The D-curve (10–20× In) means it tolerates the inrush of motor starters, transformers, or discharge lamps without nuisance tripping, so it belongs in a machine control panel or a distribution board feeding inductive loads, not a general-purpose lighting final circuit.
In a panel with a transformer upstream that can deliver 25 kA of fault current, this holds; if your service entrance can push 50 kA, you step up to a higher-rated frame. The 15 kA DC rating at 72 V DC covers battery-backed control circuits or DC bus distribution — useful in UPS-fed panels. D-curve (10–20× In) means magnetic trip happens between 250 A and 500 A for this 25 A unit. That's wide enough to pass the starting surge of a 7.5 kW DOL motor without blinking, but still clears a bolted fault fast. At one width unit (18 mm), it occupies a single module slot.