Juniper MX960 Hardware Manual page 651

NOTE: During the upgrade process, you can simultaneously run normal-capacity and high-capacity
power supplies. However, it is recommended to upgrade all power supplies to high-capacity
power supplies.
To install an MX960 high-capacity AC power supply, use the following procedure (see
Figure 114 on page 338).
1. Verify that the power switch on the power supply is in the off (O) position.
2. Ensure that the release lever below the empty power supply slot is locked in the counterclockwise
position (see Figure 114 on page
Figure 239: MX960 with High-Capacity AC Power Supplies Installed
Air exhaust
AC Power
supplies
Power supply
ejectors
Protective earthing
338).
Input mode switch
ESD point
641