Cisco PWR-C3-750WAC-R/2 | 750W Redundant AC Power Supply, Front-to-Back Airflow

Q: What is the difference between PWR-C3-750WAC-R and PWR-C3-750WAC-R/2?
A: The PWR-C3-750WAC-R/2 is the redundant (secondary) power supply variant intended for the second PSU bay in dual power supply configurations. Both provide 750W output with front-to-back airflow, but the /2 designation indicates it's ordered as a redundant backup unit for high-availability deployments.

Q: Which Catalyst switches are compatible with this power supply?
A: This power supply is compatible with Cisco Catalyst 3850 series switches (including 48XS models) and Catalyst 3650 series switches. It's specifically designed for models that support dual redundant power supply configurations with Config 3 airflow requirements.

Q: Can I mix different power supply models in redundant configuration?
A: For optimal redundancy and performance, it's recommended to use matching power supplies with the same wattage and airflow direction (front-to-back). Mixing different Config types or airflow patterns may result in cooling inefficiencies or incompatibility.

Q: What does front-to-back airflow mean for deployment?
A: Front-to-back airflow means the power supply draws cool air from the front of the switch and exhausts hot air toward the back. This airflow pattern is critical for proper rack cooling design, ensuring the PSU works efficiently with your data center's hot aisle/cold aisle configuration.

Q: Is this power supply hot-swappable?
A: Yes, the PWR-C3-750WAC-R/2 is hot-swappable, allowing you to replace or install the redundant power supply without powering down the switch, provided the primary power supply is operational. Always install the primary PSU in bay 1 before adding the redundant unit to bay 2.