I use a class T-fuse at the battery, the primary criterion was ability to safely and effectively interrupt a potentially massive short circuit from the LiFePo bank. There's a notional rating for fuse capacity (trip current) which you've referenced, but there's another rating which is the absolutely maximum that the fuse can safely and effectively interrupt. This rating is tied to the physical design and construction of the fuse/CB.
If a short circuit exceeds this interrupting capacity, the current could arc over the device and/or other catastrophic failure modes. Please note that the interrupting capacity drastically changes on whether the current is AC or DC, so check that on the datasheet. AC can self extinguish on polarity reversal, this can't happen with DC.
This is largely an issue for Lithium chemistries, I don't believe that (most?) LA batteries are physically capable of generating the very intense short circuit currents which is necessary to overcome the interrupting capacity.
Kai
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