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PSTB840-600-70

The ABB PSTB 840-600-70 is a Type 1 / Class B + Type 2 / Class C Combined Surge Protective Device (SPD). It is a heavy-duty, four-pole SPD specifically designed for installation at the service entrance or main distribution board of three-phase low-voltage AC power systems (TN-S, TN-C-S, TT).

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Parameter Specification / Value Application Standard IEC/EN 61643-11 Protection Type / Class Type 1 + Type 2 Combined (Class B + C) Rated Voltage (Un) 400 V AC, 3P+N (50/60 Hz) Rated Current (In SPD) N/A (SPDs are installed in parallel, not in series with load current) Maximum Continuous Operating Voltage (Uc) 420 V AC (Line-Line & Line-Neutral) Impulse Discharge Current (Iimp) 10/350 µs 50 kA (per pole, L/N) - This is the key Type 1 parameter. Nominal Discharge Current (In) 8/20 µs 60 kA (per pole) Maximum Discharge Current (Imax) 8/20 µs 100 kA (per pole) Voltage Protection Level (Up) at In ≤ 2.5 kV (Line-Neutral) Response Time < 100 ns Short-Circuit Withstand Rating (SCCR) According to IEC 61643-11 Back-up Fuse Recommendation Required. Typically a 125 A gL/gG or 160 A fuse per phase (MUST be verified with local installation guidelines and the latest ABB datasheet). Connection Cross-Section Main Terminals: 25 - 70 mm² (copper) Earth Terminal: 35 - 70 mm² (copper) Housing Material Thermoplastic (UL94 V-0) Protection Degree (IP) IP20 (for indoor installation in appropriate enclosure) Operating Temperature Range -40 °C to +80 °C Status Indication Visual (color flag: green=OK, red=fault) Mounting DIN-rail mountable (35 mm) or direct panel mounting Dimensions (H x W x D) Approx. 288 mm x 90 mm x 75 mm (Please confirm with actual datasheet)