The Schneider Electric A9R54225 is an Acti9 iID residual current circuit breaker (RCCB) — 2 poles, rated 25 A continuous, with 300 mA earth-leakage sensitivity. It's Type A, meaning it catches sinusoidal AC faults plus pulsating DC residual currents up to 6 mA smooth DC, which covers most modern electronics and variable-speed drives on the line. The trip is voltage-independent, so it clears a ground fault even if the supply neutral is lost — a real advantage in older or poorly grounded installations where an electronic RCCB might stay closed on a fault.
Rated operational voltage is 220-240 V AC, 50/60 Hz. That's standard single-phase or split-phase line voltage across most of Europe, Asia, and the Middle East. The 25 A current rating suits sub-main or feeder circuits feeding a group of socket outlets, lighting, or small HVAC loads — not a single high-draw appliance. Breaking capacity is 1500 A (Idm/Im) per EN/IEC 61008-1, which is typical for a domestic or light-commercial RCCB; it's not designed for high-fault industrial panels where SCCR above 10 kA is common. Mechanical durability is 20000 cycles, electrical durability 15000 cycles at AC-1 resistive load.
Clip-on mount to DIN rail, 36 mm wide (2 module pitches at 9 mm each). Neutral is on the left. Terminals accept 1-35 mm² rigid or 1-25 mm² flexible (with or without ferrule). Tightening torque 3.5 N.m top or bottom. Wire strip length 14 mm. Padlocking provision for lockout/tagout. Standard 73.5 mm depth — fits any standard distribution board without depth clearance issues.