The Schneider Electric A9R50225S is a 2-pole residual current circuit breaker (RCCB) from the Acti9 iID K series, rated 25 A with 30 mA earth-leakage sensitivity.
The 25 A rated current (In) sets the continuous load capacity — sized for branch circuits feeding lighting, socket outlets, or small equipment. The 30 mA sensitivity is the standard threshold for personal protection against lethal shock; Type AC detection means it trips on sinusoidal residual AC currents only, not pulsed or DC components, so it suits general-purpose circuits without electronic loads that generate smooth DC fault currents. Breaking capacity is rated Idm 500 A / Im 500 A, which covers most domestic and light commercial fault conditions. The instantaneous trip time (no intentional delay) ensures fast disconnection on earth faults. Voltage-independent residual current tripping means the RCCB detects leakage even if the line voltage drops — a reliability advantage for circuits with long cable runs or poor supply. IP20 (finger-safe) for the terminals; IP40 when housed in a modular enclosure. Ambient operating range is -5 to 60 °C; storage range -40 to 85 °C.
Designed and certified to EN/IEC 61008-1 (RCCB standard). Carries VDE quality label. Pollution degree 2 (normal, non-conductive pollution).