Specifications Parameter Specification Product Series Acti 9 iPRU Model Designation iPRU 4P 20R Type / Class Type 2 (Class II) – For installation at the origin (main distribution board) or sub-distribution level. Configuration 4P – Protects all 3 phases (L1, L2, L3) and the Neutral. Connection scheme is typically 3+1 mode (L-N & N-PE) or 4-mode common mode. Nominal Discharge Current (In) 20 kA (8/20 µs wave, per mode) Max. Discharge Current (Imax) 40 kA (8/20 µs wave, per mode) Voltage Protection Level (Up) ≤ 1.5 kV (at In, typical for 230/400V systems) Rated Voltage (Uc) 275V AC (L-N) / 440V AC (L-L) for 230/400V TN-S/TN-C-S/TT systems. Key Feature Integrated Thermal Disconnector ("R" version): • NO external backup fuse required for standard installations (simplifies design and saves space). • Automatically disconnects the SPD from the circuit in case of internal thermal overload due to end-of-life or sustained overvoltage, preventing fire risk. Status Indication 3-color LED indicator: • Green: Functional • Orange: Warning/End of Life approaching • Red: Faulty/Disconnected Remote Signaling Built-in changeover contact (NO/NC) for remote alarm (e.g., connection to a BMS or alarm panel). Mounting DIN Rail (35 mm) Width 72 mm (4-module width) Standards IEC/EN 61643-11 Operating Temperature -40°C to +80°C