Install Guide

Power supplies
The S4048T-ON ships with two power supply units.
The system supports AC or DC power supplies with two air-ow directions—from the I/O side to the PSU side and from the PSU side to
the I/O side. Two PSUs are required for full redundancy, but the system can operate with a single PSU.
The PSUs are eld replaceable. When running with full redundancy—two power supply units installed and running, you can remove and
replace one PSU without disrupting trac.
NOTE: If you use a single PSU, install a blank plate in the other PSU slot. Dell EMC recommends using PSU2 as the blank plate
slot.
NOTE: Connect the power supply to the appropriate branch circuit protection as dened by your local electrical codes. Verify
that the remote power source complies with the switch input power specications.
NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap when
handling the S4048T-ON and its components.
CAUTION: To prevent electrical shock, verify that the S4048T-ON is grounded properly. If you do not ground your equipment
correctly, excessive emissions may result. Use a qualied electrician to ensure that the power cables meet your local electrical
requirements.
Topics:
• Components
• AC power supply installation
• DC power supply connection
Components
The following power supply options are available for the S4048T-ON:
• AC or DC power supply with integrated fan
• AC or DC power supply with integrated reverse ow fan
PSU1 is on the left side of the chassis; PSU2 is on the right side of the chassis.
Figure 16. S4048T-ON PSU-side view
1
PSU1 2 Fan modules
6
30 Power supplies