Can I use a 250 VAC socket for 120V power?
That connector is rated to handle up to 250 Volts at 10 Amp.

It is the same type of connector that is used on desktop computers and many other things these days.  It is certainly appropriate to use it for 120 VAC, as we have in Canada.

The fuses should be rated to suit your application, but not more than 10 Amp.