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There is an interesting paper on fuses in parallel.
http://doc.aemcomponents.com/appnotes/AN_fuses_in_parallel.pdf

What is your max continuous operating current?
400A?

As I read and interpret the paper
Accounting for operating and temp deratings (Their paper assumed 85C)
I think you could use 2 600V/500A fuses in parallel for 400A operating current instead of a single 630A single fuse with the same deratings.
 
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