The Schneider Electric A9R81440 is a 4-pole residual current circuit breaker (RCCB) from the Acti9 iID family, rated at 40 A with a 30 mA earth-leakage sensitivity. The 30 mA sensitivity is the standard for shock protection in residential and commercial distribution boards (per IEC 60364). Because it's Type AC, it responds to sinusoidal AC residual currents only — that covers basic circuits like lighting and general-purpose sockets, but not electronics-heavy loads that generate pulsed or DC fault currents (those need Type A or F).
Rated breaking and making capacity is 1500 A (Idm and Im both at that value). That's the maximum fault current this RCCB can safely interrupt — it's sized for the downstream fault level in a typical final distribution circuit, not for high-fault-capacity main incomers. The surge current withstand is 250 A (8/20 µs impulse), tested to EN/IEC 61008-1. That means it can ride through lightning-induced or switching transients without nuisance tripping, as long as the surge stays under that peak. Mechanical durability is 20,000 cycles, electrical durability (AC-1 resistive load) is 15,000 cycles. For an RCCB that's seldom switched under load, those numbers are more about the toggle mechanism's lifespan than frequent operation. The instantaneous trip time means no intentional delay — it clears a ground fault as fast as the technology allows. IP20 on the device body (finger-safe), IP40 inside a modular enclosure — so it's not for washdown areas, but fine inside a locked panel.
Termination and wiring notes
Wire stripping length is 14 mm. That's a generous wire range — it'll take a 35 mm² incoming feed and still handle 1 mm² for the outgoing tails. Spring-cage it is not; these are screw terminals, so torque-strip the screwdriver bit. The contact position indicator shows whether the contacts are actually open or closed, not just the toggle position.
Sourcing is straightforward: we can quote the A9R81440 to order against an RFQ. If you're planning a panel build or a spares kit, this is a stable line item that won't trigger a redesign cycle.