The Schneider Electric A9Z35280 is a 2-pole (2P) residual current circuit breaker (RCCB) from the Acti9 iID series, rated for 80 A continuous current at 220-240 V AC, 50/60 Hz. It provides earth-leakage protection with a 300 mA sensitivity and is classified as Type A-SI (Super Immunised), meaning it handles pulsed DC residual currents and is immune to nuisance tripping from high-frequency leakage typical of modern electronic loads. The voltage-independent tripping mechanism operates without an auxiliary supply, so it clears a ground fault even if the line voltage collapses.
The 80 A rating (In) is the continuous current the RCCB can carry without derating in a 30 °C ambient — match it to the load side of your distribution board. The 300 mA sensitivity is a selective (time-delayed) trip threshold, per, which coordinates with downstream 30 mA RCCBs so only the faulted circuit opens, not the whole board. The Type A-SI classification covers sinusoidal AC and pulsating DC residual currents plus a high immunity to surge-induced tripping — important for circuits with VFDs, UPS systems, or switched-mode power supplies that generate leakage at higher frequencies. The breaking and making capacity is 1500 A (Idm/Im per) — sufficient for clearing high-impedance ground faults but not for direct short-circuit interruption; that is the upstream MCB or fuse's job. Electrical durability is rated at 10,000 cycles under AC-1 resistive load, and mechanical durability at 20,000 cycles.
The device occupies 4 module pitches of 9 mm each, so 36 mm total width. Depth is 73 mm, height 91 mm. Neutral is on the left. Terminals accept up to 35 mm² rigid or 25 mm² flexible, with a wire stripping length of 14 mm and a tightening torque of 3.5 N·m. The IP20 body is finger-safe; IP40 with the modular enclosure. A padlocking device and contact position indicator are standard.
Designed and certified to EN/IEC 61008-1 and EN/IEC 61008-2-1 — the harmonized European and international standards for RCCBs. The 8/20 µs impulse withstand of 3000 A confirms surge immunity per the same standard. The Type A-SI classification is a Schneider-specific enhancement over standard Type A, adding super-immunised characteristics for installations with electronic loads.