It's called a floating breaker....

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ggunn

PE (Electrical), NABCEP certified
Location
Austin, TX, USA
Occupation
Electrical Engineer - Photovoltaic Systems
So what will you do about the “floating breaker”?

At 800A nominal a heavy fault current is going to cause magnetic repulsion between conductors. It can and has caused substantial damage.
Is the OP on the hook for bringing it up to code if he is the one who opened the enclosure and found it?
 
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