEC60898. You have 3 curves: B, C and D. These curves have maximum and minimum values for their limitation (In = rated current).
    B curve (3In to 5In)
    C curve (5In to 10In)
    D curve (10In to 14In)

    For industrial applications you use the standard IEC60947. These curves have an average value Ii with 20% tolerance . 
    Ii=3In+-20% (Z curve)
    Ii=4In+-20% (B curve)
    Ii=7In+-20% (C curve)
    Ii=12In+-20% (K curve)
    Ii=12n+-20% (MA curve, magnetic only)

    For the iC60 range, the devices are double standard - IEC60898 and IEC60947-2.
    The B and Ii=4In are Ii=4In+-20% (3.2In to 4.8In)
    The C and Ii=8In are Ii=8In+-20% (6.4In to 9.6In)
    The D and Ii=12In are D (10In to 14In)

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