What is the amps or watts rating of the 120 volt side of the Plugable PS2-USB3?

Thanks for asking!

The rating is the same as the circuit in your wall, this just directly passes through on the AC side, it’s directly wired from the input cable to the two outlets.

Also, this was not designed to be used outside of the United States. While you could adapt it to work in another country, we can’t guarantee that any devices designed for US use only wouldn’t be damaged if connected to the AC outlets.