What size fuse do I need for the PRD1050?

I own a PRD1050 and I want to buy a fuse. If I am correct in my understanding then possible demand is 600W. It runs on 230V.

Watts = Amps * Volts

so..

Watts / Volts = Amps

so...

600 / 230 = 2.61 Amps required for the fuse

No such thing as a 2.61 amp fuse so I need a 3 amp fuse. Is this correct?
Update: Link to UPS specs

http://www.advice.co.il/images/files/UPS/specifications_partner_digital_EN.pdf
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