Specifications General Product Type: DC Molded Case Circuit Breaker (MCCB) Series / Family: NSX S‑Frame Model: NSX250S DC 3P 250A Number of Poles: 3 (three DC poles) Rated Current (In): 250 A Application: Protection of low‑voltage DC distribution circuits, including renewable energy and backup power systems Mounting: Panelboard or switchboard installation DC Electrical Ratings Rated Operational Voltage (Ue – DC): Designed for DC systems (specific rated voltage per application; typical industrial values up to several hundred volts DC) Rated Frequency: Direct Current (no AC frequency) Rated Insulation Voltage (Ui): Suitable for DC distribution system insulation requirements Rated Impulse Withstand Voltage (Uimp – DC): Engineered to withstand transient voltage stress inherent in DC systems Protection & Trip Characteristics Trip Mechanism: Thermal‑magnetic or electronic trip unit tailored for DC protection Overload Protection: Thermal element responds to sustained overload current Short‑Circuit Protection: Magnetic or electronic element responds to high fault current events Arc Interruption: Designed specifically for DC arc quenching and safe interruption of DC fault conditions Breaking Capacity & Performance High Breaking Capacity: Engineered to safely interrupt DC fault currents that can be more difficult to extinguish compared to AC faults DC Performance: Provides reliable arc control and fault interruption for DC power systems Compliance: Conforms to applicable DC protective device standards and safety requirements for MCCBs Mechanical & Environmental Terminal Connections: Screw or clamp terminal types for secure DC conductor attachment Mechanical Durability: Constructed for repeated switching operations and long service life Design: Modular, compact housing for efficient panel integration Operating Environment: Indoor electrical distribution installations