Key Technical Parameters (English) General & Protection Product / Model: ABB XT3N250 TMD250/2500 FF 4P Device Type: Molded Case Circuit Breaker (MCCB) Series: SACE Tmax XT Number of Poles: 4 (three phases + neutral) Trip Unit Type: Thermal‑Magnetic (TMD) Mounting Style: Fixed with front terminals Current & Voltage Ratings Rated Continuous Current (In): 250 A Overload Trip Setting Range: Adjustable (typically a range ending at 250 A) Instantaneous Short‑Circuit Setting: 2500 A Rated Operational Voltage: Up to 690 V AC and 500 V DC Rated Frequency: 50 Hz / 60 Hz Rated Insulation Voltage (Ui): 800 V Rated Impulse Withstand Voltage (Uimp): 8 kV Breaking Capacities Rated Ultimate Short‑Circuit Breaking Capacity (Icu) – AC: ~50 kA at 220–240 V AC ~36 kA at 380–415 V AC ~25 kA at 440–500 V AC ~5 kA at 690 V AC Rated Service Short‑Circuit Breaking Capacity (Ics) – AC: ~50 kA at 220–240 V AC ~36 kA at 380–415 V AC Lower values at higher voltages (e.g., ~18 kA at 440 V AC, ~3.75 kA at 690 V AC) DC Breaking Capability: ~36 kA at 250 V DC (2 poles in series) ~50 kA at 500 V DC (3 poles in series) Performance & Durability Electrical Durability: ~8,000 operating cycles Mechanical Durability: ~25,000 cycles Power Loss per Pole at Rated Conditions: ~17.8 W Terminal Connection: Bolt / front terminals with recommended tightening torque Physical & Environmental Dimensions: Approx. 140 mm × 150 mm × 70 mm (height × width × depth) Weight: ~2 kg Degree of Protection: Standard industrial MCCB housing (typically IP20 on terminals) Operating Environment: Suitable for industrial distribution panels and switchboards Applications Protection of three‑phase power distribution circuits Motor feeder and branch circuit protection