The Schneider Electric C063N450FM is a ComPacT NS new generation 4-pole circuit breaker with a MicroLogic 5.0 electronic trip unit rated 630 A at 50 °C. It's built for distribution duty in fixed-mount backplate installations, so it bolts into a switchboard or panel — not a snap-on DIN rail job. With a 147 mm depth and 280 mm width, it takes up a defined footprint you can lay out in the cabinet layout. The breaking capacity is 85 kA Icu at 220/240 V AC and 50 kA Icu at 380/415 V AC, both per IEC 60947-2.
If your panel runs hotter than that, you'll need to derate per the manufacturer's curve — that's standard for any molded-case breaker. The MicroLogic 5.0 gives you LSI protection: long-time (L) for overload, short-time (S) for low-level short circuits, and instantaneous (I) for high faults. That's a step up from a thermal-magnetic unit because you can tune the S pickup and delay for selective coordination downstream. Electrical durability is 2,000 cycles at 690 V at full rated current, and 6,000 cycles at 440 V at half current. That's not a daily-switching contactor — it's a distribution breaker meant to stay closed and only open on fault or for isolation. Mechanical durability is 10,000 cycles, which covers years of infrequent manual operation.
Fixed mount on a backplate, with front connections both upside and downside. Connection pitch is 70 mm, which matches standard busbar or cable lug spacing for this frame size. IK07 impact rating handles a 2 J hammer blow, so it survives a dropped wrench during commissioning.