The C100N42AFM is a fixed-mounted, manually operated 4-pole air circuit breaker from the ComPacT NS new generation family, rated 1000 A at 50 °C. Its MicroLogic 2.0 A electronic trip unit provides L (long-time overload) and I (instantaneous short-circuit) protection — no ground-fault or short-delay element, so selectivity studies need to account for that. The 85 kA Icu at 220/240 V AC (50 kA at 415 V AC) means it can interrupt fault currents up to that level without failing; for a 1000 A main breaker in a 480 V distribution panel, the 50 kA at 415 V AC is the figure to coordinate upstream. The breaker is Category B (IEC 60947-2), meaning it is intended for distribution and has a rated short-time withstand current — it can pass through a delayed trip without damage.
Integration and deployment
Mounts fixed to a backplate — not DIN-rail — so plan for a dedicated panel cutout. Dimensions are 327 mm high × 280 mm wide × 147 mm deep, with a 70 mm connection pitch. The LCD display and ammeter measurement give local current readout without an external meter. IP40 protection means it is suited for indoor switchgear enclosures; IK07 impact resistance handles incidental contact during maintenance.