The Schneider Electric A9R51225 is an Acti9 iID residual current circuit breaker (RCCB) — 2 poles, rated 25 A continuous, with 30 mA earth-leakage sensitivity and Type A protection.
The 1500 A breaking capacity (Idm/Im) is the fault-clearing limit; downstream fault current must not exceed that figure at the rated voltage. The 25 A rating matches the load current of a branch circuit feeding multiple socket outlets or a dedicated appliance up to that draw.
Clip-on DIN rail mounting — 4 modules wide (9 mm pitches each). Terminals accept 1–35 mm² rigid or 1–25 mm² flexible, stripped 14 mm. Tightening torque 3.5 N.m. IP20 on the body, IP40 inside a modular enclosure. Neutral is on the left; padlock provision for lockout/tagout. The instantaneous trip (no time delay) means it sits on outgoing circuits, not upstream selective coordination.
