The C-curve (5–10 x In) means the magnetic trip holds through motor inrush and capacitive loads that would nuisance-trip a B-curve; expect it to pass a 10 A lighting or small-appliance circuit without false trips. Integrated earth-leakage protection at 300 mA sensitivity (Type AC, per the device class) covers cable insulation faults and gradual leakage. This is not a 30 mA personal-protection device — it is sized for equipment protection and fire prevention on circuits where a lower threshold would cause nuisance tripping from natural leakage. Limitation class 3 (EN/IEC 61009-2-1) means the device limits let-through energy under fault conditions, reducing stress on downstream wiring and connected equipment.
Clip-on mounting to DIN rail (35 mm per EN 60715) with a 9 mm pitch between phase and neutral terminals. Neutral is on the left, phase on the right — wire accordingly. Tunnel terminals accept 1–16 mm² rigid or 1–10 mm² flexible; strip 14 mm and torque to 2 N·m. The white colour is standard for the Acti9 range. Local ON/OFF and fault indication (mechanical flag) helps a field tech identify a tripped RCBO without metering.