EATON HEINEMANN 250 amp GJ series breaker. A Canadian company. Very old school and very industrial quality. Maybe one each per inverter to bussbar and a seperate similar breaker for the Coach 12 volt system. The only thing lacking is the "cheap" part.Schneider Electric RNW8651065 - Inverter Supply
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Given the price of the Class T fuses, the price of that breaker isn't that bad. I found them for as low as $83.
A quick search didn't turn up a datasheet. I would like to see the specs for that breaker. It looks similar to one I saw on the Midnite Solar site.