The TM220 thermal-magnetic trip unit provides overload protection adjustable from 56 A to 80 A (Ir) and fixed short-circuit protection at 10 x In (Ii = 800 A). That 10x multiplier is typical for line protection on motor feeders or distribution sub-mains where you need to ride through starting inrush without nuisance tripping.
The 4-pole construction includes an unprotected N conductor terminal — the neutral is switched but not internally protected, so it handles the same continuous current as the phases but relies on upstream or downstream protection for fault clearance. Terminal connections accept copper or aluminum conductors; verify lug torque per the nameplate.