The Schneider Electric A9Z24263 is a 2-pole residual current circuit breaker (RCCB) from the Acti9 iID family, rated 63 A with 300 mA earth-leakage sensitivity. The 300 mA threshold is the standard choice for whole-circuit protection in commercial and industrial sub-distribution boards — it tolerates normal leakage from power supplies and motor drives without nuisance tripping, unlike a 30 mA unit which is sized for personal shock protection on socket-outlet circuits. Type A detection means it catches sinusoidal AC faults plus pulsating DC faults up to 6 mA smooth DC superimposed, covering the rectified waveforms from single-phase electronics and variable-speed drives. Voltage-independent tripping means the device disconnects on earth leakage even if the line voltage collapses, a reliability advantage over electronically-triggered units.
Clip-on mounting to DIN rail, 36 mm width (4 x 9 mm pitches), 91 mm height, 73 mm depth. Occupies two modular spaces in a standard enclosure. Neutral on the left. Tightening torque 3.5 N.m. IP20 finger-safe on the front; IP40 within a modular enclosure. Padlocking device provision for lockout/tagout during maintenance.