Specifications (English) General Product Type: Surge Protective Device (SPD) Model/Series: iST 4P Number of Poles: 4 (three phases + neutral) Surge Protection Class: Type 2 (distribution surge protection) Electrical Ratings Nominal Discharge Current (In): Designed for 20 kA (8/20 µs) surge impulses per phase Maximum Discharge Current (Imax): Rated up to 20 kA for transient surge events Rated Operating Voltage (Ue): Suitable for low‑voltage three‑phase systems (typically 230/400 V AC) Maximum Continuous Operating Voltage (Uc): Designed to operate continuously at the specified system voltage level Protection Technology: Metal‑Oxide Varistors (MOVs) for fast energy absorption and clamping of transient overvoltages Voltage Protection Level: Provides a low clamping voltage to limit surges to safe levels Protection & Performance Surge Modes Covered: Line‑to‑Neutral (L‑N) Line‑to‑Earth (L‑PE) Neutral‑to‑Earth (N‑PE) Response Time: Fast response to overvoltage transients Fault Indication: Visual indicators to show SPD operational status Replaceable/Modular: Designed for easy replacement if protection elements wear Mechanical & Mounting Mounting Type: DIN‑rail (35 mm) compatible for distribution board installation Terminal Connections: Screw/terminal blocks for secure conductor connection Housing: Compact modular enclosure suitable for indoor panel mounting Operating Environment: Designed for standard electrical distribution environments Installation: Installed at service entrance or distribution board to protect downstream circuits