Purpose of 110V 3 phase?

Hi,

I have taken over a design engineering job for industry.

The design is using a 400V/110V transformer. Usually, the 110V is single phase. However, in this case it is giving 110V 3 phase 32A.

The 110v 3 phase is for use with 4P 110V socket to run a pump.

Being in the UK, I am used to seeing 110V single phase for this application.

Can someone explain why the 3phase option will have been chosen instead?

Any diagrams will be welcomed.

Thank you

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