Why is this switched power inlet fused on both load and neutral sides?
This device is rated for 250V. Assuming that you are in the USA/Canada, your 240V is actually two 120V lines, 180 degrees out of phase.

If your application is 120V hot/neutral/ground, you can simply wire in only one fuse holder, on the hot

Sorry, I misread the datasheet. I see now that the 6090 variant has the fuse holders already wired in.