I'm planning to get rid of the voltage selector switch and just hard wire it to 120v all together. Now there's a fuse that's connected with the switch. Can I just by pass that fuse?

Ac line is:

Brown
Blue
Green

The brown goes into the fuse another wire jumps out of the fuse and goes into the voltage selection circuitboard.

And the blue from the ac goes into the voltage selection circuitboard.

Is that fuse really nesaccry?

A fuse is there for a reason. Remove at your own risk, and others if this is used in public venues. Could be criminal if fatalities are involved. Not electrical that time but remember Rhode Island?

Agreed, leave the fuse in, and make connections for 120 vots. Could add a little circuit breaker, if minimum downtime is desired after blowing.
It is probably easier to change a fuse, than change the wiring, Plus safer as mentioned.
All fuses and breakers are necessary. They protect the wire,

Agreed leave the fuse. Where are you located and what piece of equipment are you discussing? Is there another on/off switch in this circuit?

They protect the wire which can burn uncontrollably, emit noxious vapors and ultimately protect the house from burning down. They can also make repairs less extensive. Remember that line fuses haveto be changed based on the mains voltage.

Thanks guys,

So I should connect brown from one end of the fuse terminal and blue to the other end?

I think you will have a dead short if you connect the blue and brown to a fuse. The blue and brown are the two input feeds.

Keep in mind, that since this is a European unit, it has IEC color codes, not USA color codes.

I would say simply remove the voltage selector switch,(I think this answers the purpose of the two black and the blue and brown), and connect those wires after removing the switch, leaving the fuse in line.

Be sure to deliver the proper voltage to the unit's components.

Probably don't need to remove switch physically if keeping for yourself. If it was sold and resold, someone needing a different voltage, may unintentionally destroy due to their not knowing switch is inoperative, if using on a different voltage If removal difficult, maybe scratch off voltage so it won't be misused.