Product Details  Professional manufacturer of Vaccum Circuit Breaker Voltage ranging from 12kV, 24kV, 40.5kV Type tested China Famous Brand  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 degree  If the service condition differs from the above , the user should consult it with manufacturer.  3. Technical Parameters No.  Item  Unit  Parameter  1   Rated voltage  kV  12  2   Rated frequency  Hz  5060  3   Rated short-time power frequency withstand voltage(1 min)  kV  42  4   Rated lightning impulse withstand voltage  kV  75  5   Rated current  A  630  1250  630  1250  1250  1600  2000  12501600  20002500  3150  6   Rated short-time withstand current  kA  20  25  31.5  40  7   Rated peak withstand current  kA  50  63  80  100  8   Rated short-circuit breaking current  kA  20  25  31.5  40  9   Rated short-circuit making current  kA  50  63  80  100  10   Rated operating sequence  /  O-0.3s-CO-180s-CO  O-180s-CO-180s-CO40kA  11   Short-circuit current breaking times  times  274  12   Rated capacitor bank breaking current  A  630/400  13   Mechanical endurance  times  10000