Key Technical Parameters General & Electrical Ratings Product / Model: ABB S204M‑C40DC 4‑Pole Miniature Circuit Breaker Rated Current (In): 40 A (nominal) Number of Poles: 4 (three phases + neutral) Tripping Characteristic: Type C (moderate inrush tolerance) Mounting Type: DIN‑rail panel mount Voltage & Frequency Rated Operational Voltage (AC): up to 440 V AC Rated Operational Voltage (DC): up to 125 V DC (maximum range) Operational Minimum Voltage: ~12 V AC/DC or higher Rated Frequency: 50 Hz / 60 Hz in AC systems Rated Insulation Voltage (Ui): 440 V Rated Impulse Withstand Voltage (Uimp): ~4 kV Switching & Breaking Capacities Rated Short‑Circuit Breaking Capacity (Icn): ~10 kA AC Rated Ultimate Short‑Circuit Breaking Capacity (Icu): • ~25 kA at 230 V AC • ~15 kA at 400–440 V AC Rated Service Short‑Circuit Breaking Capacity (Ics): ~7.5 kA at 230 V AC Energy Limiting Class: Class 3 Overvoltage Category: III Mechanical & Performance Power Loss: ~19.2 W (total) at rated conditions Terminal Type: Screw terminals (failsafe bi‑directional) Tightening Torque: ~2.8 N·m for terminals Actuator: Toggle handle with ON/OFF marking Mechanical Endurance: ~20,000 cycles Electrical Endurance: ~10,000 AC cycles Contact Position Indication: Red (ON) / Green (OFF) Ambient Operating Temperature: ~‑25 °C to +55 °C Storage Temperature: ~‑40 °C to +70 °C Connection Capacity Connectable Wire Ranges: • Solid: ~0.75 – 35 mm² • Stranded: ~0.75 – 35 mm² • Flexible (with ferrule): ~0.75 – 25 mm² Physical & Installation Width: 4 modular units (fits standard DIN‑rail panels) Dimensions (approx): Width ~70 mm × Height ~88 mm × Depth ~69 mm Degree of Protection: IP20 (terminals / housing) Pollution Degree: 3 Standards & Compliance Standards: IEC/EN 60898‑1, IEC/EN 60947‑2 (miniature circuit breaker standards) Applications DC and AC circuit protection where overload and short‑circuit protection is needed Branch circuit protection in commercial and industrial panels Protection of intermediate circuits in equipment or control systems powered from DC supplies Suitable for systems with moderate inrush currents (lighting, small motors, control loads)