Hitachi NAS Platform 4000 Series Hardware Reference Manual page 78

Replacing a power supply unit
Caution: You cannot use the power supply from an HNAS 4060, 4080,
and 4100 server in an HNAS 4040. The HNAS 4040 server uses the same
PSU as the HNAS 3080 and 3090 servers.
Note: Although the following figure shows the HNAS 4060, 4080, and
4100 rear panel, the PSU locations are the same on the HNAS 4040
model.
Figure 35 PSU locations on NAS Platform Series 4000 rear panel
Chapter 5: Replacing server components
Hitachi NAS Platform and Hitachi Unified Storage Series 4000 Hardware Reference 78