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PSTB300-600-70

The ABB PSTB300-600-70 is a Type 1+2 Combined Surge Protective Device (SPD) from ABB's PSTB series, engineered for 400V AC three-phase power systems. This device represents the high-capacity tier of primary surge protection at main distribution boards and service entrances, delivering superior surge current handling capability for applications requiring maximum 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 30.0 kA (per mode) Maximum Discharge Current (Imax) 8/20 µs 70 kA (per mode) Voltage Protection Level (Up) @ In ≤ 2.4 kV (Line-Neutral) Response Time < 100 ns Short-Circuit Withstand According to IEC 61643-11 (typically 40 kA) Recommended Backup Protection 200A gL/gG fuse or equivalent circuit breaker (verify with installation manual) Connection Terminals Line/Neutral: 35-120 mm² Earth/PE: 50-120 mm² (copper) Auxiliary Contacts Optional remote signaling contact (1 NO/NC changeover) 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) + optional remote signaling Mounting DIN-rail mountable (35 mm) or direct panel mounting Dimensions (H×W×D) ~ 360 × 110 × 85 mm (confirm with official datasheet) Weight Approximately 3.8 kg Model Interpretation PSTB: Product series 300: Discharge capacity (30.0 kA In) 600: Iimp = 25 kA 70: Configuration variant