The C11B3TM063B is a Schneider Electric ComPacT NSXm 63 A three-pole thermal-magnetic circuit breaker. It carries a 25 kA breaking capacity at 415 V AC (performance level B), enough for most distribution panelboard applications where fault currents stay under that threshold. The TM-D trip unit is fixed thermal-magnetic — no interchangeable electronic trip module, so the 63 A rating at 40 °C is what you spec into the BOM.
What the ratings mean for fit
The 25 kA at 415 V AC is the interrupting rating — it guarantees the breaker clears a fault up to that level without welding contacts or rupturing the case. Below that, it coordinates with downstream branch breakers. The 63 A thermal-magnetic trip protects against sustained overloads (thermal element) and short-circuits (magnetic instantaneous trip). Category A utilisation means it's not intended for motor-starting duty under IEC 60947-2; it's sized for distribution and feeder circuits. Mounts on a backplate (not DIN rail) with front connections top and bottom. The 9-module pitch at 81 mm wide means it occupies nine 9 mm positions in a panel. IP40 enclosure protection keeps dust out but not water — indoor panel use only.
Sourcing and lifecycle
Current-production lifecycle stage. Active catalogue item from Schneider's ComPacT NSXm family. Sourced and quoted to order against an RFQ through independent distribution.
Standards and approvals
Certified to EN/IEC 60947-2, the low-voltage switchgear standard. Suitability for isolation is confirmed per that standard — you can use it as a visible-break disconnect in a distribution panel. Pollution degree 3 (IEC 60664-1) suits it for industrial environments with conductive dust or condensation. Overvoltage category III covers fixed-installation applications downstream of the utility meter.