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I'm not the biggest fan. If stuff is tripping out, its doing it for a reason. Even at work we generally dont auto reset anything. There is always the possibility of it frequently trying to close in...

Some responces in red
I will add that protecting the cable is first and foremost.

Attached is a random trip curve graph plucked from the internet. The darker section is the area where the...

Not in circles yet. I'm probably not explaining my point regarding fault current and instantaneous trips properly.

No, the message is get the breaker to trip instantly in the event of a fault, dont give it a chance to wait around and trip whenever, hoping it doesn't damage other stuff. That just increases the...

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Those circuit breakers ( guessing based on another brand of Automotive C/B's ) probably have an instantaneous trip (<0.4sec) of 10×Rated current.
That is 10x120A=1200A. If your circuit is...

Not overkill if there is a 120A breaker there. You need to select circuit protection according to cable size, so it protects the cable to prevent it burning up in the event of a fault.
I would only...

That cable is way too small for a 120A C/B. If it is 4awg (which is just under 25mm2) it will be really pushing to be good for 80A at it's very best. That cable could go in smoke before that bresker...

Just 1 question. How big is the cable through that breaker?

They are a solid state relay, they have no moving parts to fail, no contacts to pit or burn out. The down side to SSR's is they don't 'play up' as such. They work and then they don't.

The diagram I posted is correct.

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Why is there a temporary wire hanging off the earth.
This is how it should be wired. The pic you posted earlier with the power in and power out description on the coils is incorrect. Probably more...

How have you wired your switch?