Schneider Electric C11N4TM063L ComPacT NSXm, 63 A, 50 kA 415

In a panel with a transformer or utility feed capable of delivering 50 kA symmetrical, this breaker clears the fault without rupturing. The N performance level means it's the standard interrupting rating for the NSXm frame; if your available fault current is higher, you'd step to an H or L version. The thermal-magnetic TM-D trip unit gives you an adjustable thermal (overload) curve and a fixed magnetic (short-circuit) pickup. For a 63 A feeder, the magnetic trip typically fires at around 10x In, so 630 A instantaneous—fast enough to protect against bolted faults but coordinated with downstream 10-20 A branch breakers. The 4P (4-pole) configuration with neutral on the left handles three-phase plus neutral distribution. The neutral pole is switched and protected—important for TN-S or TT systems where you need to isolate the neutral for maintenance or where earth-leakage detection requires a switched neutral.