The Schneider Electric C063N460FM is a ComPacT NS630b...1600 new generation molded-case circuit breaker, four-pole, rated 630 A at 50 °C with a MicroLogic 6.0 electronic trip unit. It delivers 50 kA Icu at 415 V AC (50/60 Hz) per IEC 60947-2, making it a solid choice for distribution panels where you need selectivity and short-circuit coordination downstream of a transformer.
The 630 A frame gives you headroom on a 400–600 A feeder — you're not running it at the limit, so thermal memory (20 min reset) won't nuisance-trip on a warm motor start. The MicroLogic 6.0 covers L, S, I, and G protection curves; the G (ground-fault) function is built into the trip unit, so you don't need an external relay for earth-leakage on solidly-grounded systems. Category B utilisation means the breaker is designed for discrimination (selectivity) with downstream devices — the short-time delay (S) lets you coordinate with feeder breakers upstream. Breaking capacity steps: 85 kA at 240 V, 50 kA at 415 V, 40 kA at 525 V, 30 kA at 690 V. If your service entrance is 480 V (nominal 480/277 V), you're looking at roughly 50 kA Icu — enough for most industrial distribution transformers up to 1500 kVA. The IP40 front face and IK07 impact resistance handle accidental tool drops in a panel; not washdown-rated, so keep it inside the enclosure. Mechanical durability is 10,000 cycles; electrical durability ranges from 2,000 cycles at full load (690 V In) to 6,000 cycles at half load (440 V In/2). For a main breaker that cycles only a few times a year, that's effectively life-of-installation. The fixed mount and front-connect terminals (upside and downside) simplify bus-bar layout — 70 mm connection pitch matches standard Schneider panelboard patterns.