Cisco Systems Cat 4500 6000W AC Dual Inpu FD

The 6000W ACV and 4200W ACV power supplies feature combined Mode Power Resiliency as an extension of the traditional combined mode power-supply behavior. Each power supply contains two smaller power supplies (called subunits). In Combined Mode Power Resiliency the system relies only on power from three out of four power-supply subunits. When using 200 VAC, this feature helps ensure that maximum power is available while the switch is protected against a single input power failure or subunit component failure.