What rating of circuit breaker to be used in 100KW load,3phase,440 volts at 80% PF? please show the solution.?

a load of 100KW, .8PF,3phase, 440 volts.

1 Answer

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  • Gary H
    Lv 6
    1 decade ago
    Best Answer

    To solve for apparent power,

    PF = kW/kVA ==

    kVA = kW/PF ==

    kVA = 100/.8 = 125;

    Then apparent current will be

    125,000/440/SQRT(3) = 164A

    "Standard" breaker sizes vary by country - pick one that is at least 20% higher than 164A available to you. I'd say 200A.

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