The Schneider Electric A9Z14291 is an Acti9 iID residual current circuit breaker (RCCB) — a 2-pole, 100 A device with 300 mA earth-leakage sensitivity, Type AC, rated for 220-240 V AC at 50/60 Hz. The 100 A rating means it handles full building-main or heavy industrial sub-feed loads; the 300 mA sensitivity is the standard for general-purpose protection against indirect contact in TN and TT systems, not the 30 mA needed for direct-personal shock protection.
The 100 A rated current (In) sets the continuous load limit — sized for a main switchboard or a large sub-distribution board feeding multiple circuits. The 300 mA sensitivity (IΔn) is the standard for fire protection and equipment protection in commercial/industrial panels; it will not trip on normal leakage from filters, drives, or long cable runs the way a 30 mA device would. Breaking capacity is rated at Idm 1500 A and Im 1500 A (the making/breaking capacity per EN/IEC 61008-1). The conditional short-circuit current is 10 kA, meaning the RCCB can withstand a 10 kA fault when backed by an upstream overcurrent device of appropriate rating. The impulse withstand is 250 A at 8/20 µs waveform — this is the surge-withstand rating for transient overvoltages, not a continuous rating.
Clip-on DIN rail mounting, neutral on the left. The IP20 body is standard for enclosed panel use; IP40 with the modular enclosure.