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There is not enough information provided to answer. KVA is short for "Kilo Volt Amperes". That is, thousands of Volt Amps. In order to determine how many Amperes are flowing, you must know at what voltage it is operating.

Amperes = 45,000 ÷ volts

Bill Slugg

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16y ago
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12y ago

Assuming your 480v are 3 phase, it is 54 amps. Since it is not a branch circuit, you cannot increase to 60 amps for your breaker; you must size DOWN to 50 amps.

480v single phase, which would be strange, is 93 amps and you size down to 90.

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7y ago

125 amps at 208V and 108 amps at 240V for a 45 kva three-phase transformer.

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11y ago

KVA is the combining two values. Volts and amps. Without the output voltage a calculation can not be made. The formula you should use is I = W/E. Amps = 45000/Volts.

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Q: How many output amps is a 45 kva transformer?
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