The Schneider Electric A9KR13240 is a 2-pole residual current circuit breaker (RCCB) from the Acti9 ID K series, rated at 40 A with 30 mA earth-leakage sensitivity. The 30 mA sensitivity (Type AC) covers sinusoidal AC residual currents, which is the standard protection level for general-purpose socket-outlet circuits and final subcircuits in residential and commercial panels. The instantaneous trip time means no intentional delay — it clears a ground fault as soon as the leakage exceeds threshold.
Clip-on mounting to DIN rail (35 mm symmetrical rail per EN 60715). Neutral is on the left. Biconnect terminals top and bottom accept 1-35 mm² rigid or 1-25 mm² flexible cable; strip length 14 mm, tighten to 3.5 N·m. IP20 on the front face (finger-safe), IP40 within the modular enclosure once installed. Pollution degree 2 — suitable for normal indoor environments where only non-conductive pollution occurs.
The operational voltage (Ue) is 220-240 V AC — this is the coil/line-to-neutral voltage it expects. Electrical durability is 4000 cycles under AC-1 resistive load; mechanical durability is 5000 cycles. For a fixed RCCB in a distribution board that sees infrequent manual operation, this is adequate — it's not a switching device cycled daily. The 8/20 µs impulse withstand of 200 A means it survives common lightning-induced surge currents without nuisance tripping.
Compliance documentation includes EN/IEC 61008-1 (the RCCB product standard) and SS 97:part 1 (Singapore standard). Carries SAFETY Mark quality label. No UL or CSA listing — this part is designed for IEC markets primarily.