Arista PWR-621-AC-BLUE | 650W AC Power Supply, Rear-to-Front Airflow, Hot-Swap

Q: Which Arista switches are compatible with the PWR-621-AC-BLUE?
A: This power supply is compatible with Arista 720XP and 722XPM series 1RU campus switches that require rear-to-front airflow cooling. The blue handle indicates the airflow direction and ensures proper thermal management when installed.

Q: What does the BLUE designation mean?
A: The BLUE suffix indicates rear-to-front airflow direction. Arista uses color-coded handles to identify airflow: blue handles are air inlet modules with rear-to-front airflow, while red handles indicate front-to-rear airflow. This allows for proper hot aisle/cold aisle rack configuration.

Q: Can I mix this power supply with other models in redundant configuration?
A: For redundant power configurations, Arista recommends using identical power supply models with matching airflow direction. Mixing different wattage or airflow models may result in operational issues or reduced redundancy capability.

Q: What is the available PoE budget with this power supply?
A: The available PoE budget varies by switch model. For example, 720XP switches with a single 650W PSU can deliver between 490W to 567W for PoE depending on the specific model and system power consumption. Dual PSU configurations increase the available PoE budget significantly.

Q: Is this power supply hot-swappable?
A: Yes, the PWR-621-AC-BLUE is a hot-swappable redundant power supply module. It can be replaced without powering down the switch when a second power supply is installed and operational, ensuring uninterrupted network operation.