The Schneider Electric A9R75425 is a 4-pole Acti9 iID K residual current circuit breaker (RCCB) rated for 25 A continuous current with a 300 mA earth-leakage sensitivity. It operates on 380-415 V AC networks at 50/60 Hz and provides Type AC protection for sinusoidal AC fault currents. The voltage-independent trip mechanism means it clears a ground fault even if the phase voltage collapses — a key reliability feature for outgoer circuits where a lost neutral could otherwise mask a fault.
Neutral is on the left. Tunnel terminals accept 1-35 mm² rigid or 1-25 mm² flexible conductors; strip 16 mm and torque to 3.5 N.m. IP20 finger-safe on the front, IP40 inside a modular enclosure — standard for distribution board fit.
Rated breaking and making capacity is 500 A (Idm and Im) — sufficient for clearing a bolted fault downstream of a distribution board, though not a main breaker role. The 8/20 µs impulse withstand of 200 A means it survives common surge events without nuisance tripping. Electrical durability is 2000 cycles under AC-1 resistive load; mechanical durability is 5000 cycles. Ambient storage range is -40 to 85 °C.
Designed and certified to EN/IEC 61008-1 and EN/IEC 61008-2-1. Carries VDE quality label. Pollution degree 2 (normal industrial environment).