The Schneider Electric EZC400N3300N is a 3-pole molded case circuit breaker from the EasyPact EZC400N series, built for distribution applications. The breaking capacity hits 36 kA Icu at 440 V AC 50/60 Hz per IEC 60947-2, with a magnetic trip threshold set at 4000 A. That 36 kA figure at 440 V is the rating that governs fault-clearing capability on a 400 V distribution bus — enough headroom for most industrial panelboards without stepping up to a higher frame.
Dimensions are 255 mm high, 140 mm wide, 110 mm deep — fits a standard panel footprint for a 400 A frame. Connection pitch is 44 mm. IP20 finger-safe protection on the front face; IK07 impact resistance means it handles incidental tool contact during panel wiring.