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 (50/60 Hz) Maximum Continuous Voltage (Uc) 420 V AC (L-N) / 730 V AC (L-L) Lightning Impulse Current (Iimp) 10/350 µs 25 kA (per mode) Nominal Discharge Current (In) 8/20 µs 37 kA (per mode) Maximum Discharge Current (Imax) 8/20 µs 70 kA (per mode) Voltage Protection Level (Up) @ In ≤ 2.8 kV (Line-Neutral) Response Time < 25 ns (varistor stage) Short-Circuit Withstand 25 kA RMS (typical) Recommended Backup Protection 160A gL/gG fuse or equivalent circuit breaker (verify with installation manual) Connection Capacity Line/Neutral: 25-95 mm² Earth/PE: 35-95 mm² Auxiliary Contacts 1 NO + 1 NC changeover contact (for remote monitoring) Housing Protection IP20 (requires enclosure installation) Operating Temperature -40°C to +80°C Status Indication Visual window (green/red) + remote signaling capability Mounting DIN-rail (35 mm) or direct panel mount Dimensions (H×W×D) ~ 288 × 90 × 75 mm (confirm with datasheet) Model Interpretation PSTX: Series 370: Platform code (420V Uc) 690: Voltage class 70: Discharge current code (37 kA In)