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How is the capacity (kVA or amps of 120V power available) of the center-tap of a delta - center tapped delta Transformer calculated?

Center tap capacity of a center tapped delta secondary

Product Line:
LV Transformers

Applies to Transformers by SquareD/Schneider Electric

Center tap capacity must be calculated from the overall kVA capacity of the Transformer


The capacity of a delta - delta center tapped Tansformer`s center tap is simply 5% of the Transformer`s nameplate kVA capacity. For example, if the Transformer is an EE75T6HCT, which is a 75kVA device, the center tap capacity is 5% of 75kVA, or 3.75kVA. 3.75kVA at 120V calculates to 31.25 amps.  However, newer design Transformers by SquareD/Schneider Electric, such as an EE75T151HCT can have a center tap capacity of up to 30%, or 22.5kVA.  22.5kVA at 120V calculates to 187.5A.  For more details, see below attachment.

CTA-ID : 2026730

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