The Schneider Electric A9R71425S is an Acti9 iID residual current circuit breaker (RCCB) with 4 poles, rated at 25 A and 30 mA earth-leakage sensitivity. Rated operational voltage is 380...415 V AC at 50/60 Hz, with a breaking and making capacity of 1500 A (Idm/Im).
The 30 mA sensitivity is the standard threshold for personal protection against indirect contact in residential and commercial final circuits per IEC 60364. The 25 A rating matches a typical 4-pole outgoing feeder for a mixed load (lighting, small motor, socket outlets) on a 400 V three-phase supply. Type AC means this RCCB will not trip on pulsed DC fault currents from VFDs, UPS systems, or LED drivers — if the downstream load includes any power electronics, a Type A or Type F device is needed instead. The instantaneous trip characteristic (no intentional time delay) means it clears earth faults within the standard 300 ms window, but it cannot provide selectivity with downstream RCCBs. For graded protection, a time-delayed S-type RCCB would be required upstream. The IP20 enclosure protection is standard for panel-mounted devices; the IP40 rating applies when installed in a modular enclosure.
The device occupies 8 modules of 9 mm pitch (72 mm total width). Neutral is on the left. Terminals accept 1...35 mm² rigid or 1...25 mm² flexible conductors; strip length is 14 mm. A padlocking device is available for lockout/tagout.