The Centurion 3/1 UPS series provides outstanding protection in applications where only limited three phase power is available yet a large single phase power supply is necessary. In applications where a balanced load is essential, the 3/1 Series has all of the features of the Centurion Tower Range with the added ability of accepting three phase power to its input. It can also be configured to be a single phase in and single phase out UPS. No batteries but includes internal charger.