Technical Parameters Parameter Specification / Value Standard Compliance IEC/EN 61643-11 Protection Classification Type 1 + Type 2 Combined (Class I + II) System Configuration 690 V AC, 3P+N (TN-S, TT systems) Rated Voltage (Un) 690 V AC (±10%) Maximum Continuous Voltage (Uc) 320 V AC (L-N) / 420 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 ≤ 2.9 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 (consult installation manual for exact rating) Connection Terminals Line/Neutral: 25-95 mm² Earth/PE: 35-95 mm² (copper) Insulation Coordination Enhanced for 690V systems (clearance: ≥5.5mm, creepage: ≥12.5mm) 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 3.3 kg Model Interpretation PSTB: Product series 250: Discharge capacity (25.0 kA In) 690: Voltage rating (690V system) 70: Configuration code