The Lenovo 00HM630 is a 45 W AC adapter for powering notebooks. Its model number and 3-pin WW configuration identify this specific variant.
It has a 3-pin AC input and a square yellow-tip output connector. The listed DC output is 20 V at 2.25 A, specifying the power connection this model provides.
Described for Lenovo and IBM notebooks, it can serve as a replacement adapter when the computer’s required input matches the listed connector and output specifications.