Definity 631DB1 AC Power Unit

The Definity 631DB1 AC Power Unit:
 
Accepts 120 VAC 60Hz and produces -48 VDC at 8A and -5 VDC at 6 A available on the carrier backplanes.
 
The -48 VDC also supplies power to the cabinet fans.
 
If AC input power fails, the unit converts 144 VDC from the optional batteries in the AC power distribution unit to -48 VDC and -5 VDC.