The Schneider Electric A9R51263 is a 2-pole residual current circuit breaker (RCCB) from the Acti9 iID series, designed for AC networks at 50/60 Hz. It protects against earth-leakage faults with a sensitivity of 30 mA — the standard threshold for personal shock protection in residential and commercial final circuits. The 63 A rated current (In) suits main incomers or high-load sub-distribution boards where the full load current passes through the device.
Voltage-independent tripping means the device clears a fault even if the line voltage is lost, a safety advantage over electronically-triggered RCDs. The instantaneous time delay provides no intentional delay, so it trips within the IEC 61008-1 standard response window, which is correct for socket-outlet and general-purpose circuits where fast disconnection is required. Breaking and making capacity is rated at Idm 1500 A and Im 1500 A, which covers the prospective fault current typical at the outgoer position in a domestic or light commercial distribution board. The surge current withstand of 250 A (8/20 µs impulse) means it tolerates lightning-induced or switching transients without nuisance tripping, a practical concern on overhead-supplied installations. Insulation voltage (Ui) is 500 V AC, giving headroom for system voltage variations.
Neutral is on the left; verify orientation before wiring. Terminals accept 1...35 mm² rigid or 1...25 mm² flexible cable; strip length 14 mm. Tightening torque 3.5 N.m. IP20 on the device body, IP40 inside a modular enclosure — suitable for panel mounting, not for wet-area standalone use.
Designed and certified to EN/IEC 61008-1, the harmonized standard for residual current operated circuit-breakers without integral overcurrent protection.