The ENW24239 is a Schneider Electric EasyPact NW 4-pole fixed circuit breaker rated 1250 A at 40 °C. That 1250 A continuous rating governs the main feeder or bus tie it can protect — size the upstream transformer or generator accordingly. The 50 kA Icu at 220…440 V AC tells you it can safely interrupt a fault up to that level without rupturing; below 440 V the full 50 kA holds, at 690 V it derates to 42 kA Icu. The Ics service breaking capacity matches the Icu at both voltage levels, meaning after clearing a fault at rated breaking capacity the breaker remains functional — no immediate replacement needed for a downstream short. The IP40 enclosure keeps out tools and wires over 1 mm but is not sealed against moisture — mount indoors or in a cabinet.
Deployment context
This is a fixed-mount breaker on a base plate, not a draw-out unit — plan for bolted connections and rear access. The 537 mm width, 352 mm height, and 297 mm depth define the panel cutout and enclosure size. Connection pitch is 115 mm without spreader, which matters when laying out bus bars or cable lugs. The neutral is on the right. Category B utilisation means it's designed for distribution duty with no intentional delay on short-circuit — coordination studies should treat it as instantaneous above the magnetic pickup.
Designed and tested to IEC 60947-2 for low-voltage switchgear and controlgear. Electrical durability at 440 V is 6,000 cycles without maintenance, dropping to 4,000 cycles at 690 V. Maximum breaking time is 25 ms; maximum closing response time is 70 ms.