Arista PWR-460AC-R 460W AC Power Supply — Hot-Swappable, Reverse Airflow PSU for Arista Switches

Restore power redundancy on Arista switches with a matched 460W hot-swap supply.

The Arista PWR-460AC-R is a 460W AC power supply module for Arista data center switches, including models in the 7050 and 7150 series that list this part. It is hot-swappable, accepts 100–240V AC input and uses reverse (-R) airflow. It suits network engineers maintaining redundant power in data center and enterprise racks.

Why the Airflow Code on an Arista PSU Matters

Arista switch power supplies come in forward (-F) and reverse (-R) airflow versions. Installing the wrong direction makes the PSU fan push air against the switch fans, which raises internal temperatures and can trigger alarms or shutdowns.

The PWR-460AC-R is the reverse-airflow version. It moves air in the same direction as switches configured for rear-to-front cooling, so the system keeps its designed hot-aisle/cold-aisle pattern.

Redundancy Without Downtime

Arista switches typically run two power supplies in a 1+1 configuration. When one fails, the switch keeps running on the other; the PWR-460AC-R can then be hot-swapped into the empty bay to restore redundancy without interrupting traffic.

Data Center Power Compatibility

Universal 100–240V AC input supports both North American and international power, and the module connects through a standard IEC power cord. Its 460W rating covers the full load of the switch models it is listed for.

Setup Instructions

How to Replace an Arista PWR-460AC-R Power Supply

1. Confirm the part number is listed as supported for your Arista switch, and confirm the existing fans and PSUs use reverse (-R) airflow.
2. If the device has a second working power supply, leave it running; otherwise schedule a maintenance window and power the device down.
3. Disconnect the AC or DC cord from the failed unit, release the latch and slide it out, then slide the new module into the empty bay until it locks.
4. Connect the power cord, check that the PSU status LED turns green, and confirm in the device CLI or management interface that the supply reports OK.