12kV Vacuum Circuit Breaker

1. General TZN1-12 series of indoor MV vacuum circuit breakers are used in the indoor switchgear rated 12 kV, 50(60)Hz. They are suitable for making different types of loads and frequent operation, to protect and control the electric equipments in industrial & mining enterprises, power plants and substations.The main electric conduction loop of the circuit breaker (TZN1-12 series) is casted with epoxy resin by APG technics, embedding its vacuum arc extinguish chamber and main loop as an integration. Thereby, its insulation performs with high strength, the size is small, and the surface of its vacuum arc extinguishing chamber avoids the influence of ambient environment, realizing the maintenance-free purpose.Main features:· small size,· water-condensation proof,· high insulation,· pollution-proof,· low resistance,· free maintenance.2. Normal Service Condition· Ambient temperature: -15 +40· Altitude: ≤1000m· Relative humidity: daily average relative humidity ≤ 95%; monthly average relative humidity ≤ 90%· Free from fire, explosion, heavy pollution, chemical corrosion and severe vibration.· Earthquake intensity ≤ 8 degreeIf the service condition differs from the above , the user should consult it with manufacturer.3. Technical ParametersNo.ItemUnitParameter1 Rated voltage kV122 Rated frequency Hz50603 Rated short-time power frequency withstand voltage(1 min)kV424 Rated lightning impulse withstand voltagekV755 Rated current A63012506301250125016002000125016002000250031506 Rated short-time withstand currentkA202531.5407 Rated peak withstand currentkA5063801008 Rated short-circuit breaking currentkA202531.5409 Rated short-circuit making currentkA50638010010 Rated operating sequence/O-0.3s-CO-180s-COO-180s-CO-180s-CO40kA11 Short-circuit current breaking timestimes27412 Rated capacitor bank breaking currentA630/40013 Mechanical endurancetimes10000