Cisco PWR300-AC-RPS-N1

Cisco PWR300-AC-RPS-N1, CNP3DG0BAA Redundant Power System 300 (RPS 300)
Features a less than 60µs (microsecond) failover capability. Preventing a switch reboot following an internal switch power failure.
Supports both traditional Ethernet switches running at 12V and new, inline powered Ethernet switches running at -48V.
In combination with a UPS, the RPS 300 delivers a maximal network uptimeby providing backup for the primary internal power supply as well as a battery backup.

Supports:
Catalyst 4224 Access Gateway Switch
Catalyst 3550 Series Switches (Catalyst 3550-24 PWR is only compatible with the Cisco RPS 675)
Catalyst 3524-PWR XL Switch
Catalyst 2980G-A Switch
Catalyst 2950 Series Switches
Catalyst 2900 LRE XL Switches