The C063L450FM is a Schneider Electric ComPacT NS new generation 4-pole circuit breaker, rated 630 A at 50 °C with a MicroLogic 5.0 electronic trip unit. The electronic trip unit gives you LSI protection curves: long-time overload, short-time short-circuit, and instantaneous short-circuit, plus a 20-minute thermal memory so it doesn't reset its heat history on a fast reclose.
For a 630 A frame, that's a high-interrupting rating, typically specified for large transformer secondaries or heavy industrial feeders where fault current can hit 100 kA+. The 130 kA at 440 V and 100 kA at 500 V tell you the breaker derates as voltage climbs, but it still holds 100 kA at 500 V, which covers most 480 V北美 panels. The MicroLogic 5.0 trip unit is fully electronic, so you get adjustable long-time pickup (Ir), short-time pickup (Isd) with a time delay, and instantaneous (Ii) — no thermal bimetal to drift. The 20-minute thermal memory means if you reclose after a trip, the breaker remembers the prior heat and trips faster on the next overload, which matters for motor starting or capacitor bank switching where repeated inrush can cook the cable.
Panel integration & mounting
Fixed mount on a backplate — no DIN rail on a 630 A frame. Dimensions are 327 mm high, 280 mm wide, 147 mm deep. That's a substantial footprint; plan for a 70 mm connection pitch on the busbars. Front connection both top and bottom, so you can cable it without rear access. IP40 enclosure protection, IK07 impact resistance — fine for a clean indoor switchboard, not for washdown. Neutral is on the left, which matters for busbar phasing if you're paralleling with other breakers.