DC Parallel Breakers
No, you shouldn't do this. The problem is that the breakers won't share current equally because they're not totally identical and their contact resistance might vary[1]. This means that one of them will trip much faster than the others, causing their total current-carrying capability to be much lower than expected.
Additionally, the four breakers won't open at the exact same time, which means that one of them will momentarily carry all of the short-circuit current and therefore exceed its rating.
[1] The contact resistance is somewhat random every time the breaker is operated (due to arcing and contaminants being &quot;smeared&quot; across the contact surface when operating) and it will also change with temperature, vibrations, oxidation or just on its own. Here's a bulletin by Schneider Electric about the topic: https://download.schneider-electric.com/files?p_enDocType=Data+Bulletin&amp;p_File_Name=0600DB1901.pdf&amp;p_Doc_Ref=0600DB1901