Arista PWR-621-AC-RED | 650W AC Power Supply, Front-to-Rear Airflow

Q: Which Arista switch models are compatible with the PWR-621-AC-RED?
A: The PWR-621-AC-RED is compatible with Arista 720XP and 722XPM series 1RU campus switches that require front-to-rear airflow configuration. This includes models such as CCS-720XP-24Y6, CCS-720XP-48Y6, CCS-722XPM-48Y4, and CCS-722XPM-48ZY8.

Q: What is the difference between PWR-621-AC-RED and PWR-621-AC-BLUE?
A: The PWR-621-AC-RED features front-to-rear airflow, while the PWR-621-AC-BLUE features rear-to-front airflow. Both provide 650W of power output. The airflow direction must match your switch chassis and data centre hot aisle/cold aisle configuration for optimal thermal management.

Q: Can I mix the PWR-621-AC-RED with the PWR-1021-AC-RED in the same switch?
A: Yes, Arista 720XP and 722XPM switches support mixing different power supply models for redundancy. However, it is recommended to use matching power supplies for optimal performance and balanced power distribution in N+1 redundant configurations.

Q: How much PoE power is available with a single PWR-621-AC-RED?
A: Available PoE power depends on the switch model and its base system power draw. For example, on a CCS-722XPM-48Y4 switch, a single PWR-621-AC-RED provides approximately 567W PoE power budget after accounting for system overhead.

Q: Is the PWR-621-AC-RED hot-swappable?
A: Yes, the PWR-621-AC-RED is designed as a hot-swappable, field-replaceable power supply module. You can install or remove it without shutting down the switch, provided at least one other power supply remains operational in redundant configurations.