The Schneider Electric A9R54463 is an Acti9 iID residual current circuit breaker (RCCB) — a 4-pole, 63 A device with 300 mA earth-leakage sensitivity, Type A, rated for 380...415 V AC networks. The 300 mA threshold suits it for submain or feeder protection where a higher trip level avoids nuisance tripping from equipment leakage, while Type A detection covers pulsating DC fault currents from electronics and rectified loads.
The 63 A rated current (In) governs the continuous load it can carry — sized for a subfeed or a group of downstream circuits, not a single high-load appliance. The 300 mA sensitivity is the trip threshold for earth leakage; this is not a 30 mA personal-protection device, so it is specified for equipment or fire protection, not direct touch protection. Rated breaking capacity is Idm 1500 A and Im 1500 A — this is the short-circuit current the RCCB can safely interrupt. In a typical installation, an upstream MCB or fuse provides the fault-clearing duty; the RCCB's role is leakage detection, not high-fault interruption. The voltage-independent tripping mechanism means the device does not need an external power supply to operate — it derives trip energy from the fault current itself, so it remains functional even if the neutral is lost upstream. Impulse withstand is 250 A at 8/20 µs waveform per EN/IEC 61008-1, meaning it will not nuisance-trip from common surge events like lightning-induced transients or capacitor switching. Pollution degree 3 indicates it is rated for the conductive environment inside a typical industrial panel (not a clean room).
The device occupies 8 modules of 9 mm pitch (72 mm total width). Height is 91 mm, depth 73.5 mm — standard for the Acti9 range, so it fits alongside other Acti9 MCBs and accessories on the same rail. Terminals accept 1...35 mm² rigid or 1...25 mm² flexible cable; wire stripping length is 14 mm. A padlocking device can be fitted for lockout/tagout.