... purpose. Main features: · small size, · water-condensation proof,· high insulation,· pollution-proof,· low resistance,· free maintenance. Normal Service Condition · ... 95%; monthly average relative humidity ≤ 90%· Free from fire, explosion, heavy pollution, chemical corrosion and severe vibration.· Earthquake intensity ≤ ... 1250A≤351600-2000A≤25more than 2500A Indoor High Voltage Vacuum Circuit Breaker