The A9Z25263 is a 2-pole residual current circuit breaker (RCCB) from the Acti9 iID series, rated 63 A continuous current with a 300 mA Type A earth-leakage sensitivity and selective time delay. The 63 A frame covers the main incoming feeder or sub-feed for a distribution board on a 220–240 V AC 50/60 Hz network. The selective (S-type) delay coordinates with downstream RCCBs: it holds off tripping for a short interval so the downstream device clears first, keeping the upstream supply alive for the rest of the panel. Rated conditional short-circuit current is 10 kA (Idm 1500 A, Im 1500 A), and the insulation voltage is 500 V AC with impulse withstand at 6 kV. The enclosure itself carries IP40 when fitted in a modular enclosure, so it suits clean, dry cabinet installations.
Neutral is on the left. Terminals accept double conductor entry: front terminals 1–35 mm² rigid, 1–25 mm² flexible; back terminals 1–25 mm² rigid. The toggle control, contact position indicator, and padlocking provision are standard for lockout/tagout.