The Schneider Electric A9R71240S is a 2-pole residual current circuit breaker (RCCB) from the Acti9 iID family, rated 40 A continuous and 30 mA earth-leakage sensitivity. The 30 mA trip threshold covers personnel protection (hand-to-ground fault paths) per IEC 60364. Voltage-independent tripping means the RCCB clears a ground fault even if the phase voltage collapses, which matters on circuits where the neutral might lift. The 1500 A making/breaking capacity (Idm/Im) handles the inrush from downstream MCBs without welding contacts.
Neutral on the left, line on the right — standard for Acti9 outgoing feeders. Terminals accept 1 to 35 mm² rigid or 1 to 25 mm² flexible (with or without ferrule); strip length 14 mm. Torque to 3.5 N·m. IP20 body, IP40 inside a modular enclosure. Padlocking option for lockout/tagout.
