The C11N4TM063B is a Schneider Electric ComPacT NSXm moulded-case circuit breaker, 4-pole, rated 63 A at 40 °C with a thermal-magnetic TM-D trip unit. Its 50 kA breaking capacity at 415 V AC (performance level N) means it clears high-fault currents on a 400 V distribution board without the breaker welding shut — that's the number that decides whether this holds up on a line-side transformer feed or a heavy motor branch.
The 63 A continuous rating at 40 °C is the load it carries without tripping — sized for a 63 A feeder or a group of motor starters. EN/IEC 60947-2 certifies it as a circuit breaker for industrial distribution, not just a residential panel breaker. The 4-pole (4P) configuration switches all three phases plus the neutral, common in North American or export panels where the neutral needs overcurrent protection.
The 108 mm width and 137 mm height fit a standard MCC bucket or panel cutout. Front-connect terminals accept compression lugs or busbars; the 35 mm connection pitch with spreaders matches common busbar layouts.