Additional Fused Cutoff For Spa

I am having a spa wired this weekend and would like some advice. I have a GFI (50 amp double pole) cutoff that is going to go 5 feet from the spa and then a 50 amp regular breaker to go in the main service. #6 will connect all the wires in beteween.
My electrician suggested that I could also add a fused a/c style cutoff in line to add protection. Is this a waste of money or will it provide a layer of protection that the GFI will not? He mentioned that fuses cut off in any unwanted circumstance....I guess referring to an arc or short or something where the GFI would not fail (other than ground fault). Also what about an AFCI breaker in the main service? WIll this play nicely with a GFI cutoff downstream, or will it constantly trip? Just wanted to know if this was necessary or overkill.
Anyone done anything similar? This is above and beyond code, it appears.
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anybody???
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I think this is overkill, especially the AFCI.
You have overcurrent protection at the panel, and you have GFI protection at the spa. The only other thing you should have is a disconnect switch within visible range of the spa for servicing. If the GFI has a switch, then you should be covered. I wouldn't add a fused disconnect or an AFCI breaker.
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thanks for the input bob
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