Overload protection Ir is settable from 18 A to 25 A; short-circuit protection Ii is fixed at 12.8 × In.
Breaking capacity and protection settings
The 25 A frame with adjustable Ir (18–25 A) lets you fine-tune the overload pickup to match the protected conductor or load, avoiding nuisance tripping on inrush while still clearing sustained overloads. The fixed magnetic trip at 12.8 × In (320 A) is set for motor-start or high-inrush applications; it clears hard shorts fast without needing a separate instantaneous adjustment.