The Cisco PWR-C2-640WAC is a 640-watt spare AC power supply designed for Cisco Catalyst 2960XR and 3650 Series switches. Engineered for high-efficiency and reliability, it supports auto-ranging input (100–240 VAC, 50–60 Hz), ensuring seamless global deployment. The unit delivers consistent power for full PoE+ switch operation and includes internal cooling fans for effective thermal management. Compact and lightweight, the PWR-C2-640WAC is field-replaceable (FRU) and ideal for ensuring network redundancy and uptime. It provides both +12V and -54V outputs with thermal ratings up to 2371 BTU/hr, meeting the demands of enterprise environments. This power supply is essential for scalable network installations requiring high-availability and efficient energy use, supporting both primary and.