The C063N35EFM is a 3-pole 630 A molded-case circuit breaker from Schneider Electric's ComPacT NS new generation line, fitted with a MicroLogic 5.0 E electronic trip unit. It's a distribution-grade breaker (category B per IEC 60947-2) with an energy-metering function built into the trip unit — so it reports consumption data through the LCD display, not just trips. The 630 A rating at 50 °C means it carries full current in a warm panel without derating; above that ambient you'd need to consult the thermal curve.
MicroLogic 5.0 E gives you LSI protection — long-time overload (L), short-time short-circuit (S), and instantaneous (I) — plus the energy-metering function that tracks kWh, power, and demand through the LCD. The thermal memory holds for 20 minutes after a trip, so it remembers the heat profile if you reclose quickly on a hot breaker. That matters for motor or transformer feeders where repeated starts can accumulate heat. The electronic trip is field-adjustable, so you can dial in the pickup and time bands without swapping the trip unit. No earth-leakage protection on this variant (the E suffix means energy metering, not earth fault).
Fixed mount on a backplate — no draw-out cradle, no DIN-rail clip. The 210 mm width, 327 mm height, and 147 mm depth are the envelope you need to clear in the enclosure. Connection pitch is 70 mm between poles, front-connected both top and bottom, so busbar or cable routing is straight in and out. IK07 impact rating means it survives a hammer knock during panel work. Pollution degree 3 per IEC 60947 — it's rated for conductive environments, not just clean control rooms.
Operating altitude rated to 2,000 m without derating, 2,000 to 5,000 m with derating (air density affects arc extinction). Relative humidity 0 to 95% — no condensation concern in normal indoor gear.