The Schneider Electric A9R46492 is a 4-pole Acti9 RCCB-ID residual current circuit breaker rated at 125 A with a 500 mA earth-leakage sensitivity, Type B, for 400 V AC 50 Hz networks. The instantaneous trip characteristic means it clears earth faults without intentional delay — suited for outgoing circuits where fast disconnection is required.
The Type B classification means this RCCB detects AC sinusoidal, pulsating DC, and smooth DC fault currents up to 500 mA — a requirement for circuits with variable-speed drives, UPS systems, or other power-electronics loads that can generate DC leakage. The 125 A rated current and 400 V operational voltage position it for main or sub-main distribution in commercial and industrial panels. The 3 kA impulse withstand (8/20 µs) per IEC/EN 61008-1 gives it reasonable surge immunity for typical installation environments.
The tunnel-type terminals accept up to 50 mm² rigid or 35 mm² flexible cable per pole. Tightening torque is 3 N·m, and wire stripping length is 11 mm. The red/green trip indicator gives local status at a glance. IP20 body protection is typical for enclosed distribution boards; the modular enclosure achieves IP40 within the panel.