Review on ANJOSHI 50A 300A Inverter: Unmatched Waterproof Protection for Ultimate Performance by Dawson Schmidt

This is a high quality thermal circuit breaker. DROK's cheap ones are a waste of time if you plan to run a consistently high current through the line. It tripped once when the load was below the specified current, so I'm not sure the rating is entirely accurate, but generally it works fine unless the load is expected to be within 20% of the maximum rating lie.