Ignoramus29233 wrote:

Regarding a danger of backfeeding a generator, I have a question.

What if the generator has a circuit breaker? So the backfeeding power
goes in through a breaker? Would the breaker save the generator from
backfeeding damage, in this instance? (assuming properly sized
breaker)


Yes , no and perhaps.

A breaker can not (by itself) sense that the power flow is reverse. So
if the reverse flow isn't large, then NO.

If the flow is large, so that the current exceeds breaker rating, then
perhaps.
If the flow is large, then yes.
If even larger, then again perhaps not.

TYpical rule of thumb in protection for piston (Turbines are a
different animal) engines (large) against reverse power, is 15%-25% of
rating, for a time period from seconds to minutes. But that requires a
reverse power relay.

Still won't protect you against twisting or snapping your shaft.

jk