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IST 3P+N40

The Schneider Electric Acti 9 iST 3P+N 40kA is a Type 2 (Class II) Surge Protective Device from the iST series. Its 3P+N configuration provides comprehensive protection for all live conductors in three-phase electrical systems.

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Specifications Parameter Specification Product Series Acti 9 iST Model iST 3P+N 40 (40 indicates Iₙ = 40kA) Type / Class Type 2 (Class II) – For main or sub-distribution level protection. Configuration 3P+N – Protects the three phases (L1, L2, L3) and the Neutral against Earth. Nominal Discharge Current (Iₙ) 40 kA (8/20 µs wave, per mode) Max. Discharge Current (Iₘₐₓ) 80 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, TN-C-S, TT systems. Response Time < 25 ns Backup Protection Requires an external fuse or circuit breaker (typically 63A gG/gL type or higher, as per instructions). Status Indication Visual indicator: Green (OK) / Red (Fault/End of Life). Remote Signaling Optional remote alarm contact (often available as an accessory). 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