The EZC400H4320N is a 4-pole EasyPact EZC400H moulded-case circuit breaker rated 400 A at 40 °C with a thermal-magnetic TM-D trip unit. The 50 kA Icu at 400–415 V AC is the interrupting capacity under IEC 60947-2 — it can safely clear a fault up to 50 kA without welding or rupturing. The TM-D trip unit's magnetic pickup is fixed at 5000 A, which is about 12.5× In — a typical instantaneous threshold for thermal-magnetic MCCBs protecting cable or distribution bus. Plan for that derating if the enclosure is tightly packed or poorly ventilated.
Deployment context
Fixed-mount on a backplate with front-front connections — typical for distribution panels where the breaker bolts to a bus or sub-feed. The 45 mm connection pitch matches standard busbar spacing for 4-pole MCCBs in this frame.
The EasyPact EZC400H series is Schneider's standard-distribution MCCB line, so it's widely stocked through distribution.