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PSTB250-600-70

The ABB PSTB250-600-70 is a Type 1+2 Combined Surge Protective Device (SPD) from ABB's PSTB series, designed for 400V AC three-phase power systems. This device provides enhanced primary surge protection at main distribution boards and service entrances, offering superior surge current handling capacity for applications requiring robust protection against direct lightning strikes and severe switching surges.

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Technical Parameters Parameter Specification / Value Standard Compliance IEC/EN 61643-11 Protection Classification Type 1 + Type 2 Combined (Class I + II) System Configuration 400 V AC, 3P+N (TN-S, TT, TN-C-S systems) Rated Voltage (Un) 400 V AC (±10%) Maximum Continuous Voltage (Uc) 255 V AC (L-N) / 320 V AC (L-L) Lightning Impulse Current (Iimp) 10/350 µs 25 kA (per mode) Nominal Discharge Current (In) 8/20 µs 25.0 kA (per mode) Maximum Discharge Current (Imax) 8/20 µs 60 kA (per mode) Voltage Protection Level (Up) @ In ≤ 2.3 kV (Line-Neutral) Response Time < 100 ns Short-Circuit Withstand According to IEC 61643-11 (typically 35 kA) Recommended Backup Protection 160A gL/gG fuse or equivalent circuit breaker (verify with installation manual) Connection Terminals Line/Neutral: 25-95 mm² Earth/PE: 35-95 mm² (copper) Auxiliary Contacts Optional remote signaling contact available Housing Protection IP20 (for indoor enclosure mounting) Operating Temperature -40°C to +80°C Storage Temperature -40°C to +85°C Status Indication Visual window with color flag (green=OK, red=fault) Mounting DIN-rail mountable (35 mm) Dimensions (H×W×D) ~ 288 × 90 × 75 mm (confirm with official datasheet) Weight Approximately 3.2 kg Model Interpretation PSTB: Product series 250: Discharge capacity (25.0 kA In) 600: Iimp = 25 kA 70: Configuration variant