Technical Parameters Parameter Specification / Value Standard Compliance IEC/EN 61643-11, IEC 61643-31, IEEE C62.41 Protection Classification Type 1 + Type 2 Combined (Class I + II) System Configuration 690 V AC, 3P+N (TN-S, TT, IT systems) Rated Voltage (Un) 690 V AC (±10%) Maximum Continuous Voltage (Uc) 440 V AC (L-N) / 550 V AC (L-L) Lightning Impulse Current (Iimp) 10/350 µs 25 kA (per mode) Nominal Discharge Current (In) 8/20 µs 47.0 kA (per mode) Maximum Discharge Current (Imax) 8/20 µs 100 kA (per mode) Voltage Protection Level (Up) @ In ≤ 3.5 kV (Line-Neutral) Response Time < 100 ns Short-Circuit Withstand 50 kA RMS (per IEC 61643-11) Recommended Backup Protection 315A gL/gG fuse or equivalent circuit breaker (consult installation manual) Connection Terminals Line/Neutral: 70-185 mm² Earth/PE: 95-185 mm² (copper) Insulation Coordination Enhanced for 690V systems (clearance: ≥8.0mm, creepage: ≥16.0mm) Auxiliary Contacts Optional remote signaling contact (2 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 Altitude Rating Up to 4000 m without derating Status Indication Visual window with color flag (green=OK, red=fault) + optional remote signaling Mounting DIN-rail mountable (45 mm) or direct panel mounting with seismic brackets Dimensions (H×W×D) ~ 400 × 120 × 90 mm (confirm with official datasheet) Weight Approximately 5.2 kg Model Interpretation PSTB: Product series 470: Discharge capacity (47.0 kA In) 690: Voltage rating (690V system) 70: Configuration code