The Schneider Electric A9KR13463S is a 4-pole residual current circuit breaker (RCCB) from the Acti9 ID K series, rated at 63 A with 30 mA earth-leakage sensitivity.
The 63 A rated current (In) and 30 mA sensitivity define its core protection role: it will trip on earth faults above 30 mA while carrying the full 63 A load continuously. Breaking capacity is rated at Idm 630 A and Im 630 A, which covers the fault-clearing requirement for most sub-distribution boards. The instantaneous trip characteristic (no intentional delay) means it responds to leakage within milliseconds, per EN/IEC 61008-1. The voltage-independent tripping technology means the RCCB will open on a residual current even if the line voltage is lost — a safety advantage over electronically tripped units that require a control supply to operate. Physical fit: 72 mm wide (4-pole, 8 x 9 mm pitches), 81 mm tall, 68 mm deep. Terminals accept 1...35 mm² rigid or 1...25 mm² flexible conductors, with a 3.5 N.m tightening torque and 14 mm strip length. IP20 on the body, IP40 in a modular enclosure.