Key Technical Parameters General & Protection Ratings Product / Model: ABB T5H 400 TMA 400‑4000 3P MCCB Part Number: 1SDA054445R1 Device Type: Molded Case Circuit Breaker (MCCB) Series: Tmax T5H Number of Poles: 3 (three‑pole) Mounting Style: Fixed with front terminals Trip Unit Type: Thermal‑Magnetic (TMA) Current & Voltage Ratings Rated Uninterrupted (Continuous) Current (In): 400 A Overload Trip Setting Range: Adjustable around 280–400 A Instantaneous Short‑Circuit Setting Range: ~2000 A to 4000 A Rated Operational Voltage (AC): Up to 690 V AC Rated Operational Voltage (DC): Up to 750 V DC Rated Frequency: 50 Hz / 60 Hz Rated Insulation Voltage (Ui): 1000 V Rated Impulse Withstand Voltage (Uimp): 8 kV Breaking Capacities Rated Ultimate Short‑Circuit Breaking Capacity (Icu): ~100 kA at 220–230 V AC ~70 kA at 380–440 V AC ~50 kA at 500 V AC ~40 kA at 690 V AC Rated Service Short‑Circuit Breaking Capacity (Ics): Matches Icu values at respective voltages (e.g., 100 kA at 220–230 V AC, 70 kA at 380–440 V AC) Durability & Performance Electrical Durability: ~7,000 operating cycles (at 60 cycles/hour) Mechanical Durability: ~20,000 cycles (at 120 cycles/hour) Per‑Pole Power Loss at Rated Conditions: ~19.5 W Mechanical & Physical Terminal Type: Fixed front terminals Dimensions: ~140 mm width × ~205 mm height × ~104 mm depth Weight: ~4.8 kg Protection Degree: Standard industrial MCCB housing suitable for enclosure use Typical Applications Protection of three‑phase distribution circuits in industrial and commercial installations Feeder and motor circuit protection in switchboards Overload and short‑circuit safeguarding in electrical distribution systems