Technical Parameters Parameter Specification / Value Standard Compliance IEC/EN 61643-11, IEC 61643-31 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) 420 V AC (L-N) / 520 V AC (L-L) Lightning Impulse Current (Iimp) 10/350 µs 25 kA (per mode) Nominal Discharge Current (In) 8/20 µs 39.0 kA (per mode) Maximum Discharge Current (Imax) 8/20 µs 80 kA (per mode) Voltage Protection Level (Up) @ In ≤ 3.2 kV (Line-Neutral) Response Time < 100 ns Short-Circuit Withstand According to IEC 61643-11 (typically 50 kA) Recommended Backup Protection 250A gL/gG fuse or equivalent circuit breaker (consult installation manual) Connection Terminals Line/Neutral: 50-150 mm² Earth/PE: 70-150 mm² (copper) Insulation Coordination Enhanced for 690V systems (clearance: ≥6.0mm, creepage: ≥14.0mm) Auxiliary Contacts Optional remote signaling contact (1 NO/NC changeover) Housing Protection IP20 / NEMA 1 (for indoor enclosure mounting) Operating Temperature -40°C to +85°C Storage Temperature -40°C to +90°C Status Indication Visual window with color flag (green=OK, red=fault) + optional remote signaling Mounting DIN-rail mountable (35/45 mm) or direct panel mounting Dimensions (H×W×D) ~ 360 × 110 × 85 mm (confirm with official datasheet) Weight Approximately 4.2 kg Model Interpretation PSTB: Product series 390: Discharge capacity (39.0 kA In) 690: Voltage rating (690V system) 70: Configuration code