Arista PWR-500-DC-F 500W DC Power Supply — Forward Airflow, Hot-Swappable PSU for Arista Switches

DC power for Arista switches in telecom and -48V data center environments.

The Arista PWR-500-DC-F is a 500W DC power supply module for Arista switches installed in DC-powered facilities. It accepts -40V to -72V DC input, uses forward (front-to-rear) airflow and is hot-swappable. It suits carrier, telecom and data center operators running -48V DC power plants.

Powering Switches in -48V DC Facilities

Telecom central offices and many carrier data centers distribute -48V DC instead of AC. AC-only power supplies cannot run in these sites without inverters, which add cost, heat and points of failure.

The PWR-500-DC-F connects directly to the DC plant, accepting -40V to -72V DC. That removes the need for conversion equipment and lets Arista switches run on the same battery-backed DC power as the rest of the facility.

Forward Airflow for Standard Cold-Aisle Layouts

The -F suffix means forward airflow: cool air enters at the port side and exits at the power supply side. Match it to switches with forward-airflow fans to keep the cooling pattern consistent.

Hot-Swap Redundancy

With two PSUs installed, the switch continues to run if one fails. The PWR-500-DC-F slides into the bay and locks in place, restoring redundancy without a maintenance outage.

Setup Instructions

How to Install the Arista PWR-500-DC-F

1. Confirm your Arista switch supports PWR-500-DC-F and uses forward-airflow fans, then switch off the DC breaker feeding the replacement bay.
2. Remove the failed module by releasing the latch, and slide the PWR-500-DC-F into the bay until it locks.
3. Connect the -48V DC feed and return leads, plus the ground, to the DC terminals with the correct polarity and torque.
4. Switch on the DC breaker, check the PSU LED and confirm the supply status with “show environment power” in EOS.