The Schneider Electric A9R54263 is a 2-pole Acti9 iID residual current circuit breaker (RCCB) rated for 63 A continuous load on a 220...240 V AC 50/60 Hz network. The tripping is voltage-independent and instantaneous, so it clears a ground fault without relying on the line voltage to power the trip coil, and it does so without intentional delay.
The 63 A [In] rated current sets the maximum continuous load the RCCB can carry without nuisance tripping — sized for a main incomer or sub-feed on a residential or light commercial distribution board. The 300 mA sensitivity is the earth-leakage trip threshold; it is a common choice for fire protection (rather than personnel protection, which typically uses 30 mA) and is often specified for circuits supplying fixed equipment where a lower sensitivity would cause unwanted trips from normal leakage. Type A detection covers the waveform shapes produced by single-phase rectifiers, so this unit is appropriate for circuits feeding electronics, IT equipment, or appliances with switch-mode supplies. Breaking capacity is rated at Idm 1500 A and Im 1500 A — the fault-clearing capability for residual and overcurrent faults respectively. The rated impulse withstand voltage of 6 kV (Uimp) and insulation voltage of 500 V AC (Ui) confirm the unit can handle typical transient overvoltages on a 230/400 V supply network without internal flashover. Mechanical durability is 20000 cycles, electrical durability (AC-1 resistive load) is 15000 cycles — these are the expected lifetimes under normal switching duty. The unit is designed for infrequent manual switching (toggle control) as a disconnecting means, not for repeated daily switching like a contactor.
Clip-on mounting to a DIN rail, 36 mm width (4 x 9 mm pitches), 91 mm height, 73.5 mm depth — fits standard modular enclosure cutouts. Neutral is on the left. Terminals accept 1...35 mm² rigid or 1...25 mm² flexible (with or without ferrule); tightening torque 3.5 N.m; strip length 14 mm. IP20 finger-safe on the front face, IP40 inside a modular enclosure. Pollution degree 3 (conductive or dry non-conductive pollution) — suitable for control panels in industrial environments where some dust and condensation are present.