The Schneider Electric A9KR14463BQ is a 4-pole residual current circuit breaker (RCCB) from the Acti9 ID K range, rated at 63 A with 300 mA earth-leakage sensitivity. The 63 A rating and 300 mA sensitivity make it a fit for group incomer duty in a distribution board where you need whole-circuit ground-fault protection rather than individual branch protection.
Mounts on DIN rail via clip-on, and at 72 mm wide (4 modules at 18 mm each) it takes up standard panel space for a 4P device. Terminals accept up to 35 mm² rigid or 25 mm² flexible — enough for 63 A incoming tails — and the tightening torque is 3.5 N.m top or bottom. Strip length is 14 mm. The biconnect terminals let you loop out without an extra bar, which wires up clean in a group incomer position.
Rated breaking and making capacity is Idm 630 A / Im 630 A — that's the short-circuit capacity for this RCCB under the product standard. The device is voltage-independent for residual current tripping, so it doesn't need an external supply to detect a ground fault. Electrical durability is 4000 cycles under AC-1 (resistive load); mechanical durability is 5000 cycles. The IP20 rating on the body (IP40 in a modular enclosure) means it's for dry indoor panels only — no washdown exposure.
Lifecycle stage is marked as current production. The part complies with IS 12640-1, EN/IEC 61008-1, and EN/IEC 61008-2-1 — the Indian and international standards for RCCBs. Storage temperature range is -25 to 85 °C; operating ambient isn't explicitly stated, but the tropicalisation class 2 per IEC 60068-1 suggests it's treated for damp-heat environments up to 95 % RH at 55 °C.