The Schneider Electric A9R75463 is a 4-pole residual current circuit breaker (RCCB) from the Acti9 iID K series, rated at 63 A with 300 mA earth-leakage sensitivity. It is a Type AC device — designed to trip on sinusoidal AC residual currents — and uses voltage-independent tripping technology, meaning it operates without needing an external power supply to the electronics. This makes it a straightforward fit for outgoing feeder protection in distribution boards where the fault path is purely AC.
Earth-leakage protection is instantaneous (no time delay), so it trips as soon as the residual current exceeds 300 mA. This sensitivity level is typical for general-purpose protection against fire risk from leakage currents in fixed wiring, rather than personnel protection (which would require 30 mA or lower). The 8/20 µs impulse withstand of 200 A per EN/IEC 61008-1 ensures the RCCB does not nuisance-trip on transient surges like lightning-induced spikes. Electrical durability is rated at 2000 cycles under AC-1 (resistive load) conditions, and mechanical durability at 5000 cycles. These are not high-cycle numbers — this RCCB is specified for the distribution board, not for frequent switching duty. If your application requires daily load switching, a contactor or switch-disconnector should handle that function upstream.
Strip length is 16 mm. IP20 rated (finger-safe) with IP40 inside the modular enclosure — standard for distribution boards.