The Schneider Electric A9Z12263 is an Acti9 iID residual current circuit breaker (RCCB) — a 2-pole, 63 A device with 100 mA earth-leakage sensitivity, Type AC, rated for 220-240 V AC at 50/60 Hz. The 100 mA sensitivity makes it a good fit for general-purpose circuits where nuisance tripping from normal leakage is a concern — think sub-mains, feeders, or whole-floor protection rather than individual socket outlets.
Rated at 63 A continuous, this RCCB handles the full load of a typical residential or light-commercial sub-main without derating at the standard 30 °C ambient. The 100 mA sensitivity (Type AC) detects sinusoidal AC earth faults only — not pulsed DC or smooth DC, so it is not suitable for circuits with VFDs, UPS systems, or EV chargers that generate non-sinusoidal leakage. The 2-pole (2P) form factor with neutral on the left occupies 4 x 9 mm pitches (36 mm wide) on the DIN rail — a standard two-module width for a double-pole RCCB. The voltage-independent tripping mechanism means the device does not need an auxiliary supply to detect leakage; it trips purely on the residual current itself, which is a reliability advantage in installations where neutral loss could otherwise leave a voltage-dependent RCCB blind.
The 14 mm wire stripping length and 3.5 N·m tightening torque are standard for this class.