The Schneider Electric A9R04463 is a 4-pole residual current circuit breaker (RCCB) from the Acti9 iID series, rated 63 A continuous current with 300 mA earth-leakage sensitivity. The 300 mA sensitivity is the trip threshold for leakage to ground — it protects against fire risk from sustained arcing faults, not personnel shock (that requires 30 mA or lower). The trip mechanism is voltage-independent: it does not need a control voltage to operate, so it clears a ground fault even if the supply neutral is lost — a reliability advantage for safety continuity.
Clip-on mounting to a DIN rail, 72 mm wide, 91 mm tall, 73.5 mm deep — occupies 8 module pitches. Terminals accept 1…35 mm² rigid or 1…25 mm² flexible wire; strip 14 mm and torque to 3.5 N·m. IP20 finger-safe with the enclosure closed, IP40 inside a modular enclosure.