Voltaris / Jefferson Electric
Find your transformer size and catalog number.
Enter the phase, voltage and measured current. Choose whether the amps were measured on the 480 V / 600 V primary supply or on the secondary load. The calculator returns the next listed kVA size and its Jefferson catalog number.
Sizing result
How the calculation works
Single-phase: kVA = volts × amps ÷ 1,000.
Balanced three-phase: kVA = line-to-line volts × line amps × √3 ÷ 1,000.
The selected primary or secondary voltage is used to match where the current was measured. The result rounds upward to a size and catalog number listed on catalog page 1-4 or 2-4. Full-load currents are nominal calculations excluding losses. Motor starting, harmonics, unbalanced loading, installation conditions and protection require application review.
Formula reference: Schneider Electric · Voltaris official website