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PSTX1250-600-70

The ABB PSTX1250-600-70 is a High-Capacity Type 1+2 Combined Surge Protective Device (SPD) from ABB's premium PSTX series. It is engineered as a heavy-duty, three-phase+neutral (3P+N) surge arrester for installation at the main service entrance of large commercial, industrial, and critical infrastructure power systems.

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Technical Parameters Parameter Specification / Value Application Standard IEC/EN 61643-11 Protection Type / Class Type 1 + Type 2 Combined (Class I + II) Rated System Voltage 400 V AC, 3P+N (50/60 Hz) Maximum Continuous Operating Voltage (Uc) 440 V AC (Line-Neutral) / 520 V AC (Line-Line) Impulse Discharge Current (Iimp) 10/350 µs 60 kA (per pole, L/N) Nominal Discharge Current (In) 8/20 µs 125 kA (per pole) Maximum Discharge Current (Imax) 8/20 µs 200 kA (per pole) Voltage Protection Level (Up) @ In ≤ 2.8 kV (Line-Neutral) Response Time < 100 ns Short-Circuit Withstand Rating (SCCR) Very High - According to IEC 61643-11, typically requires 250-400A upstream protection (consult datasheet) Back-up Fuse/Circuit Breaker Mandatory. Typically 250A-400A gL/gG or equivalent circuit breaker (Must use ABB-specified ratings from installation manual). Connection Cross-Section Line & Neutral: 50 - 185 mm² (copper) Earth/PE: 70 - 185 mm² (copper) Remote Signaling Optional auxiliary contact (changeover) for remote monitoring of status. Housing Material High-strength thermoplastic or thermoset (UL94 V-0) Protection Degree (IP) IP20 (for enclosure mounting) Operating Temperature Range -40 °C to +80 °C Status Indication Visual (color flag) + Optional remote contact Mounting Robust DIN-rail or direct panel mounting Dimensions (H×W×D) Approx. >350 mm × 110 mm × 90 mm (Large format - confirm with official datasheet) Model Decode PSTX: Premium High-Capacity Series 1250: In = 125 kA (8/20µs) 600: Iimp = 60 kA (10/350µs) 70: Version/Configuration Code