The Schneider Electric EZC400N3350 is a 3-pole molded case circuit breaker from the EasyPact EZC400N range, rated 400 A at 40 °C with a TM-D thermal-magnetic trip unit. It provides short-circuit and overload protection for distribution feeders, with a breaking capacity of 36 kA Icu at 440 V AC (50/60 Hz) per IEC 60947-2. The trip unit is field-adjustable? No — the TM-D is a fixed thermal-magnetic unit; the magnetic trip is set at 3200 A (8x In). For a 400 A feeder, that gives a good balance between nuisance immunity and short-circuit protection.
Fixed mounting on a backplate, with front connections both top and bottom. Dimensions: 255 mm high, 185 mm wide, 140 mm deep. That's a compact footprint for a 400 A frame — fits in a standard distribution panel without needing a deep enclosure. IP20 finger-safe protection on the front, IK07 impact resistance. The toggle gives positive contact indication, so you can visually confirm the contact position.