Molded case circuit breaker for distribution panels
The Schneider Electric EZC400H44300 is a 4-pole molded case circuit breaker from the EasyPact EZC400H series, rated 400 A at 40 °C with a TM-D thermal-magnetic trip unit. The breaker is fixed-mounted to a backplate, front-connected both top and bottom, and carries IP20 finger-safe protection on the enclosure.
The H breaking capacity code (50 kA Icu at 400-415 V AC) positions this breaker for high-fault installations where downstream devices need a robust upstream limiter. At 220-240 V AC the Icu rises to 70 kA. The magnetic trip is fixed at 3200 A (8× In), so the instantaneous response is predictable for selective coordination studies.
Integration into a distribution panel
The 140 mm width and 255 mm height fit standard distribution panel cutouts; the 44 mm pole pitch matches busbar spacing for 4-pole systems. IK07 impact rating covers accidental tool strikes during installation.
Protection and isolation capability
The TM-D trip unit provides both short-circuit and overload protection with a fixed magnetic threshold of 3200 A. No integral earth-leakage or neutral protection; those functions require external modules or a separate RCD.
Durability and standards compliance
Rated for 4000 electrical cycles at 415 V AC (Category A) and 10000 mechanical cycles — sufficient for a distribution breaker that operates infrequently. Complies with EN/IEC 60947-1, EN/IEC 60947-2, JIS C8201-2-2, and GB/T 14048.2, covering European, Japanese, and Chinese installation standards.