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Definition of "MVA interrupting rating" |
the interrupting rating of a device expressed in terms of mega-volt-amperes. The conversion between fault volt-amps and fault current in three phase systems is VA = 1.73 — operating RMS line-line voltage — largest phase fault current expressed in RMS symmetrical amperes. Power circuit breakers can have separate MVA and maximum current interrupting ratings, with adjustments when the circuit breaker is operated below rated voltage. |
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