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Can a Buck & Boost Transformer be used to change 208 to 120/240 single phase?

Some applications require a 120/240V single phase supply with a neutral
Product Line:
LV Transformers
Applies to all SquareD/Schneider Electric Buck and Boost Transformers
Single phase Buck and Boost Transformers are usually connected as Autotransformers, and are able to supply two wire loads only.  They will not supply a neutral required for a 120/240V service
No. Buck & Boost transformers cannot be used to supply single phase, 3-wire loads. Use a 208 - 120/240 isolation transformer for these applications.

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