The combination ASIDCW20 20-A DIN rail dc-to-dc converter and dc UPS provides 960 W of power to any 12- to 48-Vdc industrial application. It monitors the voltage coming from a dc power supply and in the event of a power failure switches power to the backup battery source. During normal operation, the battery is kept charged by an integrated battery charger that supports various battery chemistries. The programmable keys or Powermaster software is used to set input and output voltages. The dc UPS function has the option of using one 12-V battery independently of the operating load voltage.