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Commonly used terms in the Electrical industry.
ampere interrupting rating
the interrupting rating of a device expressed in amps (often rms symmetrical amps).
See
MVA interrupting rating
interrupting rating
for a circuit breaker, fuse, or switch, the maximum fault level that the device can safely interrupt. The interrupting rating can be expressed in terms of amps or volt-amps.
MVA interrupting rating
the interrupting rating of a device expressed in terms of megavolt-amperes. The conversion between fault volt-amps and fault current in three-phase systems is VA = 1.73 x operating RMS line-line voltage x 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.