The power system unit 51404174-375 consists of:

(1) 51404170-175 power supply housing
(2) 51198947-100 or 51109684-100 silver power supplies.
(1) 51303948-100 48v battery tray assembly with (4) batteries.

Model number (MC-PSRX04) 51404174-275 DOES NOT include the 48v battery tray assembly.