120 VAC switch safety feature?
If you are worried about shocks, then you need a GFCI protecting the circuit.
A fuse is no guarantee of protection as 30mA can kill a human, and you won't get a fuse to blow at that current.

But the main thing is to design the enclosure properly, and use appropriately rated switches for the voltage.  If the switches aren't fully insulated, then ground the metal bits.