The A9D61640 is a Schneider Electric Acti9 iDPN Vigi residual-current circuit breaker with overcurrent protection (RCBO) — one module wide, 1P+N, rated 40 A with a C-curve magnetic trip characteristic and integrated 30 mA earth-leakage protection. It's the go-to for final subcircuits in distribution boards where you need both overcurrent and earth-fault protection in a single DIN-rail module.
40 A rated current (In) and C-curve (5–10× In magnetic trip) mean this RCBO handles general-purpose resistive and moderate-inductive loads — lighting banks, small appliance circuits, socket outlets — without nuisance tripping on inrush. Thermal-magnetic trip technology means the bimetal handles sustained overloads while the solenoid clears short-circuits — no electronic trip curve to fail or drift over time. The limitation class 3 rating means it limits let-through energy well, reducing stress on downstream wiring and loads during a fault.
Terminals accept 1–16 mm² rigid or 1–10 mm² flexible, with a 2 N·m tightening torque and 15 mm strip length. IP20 on the body, IP40 inside a modular enclosure — fine for dry indoor panels; not rated for washdown. The toggle gives local ON/OFF/trip indication, so you can spot a tripped circuit at a glance without metering.