It is rated 63 A at 400 V AC with a 300 mA residual trip threshold and a 10 kA short-circuit current rating — sized for main incoming protection or sub-distribution in a 50 Hz TN or TT system.
The 63 A continuous rating and 300 mA trip mean this RCCB handles a full 3-phase + N load up to that current before the residual-current element opens the circuit on ground faults above 300 mA. Instantaneous design means no intentional time delay; it trips within a cycle on fault. Conductor range accepts 1.5 to 25 mm² solid or stranded — covers standard building-wire sizes from 14 AWG through 4 AWG. Terminal torque spec is 2.5 to 3 N·m. IP20 with conductors connected — panelboard installation only, not wet locations.