Key Specifications General Manufacturer: ABB Model / Part Number: GDA203 AC‑63/0.03 / 2TAZ812301R2630 Product Type: Residual Current Device (RCD) / Earth‑Leakage Protection Module Series: GDA200 series Poles: 3 poles (for three‑phase systems) Electrical Ratings Rated Current (In): 63 A (maximum load current carried while providing protection) Rated Residual Operating Current (IΔn): 0.03 A (30 mA) — trips when leakage ≥30 mA Type of Residual Current Detection: AC type (detects sinusoidal AC earth leakage currents) Rated Operational Voltage (Ue): ~230/400 V AC (three‑phase) Rated Insulation Voltage (Ui): ~500 V Rated Impulse Withstand Voltage (Uimp): ~4 kV Rated Frequency: 50 – 60 Hz Performance & Safety Protection Function: Detects imbalance between live conductors and trips to disconnect supply under earth‑fault conditions Safety Target: Protects against electric shock and fire risk caused by earth leakage Suitable Applications: Residential, commercial and industrial electrical distribution boards Mechanical & Environmental Number of Poles: 3 (for 3‑phase systems) Mounting: DIN‑rail mountable (standard distribution panel assembly) Operating Ambient Temperature Range: typically −25 °C to +55 °C Degree of Protection: typical IP ratings for distribution module blocks Electrical Endurance: Typical high‑cycle durability for distribution devices