The Schneider Electric A9Z32291 is a 2-pole Acti9 iID residual current circuit breaker (RCCB) rated for 100 A continuous current with a 100 mA earth-leakage sensitivity. It is a Type A-SI (Super Immunised) device, meaning it is voltage-independent and designed to withstand high-frequency transient surges and pulsed DC currents that would nuisance-trip a standard Type A or AC RCCB. This makes it suitable for circuits with electronic loads, variable-speed drives, or LED lighting where smooth DC fault currents may be present. Terminals accept conductors up to 35 mm² rigid (top/bottom dual terminals), and the tightening torque is specified at 3.5 N.m.
The 100 A rated current (In) sets the continuous load capacity; this RCCB is sized for a main incoming supply or a heavy sub-feed in a distribution board. The 100 mA sensitivity is a delayed-action characteristic for earth-leakage protection — it is not a 30 mA personal-protection device, but rather a fire-protection or equipment-protection threshold, commonly specified for circuits supplying fixed equipment where a lower sensitivity would cause nuisance tripping from natural leakage. The Type A-SI classification (Super Immunised) per EN/IEC 61008-1 means the device can handle pulsed DC residual currents up to 10 mA and is immune to surge currents up to 3 kA (8/20 µs waveform) without tripping. This is critical for circuits containing single-phase rectifiers, switched-mode power supplies, or variable-frequency drives that generate smooth DC fault components.
The device is fully compliant with EN/IEC 61008-1 and EN/IEC 61008-2-1, the harmonized standards for residual current operated circuit breakers without integral overcurrent protection. The IP degree of protection is IP20 (device) and IP40 (modular enclosure).