The Schneider Electric A9R82480 is a 4-pole residual current circuit breaker (RCCB) from the Acti9 iID series, rated 80 A with 300 mA earth-leakage sensitivity, Type AC, for 400…415 V AC 50/60 Hz networks.
The 80 A rated current (In) sets the continuous load it can carry without tripping — sized for a main incomer or heavy subfeed in a 3-phase board. The 300 mA sensitivity is a deliberate choice: it's above the 30 mA threshold for personal protection, so this RCCB is used for fire prevention or equipment protection on circuits where nuisance tripping from normal leakage (long cable runs, industrial loads) would be a problem. Type AC means it detects sinusoidal AC residual currents only — not pulsed DC or smooth DC — so it's suited for standard resistive and inductive loads without electronic rectifiers. Rated breaking and making capacity is 1500 A (Idm and Im), which covers the fault-clearing requirement for most sub-distribution boards fed by a larger upstream breaker. The instantaneous trip characteristic means no intentional delay — it clears a ground fault as soon as the residual current exceeds 300 mA.
The part complies with GB 16916.21 and EN/IEC 61008-1, the governing standards for residual current operated circuit-breakers without integral overcurrent protection. The 8/20 µs impulse withstand of 250 A per EN/IEC 61008-1 confirms it survives transient surges without nuisance tripping.