Schneider Electric's latest Symmetra PX 250kW and 500kW
three-phase UPSes this year received a new firmware update,
giving the units a new ECO (economical operation) mode that
can deliver up to 99 percent power efficiency. ECO mode also
supports synchronization to an external AC source, the ability to
maintain full protection during maintenance procedures, as well
as remote display applications. The PX family now also features
Energy Star qualification.