Lenovo 550W PSU 94Y8173-RFB is a refurbished power supply for replacing a matching unit in a supported system. The listing identifies it as a Lenovo part and gives 550 W rated power, making its capacity clear for service or repair work.
The exact listing reference is 94Y8173-RFB; the same listing gives 94Y8173 as its OEM reference. It is supplied as a refurbished unit. Connector details and package contents are not specified in the listing.