The Schneider Electric A9R51425 is an Acti9 iID residual current circuit breaker (RCCB) — a 4-pole, voltage-independent device rated for 25 A continuous current and 30 mA earth-leakage sensitivity.
The 30 mA sensitivity (Type A) detects sinusoidal AC and pulsating DC residual currents — the standard for general-purpose socket-outlet and lighting circuits in residential and commercial panels. The 25 A rating matches the incoming feed for a sub-distribution board or a heavy appliance circuit. Instantaneous trip (no intentional delay) means it clears earth faults immediately, so selectivity with upstream time-delay RCCBs or RCBOs must be checked during coordination study. Rated breaking capacity Idm 1500 A covers most final-circuit fault conditions within a domestic or light commercial installation. The insulation voltage (Ui) of 500 V AC and impulse withstand (Uimp) of 6 kV give headroom for transient overvoltages common on TN and TT systems.