The Schneider Electric C25N44V100 is a 4-pole ComPacT NSX moulded-case circuit breaker with a MicroLogic 4.2 electronic trip unit, rated 100 A at 40 °C.
The C25N44V100 carries a 90 kA Icu at 240 V AC, 50 kA at 415 V, and still 10 kA at 690 V AC. The 10 kA at 690 V is enough for 690 V line-to-line systems common in mining or heavy industrial, though the 36 kA at 500 V and 35 kA at 525 V cover the intermediate voltage bands. For UL 489 installations, it also carries 85 kA at 240 V, 50 kA at 480 V, and 15 kA at 600 V AC.
Mounts on a backplate — the 161 mm height, 140 mm width, and 86 mm depth fit the standard ComPacT NSX cutout. The toggle control is manual; no motor operator is integrated, so plan for remote tripping via the MicroLogic 4.2's shunt trip or undervoltage release slot if needed.
Protection curve and thermal memory
The MicroLogic 4.2 is an electronic trip unit, so it gives you a flat, repeatable trip curve — no thermal bimetallic drift. The L protection (long-time) is adjustable; the So (short-time) has a fixed delay; the I (instantaneous) is fixed; and the R (earth-leakage) is integrated. That means if the breaker trips on overload and you reset it quickly, it remembers the prior heat and will trip faster on a second overload within that window — a real advantage for motor starting or cyclic loads where you don't want nuisance trips on a cold start but need protection on a hot restart.