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Most three phase Transformers have Delta primaries, with no neutral
Applies to LV Transformers by SquareD/Schneider Electric
Delta Primaries are inherently more stable
SquareD/Schneider Electric provides Wye primary on Delta secondary with center tap Transformers (T151 voltage code). The primary of this unit does not provide a terminal for a neutral. Connecting the primary of a Transformer to the neutral point of a Wye system can cause troublesome neutral currents during times of imbalance. Generally, it is best to select a Delta primary for most 3 phase applications, even when connecting to a Wye power system. Other than the T151 voltage code design, no wye primaries are offered by SquareD/Schneider Electric.
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