Fujitsu PRIMERGY BX600 S3 Service Supplement Manual page 21

Important notes
Single basic unit with a single UPS
Figure 5: Single basic unit with a single UPS
A fully equipped BX600 S3 basic unit populated with four power supply units
requires approximately 5120 Watts (power factor 0.96). Therefore you need a
UPS with sufficient output to power a BX600 S3 basic unit.
I
Alternatively, you can connect the redundant power supply units (PSU3
and PSU4) directly to the mains.
UPS
Service Supplement
Notes on power cabling
Single-phase
or
3-phase input
21