Fuse size when using 2 pairs of cable to connect a multiplus

I have a multiplus 12/3000 connected to a lynx distributor.

The documentation calls for 2x 50mm cables fused at 400A, but it’s very unclear wether each cable should be fused at 400A, or wether it should be 200A each, 400A being the total

Thank you !

400A total
The inverter will draw about 300A when on full chat.

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@brann
It is 400A total.
200A on each cable. 50mm² can carry the current to blow that size fuse.

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