The Schneider Electric A9Z31263 is an Acti9 iID 2-pole residual current circuit breaker (RCCB) rated for 63 A continuous load with 30 mA earth-leakage sensitivity. It is a Type A-SI (Super Immunised) device, meaning it handles pulsed DC fault currents from single-phase rectified loads and resists nuisance tripping from high-frequency leakage typical of VFDs, UPS systems, and LED drivers. The voltage-independent tripping mechanism means it clears a ground fault even if the phase voltage collapses — no auxiliary supply needed. Rated operational voltage is 220...240 V AC at 50/60 Hz, and it clips onto a standard DIN rail, occupying 4 x 9 mm pitches (36 mm wide).
The conditional short-circuit rating is 10 kA — the RCCB can be installed downstream of a 10 kA-rated upstream protective device (MCB or fuse) without being destroyed by a through-fault. In a domestic or light commercial panel fed by a 10 kA-rated main breaker, the 10 kA conditional rating is the number that governs coordination. The IP20 body is touch-safe but not splash-proof; the IP40 rating applies when installed in a modular enclosure.
The 36 mm width occupies 4 module pitches — plan your rail fill accordingly. Terminals accept up to 35 mm² rigid or 25 mm² flexible conductors, with a wire stripping length of 14 mm and a tightening torque of 3.5 N·m. Double-terminal design allows daisy-chaining the feed-through without a separate distribution block. Neutral is on the left. The toggle control provides a clear contact-position indicator and accepts a padlocking device for lockout/tagout.