The Schneider Electric A9Z21263 is an Acti9 iID residual current circuit breaker (RCCB) — a 2-pole, 63 A, 30 mA sensitivity device for AC networks at 50/60 Hz, rated 220...240 V AC.
The 63 A rated current matches the incoming supply for a sub-distribution board or a high-load final circuit. The Type A classification means it detects sinusoidal AC residual currents plus pulsed DC residual currents, covering modern loads with rectifiers (switch-mode supplies, variable-speed drives, LED drivers) that a simple AC-type RCCB would miss. The instantaneous trip means no intentional delay — it clears a ground fault within the natural response time of the voltage-independent trip mechanism, which does not rely on the line voltage to operate. The 73 mm depth and 91 mm height fit standard modular enclosure cutouts; the clip-on mounting snaps onto a DIN rail without tools. Terminals accept up to 35 mm² rigid or 25 mm² flexible conductors, with a stripping length of 14 mm and a tightening torque of 3.5 N·m — typical for a 63 A device in a panel.