Specifications General Product Type: Molded Case Circuit Breaker (MCCB) Series / Family: EZD400E Model: EZD400E 4P 320A Number of Poles: 4 (three phases + neutral) Rated Current (In): 320 A Mounting Type: Fixed panel or distribution board installation Application: Overload, short‑circuit, and fault protection for low‑voltage four‑wire circuits Electrical Ratings Rated Operational Voltage (Ue): 400 V AC (commonly used for three‑phase + neutral) Rated Frequency: 50/60 Hz Rated Insulation Voltage (Ui): 690 V AC Rated Impulse Withstand Voltage (Uimp): 8 kV Short‑Circuit Withstand Capacity (Icu): Typical values up to 50 kA depending on configuration Rated Service Short‑Circuit Rating (Ics): Up to 25 kA or more depending on variant Protection & Trip Characteristics Trip Unit Type: Thermal‑magnetic (standard) Overload Protection: Thermal element responds to prolonged overload currents Short‑Circuit Protection: Magnetic element provides instantaneous trip for high fault currents Tripping Behavior: Combined thermal and magnetic action for dependable protection under abnormal current conditions Mechanical & Environmental Terminal Connections: Screw or clamp type terminals for secure conductor attachment Mechanical Durability: Designed for repeated switching and fault interruption cycles Design: Modular, compact housing for integration into panels and switchboards Installation Environment: Indoor electrical distribution boards and switchgear Operating Temperature Range: Typical ambient electrical installation range Functional Features Four‑pole protection for comprehensive coverage of three phases and neutral High breaking capacity suitable for industrial and commercial power systems Thermal‑magnetic trip for combined overload and short‑circuit protection Modular design enables easy installation and integration