The A9R04225 is a Schneider Electric Acti9 iID residual current circuit breaker (RCCB), a 2-pole device rated at 25 A with 300 mA earth-leakage sensitivity. The voltage-independent trip mechanism means it clears a ground fault even if the line voltage has collapsed, which is the deciding factor for outgoer protection in a distribution board where a lost neutral could otherwise leave a fault live.
The 73.5 mm depth and 91 mm height keep it within the standard modular enclosure footprint. Tightening torque 3.5 N.m top or bottom. Wire strip length 14 mm. IP20 body, IP40 inside a modular enclosure. Pollution degree 3 — rated for the conductive environment inside a typical industrial panel, not just clean office switchgear.
Rated insulation voltage 500 V AC, impulse withstand 6 kV. Breaking capacity Idm 1500 A, Im 1500 A. Electrical durability 15,000 cycles under AC-1 resistive load; mechanical durability 20,000 cycles. The 8/20 µs impulse withstand of 250 A means it survives surge events without nuisance tripping — relevant on circuits exposed to lightning-induced transients.