Your search for "N55-PDC" revealed the following:

Cisco N55-PDC-1100W 1100W DC Back-to-Front Airflow (PSE) Power Supply

SKU: NSH-2660
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N55-PDC-1100W 1100W DC Back-to-Front Airflow (PSE) Power Supply

SKU: NSN-5431
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N55-PDC-750W 750W AC Back-to-Front Airflow (PSE) Power Supply

SKU: NSN-5348
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N55-PDC-1100W-B 1100W DC Front-to-Back Airflow (PSI) Power Supply

SKU: NSN-5632
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco N55-PDC-750W 750W AC Back-to-Front Air (Port Side Exhaust) Power Supply

SKU: NSH-7702
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days