The thermal-magnetic trip unit is fixed: Ir = 63 A overload protection, and short-circuit pickup Ii is set at 10 x In (630 A). That means it's a line-protection breaker — not adjustable, not for motor-starting duty where you need a higher magnetic pickup to avoid nuisance trips on inrush. It's sized for a feeder or a large branch circuit where the load is predictable.
The description also notes a nut keeper kit for DC Power OEM in China — a mounting accessory for DC-side applications.