Replacing a Summit 450 W or 550 W
DC Power Supply
Summit 550 W power supply units (PSUs) are
available with either front-to-back or back-to-front airflow. If you install two PSUs,
both must have the same airflow direction.
![Note](images/note.png)
Note
You cannot combine power supplies of
different wattages in the same switch.
You need the following tools and materials to replace a
450 W or 550 W DC power supply:
- #1 Phillips screwdriver
- Torque screwdriver and wrench or torque driver with
attachments for tightening screws and nuts
- Thermal protective gloves (required for removal of a power
supply)