650W AC Config 4 Power Supply front to back cooling

C9K-PWR-650WAC-R/2 Cisco Catalyst 9500 650W AC Power Supply
The Cisco Catalyst 9500 Series Switches support dual 1+1 redundant power supplies. The switches ship with one power supply by default. The second power supply can be purchased at the time the switch is ordered or at a later time. If only one power supply is installed, it should always be in power supply bay #1.

C9K-PWR-650WAC-R/2 Technical Specifications

General
Product Type : Power supply – redundant
Subcategory : AC Power supply

Header
Brand : Cisco
Manufacturer : CISCO DS HARDWARE DIRECT
Redundant Power Supply
Packaged Quantity : 1
Product Line : Cisco Catalyst

Power Device
Power Provided : 650 Watt 650WAC
Power Supply Compatibility : Network hardware C9500