Transformer Full Load Current in Amps, Three Phase Circuits

To find the full load current in amps for your transformer in a 3 phase circuit, use your transformer's kVA Rating and Voltage and the equation or chart below.

Full Load Amps Equation for 3 Phase Circuit

Three Phase kVA = Volts x Amps x 1.73 / 1000

Full Load Amps Chart for 3 Phase Circuit

kVA
Rating		 208V 240V 480V 600V
3.0 8.34 7.23 3.61 2.89
9.0 25.01 21.68 10.84 8.67
15.0 41.69 36.13 18.06 14.45
30.0 83.37 72.25 36.13 28.90
45.0 125.06 108.38 54.19 43.35
75.0 208.43 180.64 90.32 72.25
112.5 312.64 271.95 135.48 108.38

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Ventilated 3 Phase Transformer

ventilated three-phase transformer

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Enclosed 3 Phase Transformer

enclosed three-phase transformer

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Warning: When using this information to perform electrical work, call a licensed electrician and consult the NEC® for safety. All licensed electricians have passed examinations covering the National Electric Code®, know state and local building codes, and may carry insurance to cover damages