Technical Parameters General Product Type: Miniature Circuit Breaker (MCB) Model: S254S‑D16 Series: System pro M compact S200 series Number of Poles: 4 (four‑pole) Trip Curve: Type D (thermal‑magnetic) Mounting: DIN‑rail (TH35) Actuator: Toggle with ON/OFF indication Electrical Ratings Rated Current (In): 16 A Rated Operational Voltage: up to ~440 V AC for low‑voltage distribution Rated Insulation Voltage (Ui): ~440 V Rated Impulse Withstand Voltage (Uimp): ~4 kV Rated Short‑Circuit Breaking Capacity (Icu): ~20 kA at 230 V AC ~10 kA at 400 V AC Rated Service Short‑Circuit Breaking Capacity (Ics): Portion of Icu typical for S200 series Energy Limiting Class: Class 3 Mechanical & Connection Terminal Type: Screw terminals (finger‑safe) Connectable Conductor Size: Flexible with ferrule: ~0.75 … 25 mm² Rigid conductor: ~0.75 … 35 mm² Tightening Torque: Approx. 2.8 N·m Mechanical Endurance: ~20,000 operations Electrical Endurance: ~20,000 switching cycles Environmental Operating Ambient Temperature: Approx. −25 °C to +55 °C Storage Temperature: Typical industrial storage ambient Pollution Degree: Suitable for industrial environments Protection Rating: Terminals: IP20 Installed with panel cover: higher front protection possible Physical & Dimensions Modular Width: 4 modules (4P) Approx. Dimensions: Standard S200 series footprint Weight: Typical for 4‑pole S200 series breaker Features & Applications Thermal‑magnetic protection against overload and short circuit High inrush tolerance (Type D characteristic) for inductive and motor loads Widely used in distribution boards, switchboards, and pump circuits Suitable for commercial and light industrial electrical systems