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Is terminal X0 used when reverse feeding a transformer?

No, X0 should not be used. Please see the excerpt from our catalog below for more information.

"Three-phase transformers with either delta-delta or delta-wye configurations can also be reverse connected for step-up operation. When reverse feeding a delta-wye connected transformer, there are two important considerations to take into account: (1) The neutral is not connected, only the three-phase wires of the wye system are connected, and (2) the ground strap between X0 and the enclosure must be removed. Due to high inrush currents that may be created in these applications, it is recommended that you do not reverse-feed transformers rated more than 75 kVA. The preferred solution is to purchase an Eaton step-up transformer designed specifically for your application."

Link to Excerpt in Catalog