The ETU850 electronic trip unit provides adjustable protection curves, and the shunt trip (STL) release allows remote tripping — a safety requirement for emergency-stop circuits. No ground-fault monitoring or auxiliary contacts on this variant, so plan those externally if the application needs them.
The 630 A rating holds only at 40 °C ambient. Above that, derate: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C (–). If the panel ambient runs 50 °C, the breaker's usable current drops to 570 A — size the upstream transformer and bus accordingly.
That 110 mm depth matters for enclosure depth — standard 200 mm deep enclosures have clearance for wiring and the shunt trip wiring tray. Width of 138 mm determines the DIN-rail or mounting-plate spacing; allow at least 150 mm per breaker for adjacent units and cable bending radius.