Mystery breaker inside switch panel

Anyone that has wondered what the mystery breaker inside the switch panel is for. ...

It is simply a breaker for the AC (line voltage) to the inverter from the switch panel
(See yellow arrow below in the schematics for Horizon).

Please be aware that this switch seems to be wired differently on different Outbounds. Ours is on the AC-IN to the inverter. But some hulls have it on the AC-OUT from the inverter.

Regardless, we have our switch on all the time. We still have to figure out why we would ever like to turn it off.

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