The Schneider Electric ENW24116 is an EasyPact NW air circuit breaker rated 4000 A at 40 °C, with a 55 kA Icu breaking capacity at 220…440 V AC 50/60 Hz per IEC 60947-2. Three-pole (3P), fixed-mount on a base plate, with rear vertical or horizontal connection. IP40 protection makes it suitable for indoor switchgear — clean, dry environments where dust ingress is minimal. The unit is Category B (selective) per IEC 60947-2, meaning it's designed for full discrimination with downstream breakers, so a fault on a feeder won't take the main bus down.
Rated service breaking capacity and withstand
Ics (service breaking capacity) matches Icu at 55 kA for 220…440 V AC and 42 kA at 690 V AC — that means after one fault interruption at those levels, the breaker is still rated to carry and switch its full load current. Short-time withstand (Icw) is 42 kA for 1 s at 690 V, 55 kA for 1 s at 440 V, and 30 kA for 3 s across the 440/690 V range. That 3-second rating is what lets you coordinate with downstream breakers for selective tripping: the main holds in for a delayed fault while the feeder clears.