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It protects the main feed, and nothing else. A 200A breaker sits between the battery and the busbar on 0 B&S cable with 50mm lugs; everything branching off that busbar needs its own smaller protection. Treat it as the trunk breaker and build the branch fusing behind it.
0 B&S minimum, with 50mm lugs drilled 10mm to suit the 3/8-16 studs. That cable is stiff and heavy, so plan the route first and support it near the breaker. Undersized cable behind a 200A breaker is the most common mistake in a big build.
That is the case it is built for. IP67 sealing and ignition protection to SAE J1171 mean it is rated for a closed battery box or an engine bay, and it is certified to ABYC E-11 for marine wiring. Keep the feed short and the terminations tight.

AllSpark

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