The Schneider Electric A9KR11463BQ is a 4-pole residual current circuit breaker (RCCB) from the Acti9 ID K series, rated 63 A continuous current with 30 mA earth-leakage sensitivity.
The 30 mA sensitivity is instantaneous (no time delay), so it trips on the first half-cycle of a ground fault — this is the standard for personnel protection in IEC 61008-1 circuits. The insulation voltage (Ui) is 440 V AC, so the internal clearances and creepage are sized for a 440 V system even though the operational voltage is capped at 415 V. That headroom matters when the supply rides high or when the RCCB is used in a corner-grounded delta configuration (rare, but the rating covers it).
Terminals accept rigid conductors up to 35 mm² or flexible up to 25 mm², with a stripping length of 14 mm and tightening torque of 3.5 N.m. The biconnect design allows top or bottom feed — useful when daisy-chaining through the same terminal without a separate busbar. IP20 on the body, IP40 inside a modular enclosure, so it needs a cabinet or distribution board to meet washdown or dust ingress requirements.
The Acti9 ID K family is a standard line, not a niche or phased-out variant.
The A9KR11463BQ is certified to IS 12640-1, EN/IEC 61008-1, and EN/IEC 61008-2-1. That covers the Indian standard and the European harmonized standard for residual current operated circuit-breakers without integral overcurrent protection. Pollution degree 2 (non-conductive pollution that becomes conductive only when condensation occurs) is the typical rating for enclosed distribution boards.