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        Product List
        ZW20B-12 Type Outdoor HV AC Vacuum Circuit Breaker
        ZW20B-12 type outdoor HV AC vacuum circuit breaker is used to make and break load current, overload current and short-circuit current in the power system with rated voltage 12kV, three-phase AC 50/60Hz. It is applicable to substations, industrial and mining enterprises, unban and rural electric power networks, especially to the occasions with frequent operation and automatic power distribution networks for power network control and equipment protection. The product conforms to the standards of IEC62271-100 & GB1984: AC high voltage circuit breaker, IEC60694 & GB/T11022: HV general technical requirement of switch and control apparatus.
        Ambient conditions
        1. Altitude: ≤3000m;
        2. Ambient temperature: -30℃~+45℃;diurnal temperature rang ≤25℃;
        3. Wind speed: ≤35m/s;
        4. Earthquake intensity: ≤grade 8;
        5. Relative humidity: monthly average ≤90%; daily average ≤95%;
        6. Ice thickness: ≤10mm
        7. Pollution degree: ≤Ⅳ(GB5582);
        8. Applicable occasions: no fire and explosion danger, no chemical corrosion and no frequent severe vibration.

        Technical specification
        No. Item Unit Data
        1 Rated value Rated voltage kV 12
        Rated frequency Hz 50/60
        Rated current A 630
        Rated withstand current(peak) kA 50
        Rated short-time withstand current(4s) 20
        Rated short-circuit making current(peak) 50
        Breaking times of rated current times 1000
        Making times of rated short-circuit breaking current 30
        2 1min P.F
        withstand voltage
        Phase to phase, phase to earth kV 42
        Across open contacts 49
        P.F withstand voltage for secondary loop 2
        3 Lightning impulse
        withstand voltage(peak)
        Phase to phase, phase to earth 75
        Across open contacts 85
        4 Opening speed m/s 1.2±0.2
        5 Closing speed 0.8±0.2
        6 Closing time ms 20~60
        7 Opening time 18~45
        8 Contact close-bouncing time ms ≤2
        9 Three-phase opening/closing non-simultaneity ≤2
        10 Each phase conductive loop resistance μΩ ≤120
        11 Rated power for energy storage motor W ≯40
        12 Rated voltage for energy storage motor V DC24/DC220
        13 Rated close-operating voltage DC24/DC220
        14 Rated open-operating voltage DC24/DC220
        15 Rated pressure of SF6 gas (gauge pressure) MPa “0”
        16 External creepage distance cm/kV 3.8
        17 External charged air insulation distance mm 240±2
        18 Phase-to-phase spacing 135±1.5
        19 Mechanical life times 10000
        20 Net weight kg 145

        Main function features
        1. Three phases in a common fully sealed body, vacuum arc-extinguishing, N2 gas as external insulation;
        2. Built-in silicon rubber cover can ensure the standard of 42kV withstand voltage under the natural conditions. Filling in N2 gas, insulation margin is more fully;
        3. Simple and convenient for the users to adjust the CT ratio directly by a change-over switch;
        4. Hoisting installation or seat installation is convenient for the switch;
        5. The automation interface can be provided with the swich as long as it’s equipped with aviation plugs.
        6. The switch can realize the function of recloser after equipped with external PT and reclosing controller.
        Outline and installation dimension