EasyPact NW ENW24253 — 800 A Air Circuit Breaker
The Schneider Electric ENW24253 is an EasyPact NW air circuit breaker rated 800 A at 40 °C, with a breaking capacity of 66 kA Icu at 220...440 V AC 50/60 Hz per IEC 60947-2. It is a 4-pole (4P) fixed-mount unit with rear vertical/horizontal connections and a 115 mm connection pitch without spreader. The IP40 enclosure suits indoor distribution panels where dust ingress is limited but not washdown.
At 690 V AC the Icu drops to 50 kA, and the Ics (service breaking capacity) mirrors those values — 65 kA at 440 V, 50 kA at 690 V. The Icw (short-time withstand) is 65 kA for 1 s at 440 V, 36 kA for 3 s at 440/690 V. That 3 s rating matters for selective coordination downstream: the breaker holds closed through a fault long enough for a branch device to clear, avoiding a full panel blackout. Category B utilisation confirms it is designed for selectivity, not just cable protection.
Fixed mounting on a base plate. Rear connection position, vertical or horizontal orientation. The 115 mm connection pitch without spreader matches standard busbar drilling patterns for 800 A class breakers. Neutral is on the right. Pollution degree 4 per IEC 60664-1 means it handles conductive dust and heavy condensation — typical for industrial switchrooms, not clean conditioned spaces.
Electrical Durability and Duty
Mechanical durability: 20,000 cycles with maintenance, 10,000 without. Electrical durability at 440 V AC: 6,000 cycles Category B without maintenance, 4,000 cycles at 690 V. Maximum breaking time 25 ms, maximum closing time 70 ms.