Your search for "pwr-500-dc-r" revealed the following:

Arista DCS-7020SR-24C2-F 24x 10GB SFP+ 2x 100GB QSFP F-B Air Switch

SKU: NSH-8203
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7020TR-48-R 48x 1GB RJ45 6x 10GB SFP+ B-F Airflow Switch

SKU: NSN-3607
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050TX-72-F 48x 10GB Copper 6x 40GB (2xMXP) F-B Airflow Switch

SKU: NSN-6525
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7050TX-72-F 48x 10GB Copper 6x 40GB (2xMXP) F-B Airflow Switch

SKU: NSH-7464
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7020SR-24C2-F 24x 10GB SFP+ 2x 100GB QSFP F-B Airflow Switch

SKU: NSN-4911
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7160-48YC6-F 48x 25GB SFP+ 6x 100GB QSFP Front-to-Back Air Switch

SKU: NSN-2382
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7020SR-24C2-R 24x 10GB SFP+ 2x 100GB QSFP B-F Air Switch

SKU: NSH-8204
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7020TRA-48-F 7020R Series 48x GE RJ45 6x 10G SFP+ F-B Air Switch

SKU: NSN-4116
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050TX-72Q-R 48x 10GB Copper 6x 40GB QSFP+ B-F Airflow Switch

SKU: NSN-4224
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7160-48YC6-R 48x 25GB SFP+ 6x 100GB QSFP Back-to-Front Air Switch

SKU: NSN-1845
Condition: New
Shipping: Overnight Options
Warranty: 365 days