I need to run 6-3 w/ground 60 feet for a hot tub. I have a Cutler-Hammer main panel box> What breaker do I need for this?

First tell us about the hot tub. What is the rating, how many amps? 6/3 NM-B or UF-B? How do you plan to run it?

Should be a Nameplate showing Watts/Amps, and/or recommended size of Breaker.