The Schneider Electric A9R91263 is a 2-pole residual current circuit breaker (RCCB) from the Acti9 iID series, rated at 63 A with 30 mA earth-leakage sensitivity. The Type A-SI (Super Immunised) classification means it handles pulsed DC fault currents and is immune to nuisance tripping from high-frequency leakage typical of modern switched-mode power supplies and inverters.
Terminals accept up to 35 mm² rigid or 25 mm² flexible, with a stripping length of 14 mm and a tightening torque of 3.5 N.m. The 36 mm width (4 modules) fits standard enclosures; the toggle actuator and padlocking provision allow lockout/tagout without removing the device. IP20 body, IP40 inside a modular enclosure — fine for clean indoor panels, not for washdown zones.
Rated operational voltage is 220...240 V AC at 50/60 Hz, with an insulation voltage of 500 V AC. The breaking capacity (Idm/Im) is 1500 A. Electrical durability is 15,000 cycles under AC-1 load; mechanical durability is 20,000 cycles. The residual current tripping is voltage-independent, so it clears faults even if the supply neutral is lost — a key safety feature for personnel protection. Ambient operating range is -25 to 60 °C, storage -40 to 85 °C, with pollution degree 3 (conductive pollution or dry non-conductive that becomes conductive).