GT250-480 units that have the dual power supply (manuf > 2012) have a backup 48VDC power supply so loss of one
power supply will not shut the whole system down.
Units manufactured prior to 2012 may have had a dual power supply upgrade at some point.
Part # 0J-921-1017-07 is a single 48VDC power supply.
For units that are out-of-warranty, call for quote : 866-519-1470