The C063N350FM is a Schneider Electric ComPacT NS new generation 3-pole molded case circuit breaker (MCCB) rated 630 A at 50 °C, fitted with a MicroLogic 5.0 electronic trip unit offering LSI protection — long-time overload (L), short-time short-circuit (S), and instantaneous short-circuit (I). It's a manually operated, fixed-mount unit for distribution applications, compliant with EN/IEC 60947-2. The 50 kA breaking capacity code at 415 V AC (85 kA Icu at 240 V) gives you solid fault-clearing headroom for most industrial panel feeds.
Push it to 60 °C and you'll need to consult the thermal derating curve. For the service breaking capacity (Ics), expect 100% of Icu on this class — meaning it can clear a 50 kA fault and be immediately reclosed, which matters for coordination studies. The MicroLogic 5.0 trip unit is fully electronic, so you get adjustable L, S, and I curves via the front dials — no thermal bimetal drift over time. The 20-minute thermal memory means the breaker remembers prior heating events and shortens the trip time on a reclose, which is useful for motor starting or capacitor bank switching where repeated inrush occurs. The 10,000 mechanical cycles and 2,000 electrical cycles at rated current tell you this is a distribution breaker, not a switching device for daily motor starts. If you need frequent load switching, look at a contactor upstream. The IP40 front-face protection means it's splash-proof from the front but not sealed — mount it inside a panel rated for the environment. The IK07 impact rating handles accidental tool drops during maintenance.
Integration notes
Fixed-mount on a backplate — no DIN rail adapter on this frame size. The 210 mm width and 327 mm height need a cutout or mounting plate sized accordingly. Front connection both upstream and downstream with a 70 mm connection pitch — standard for busbar or cable lug termination. The manually operated control means no motor operator or shunt trip included; those are optional accessories.