For a 10 A breaker on a lighting or heater circuit, that's the curve that avoids nuisance trips while still clearing a hard short. Interrupting capacity is 6 kA at 277 VAC and 10 kA at 250 VDC. That 6 kA AC figure is standard for downstream distribution in a panel fed by a larger upstream device; the 10 kA DC rating covers battery-backed control circuits and DC bus taps common in conveyor zone controllers.
Integration Notes
The 1-pole width (roughly 18 mm per module) keeps the footprint tight for multi-circuit subpanels feeding conveyor zone controllers or lighting contactor coils.