The Schneider Electric A9Z32463 is a 4-pole residual current circuit breaker (RCCB) from the Acti9 iID family, rated 63 A with 100 mA earth-leakage sensitivity. It protects against earth faults in AC networks at 380...415 V AC, 50/60 Hz, with a 10 kA rated conditional short-circuit current (SCCR) — meaning it can safely interrupt a fault up to that level without upstream damage. The Type A-SI (Super Immunised) classification means it handles pulsed DC fault currents from electronics (rectifiers, VFDs) while resisting nuisance tripping from high-frequency leakage typical of modern industrial loads. Voltage-independent tripping keeps it functional even if the neutral is lost.
Occupies standard panel space — plan for a full-width slot in your distribution board. Neutral on the left, toggle control, padlockable for lockout/tagout. Torque to 3.5 N·m. Strip length 14 mm. IP20 finger-safe with enclosure; IP40 in a modular enclosure.
The 100 mA sensitivity is higher than the typical 30 mA for personnel protection — this unit is sized for equipment protection or where higher leakage is expected (long cable runs, industrial machines). Electrical durability rated at 15,000 cycles under AC-1 (resistive) load; mechanical durability 20,000 cycles. That's a solid service life for a distribution board RCCB — not a daily-switched device, but it holds up under normal breaker operation.