Dell 2FR04 is a 495W Delta power supply for supported Dell PowerEdge servers. It is identified as a redundant power supply, making it a replacement component for server power configurations designed to use this type of unit.
Dell lists the PowerEdge R530, R530xd, R630, R730, R730xd, T430 and T630 among the compatible systems. This gives a confirmed set of server families for which the part is specified; compatibility depends on the particular system configuration.