The Schneider Electric A9Z31425 is an Acti9 iID residual current circuit breaker (RCCB) — a 4-pole, 25 A device with 30 mA earth-leakage sensitivity, built for AC networks at 380...415 V, 50/60 Hz. Rated conditional short-circuit current is 10 kA, and the impulse withstand is 3000 A at 8/20 µs per EN/IEC 61008-1 — so it coordinates with a 10 kA upstream MCB in a standard domestic or light commercial panel.
The 25 A rated current and 30 mA sensitivity determine fit: the current rating must match or exceed the downstream load, while the sensitivity governs personnel protection. Voltage-independent tripping means the RCCB detects leakage and opens even if the phase voltage collapses — a safety advantage over electronically-triggered types that need auxiliary power. Terminals accept up to 35 mm² rigid on the front double terminal, with a stripping length of 14 mm and tightening torque of 3.5 N·m — standard for a 25 A RCCB in a distribution board.
Certified to EN/IEC 61008-1 and EN/IEC 61008-2-1 — the core standards for residual current operated circuit-breakers without integral overcurrent protection for household and similar uses.