The Eaton 9155 is a Double-Conversion Online, Split-Phase UPS and requires a hardwired input connection of 200-240VAC with Neutral or with Optional Input Transformer Module. The optional input transformer module is used to provide a neutral connection for the UPS input when none exists in present building wiring. Output Voltage is 100/200, 110/220, 120/240 with 180° phase displacement or 120/208, 127/220 with 120° phase displacement.