Specifications Parameter Specification Product Series Acti 9 iST Model iST 4P 40R Type / Class Type 2 (Class II) – For installation at main distribution or sub-distribution level. Configuration 4 Poles (3P+N) – Protects all three phases (L1, L2, L3) and the Neutral. Nominal Discharge Current (Iₙ) 20 kA (8/20 µs wave, per mode). Note: The "40" in the model likely refers to the Iₘₐₓ value. 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 (U꜀) 275V AC (L-N) / 440V AC (L-L) for 230/400V TN-S/TT systems. Key Feature "R" Integrated Remote Signaling Contact: A built-in changeover contact (NO/NC) that triggers when the SPD reaches a fault or end-of-life state, enabling connection to a Building Management System (BMS), alarm panel, or indicator light. Status Indication Visual indicator: Green (OK) / Red (Fault). Backup Protection Requires an external fuse or circuit breaker (typically 32A-63A gG/gL type as per instructions). Response Time < 25 ns Mounting DIN Rail (35 mm) Width 72 mm (4-module width) Standards IEC/EN 61643-11, CE, RoHS Operating Temperature -40°C to +80°C