HP RM3-7278-000CN is a low-voltage power supply part for compatible HP printers. It is identified as the 110V version, intended for printer models listed for this part number.
The listed compatible models include HP Color LaserJet Enterprise M455dn and Color LaserJet Enterprise MFP M480f, as well as HP Color LaserJet Managed E45028dn and Color LaserJet Managed MFP E47528f. This part provides the low-voltage power supply function within those printer systems.