Key Specifications General Manufacturer: ABB Model / Part Number: S203‑C1 Product Type: 3‑pole miniature circuit breaker (MCB) Series: S200 series Trip Curve: C‑characteristic (general purpose) Poles: 3 poles (3P) Rated Current (In): 1 A (per pole) Modular Width: 3 modules (3 × 18 mm) Electrical Ratings Rated Operational Voltage (AC): 230/400 V AC (three‑phase system) Rated Insulation Voltage (Ui): ~440 V Rated Frequency: 50–60 Hz Thermal‑Magnetic Protection: Combined thermal overload and magnetic short‑circuit trip Breaking / Interrupting Capacity: Icu (ultimate): up to ~25 kA (IEC) at 230/400 V AC Ics (service): ~7.5–12.5 kA depending on test standards Current Limiting Class: 3 (limits let‑through energy during short bursts) Mechanical & Installation Mounting: DIN rail (TH35) mountable in distribution panels Terminal Type: Screw terminals suitable for solid and ferruled conductors Actuator/Handle: Black, sealable with ON/OFF indication Mechanical Endurance: ~20,000 cycles Electrical Endurance: ~20,000 AC cycles Operating Temperature: Approx. −25 °C to +55 °C Protection & Compliance Standards: IEC/EN 60898‑1, IEC/EN 60947‑2 (MCB isolation/protection standards) UL/CSA: Compliant versions applicable to regional markets