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        Product List
        ZW27B-12 Type Outdoor HV AC Vacuum Circuit Breaker
        ZW27B-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 minding 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. It can be also used as a sectionalizing switch after equipped with a disconnect switch, thus the installation space and working hours can be saved more. 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: ≤1500m;
        2. Ambient temperature: -40℃~+45℃;diurnal temperature rang ≤25℃;
        3. Wind speed: ≤34m/s (wind pressure ≤700Pa);
        4. Earthquake intensity: ≤grade 8;
        5. Relative humidity: monthly average ≤90%; daily average ≤95%. Dew may be condensed in the interior of the tank body when high humidity drop rapidly;
        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;
        9. Neutral grounding mode: neutral non grounding, neutral grounding via arc-extinguishing coil, neutral grounding via low-resistance.

        Technical specification
        No. Item Unit Data
        1 Rated voltage kV 12
        2 Rated current A 630
        3 Rated insulation level 1min P.F
        withstand voltage
        Dry test kV 42
        Wet test (to earth, external insulation) 34
        Lightning impulse withstand voltage(peak) 75
        4 Rated frequency Hz 50/60
        5 Rated short-circuit breaking current kA 20
        6 Rated operating sequence O-0.3s-CO-180s-CO
        7 Breaking times of rated short-circuit breaking current times 30
        8 Rated short-circuit making current(peak) kA 50
        9 Rated peak withstand current 50
        10 Rated short-time withstand current 20
        11 Rated short-circuit duration s 4
        12 Rated operating voltage /rated auxiliary loop voltage V AC/DC 220
        13 Average opening speed m/s 1.0±0.3
        14 Average closing speed 1.0±0.25
        15 Contact close-bouncing time ms ≤2
        16 Three-phase opening/closing non-simultaneity ≤2
        17 Closing time ms 25~50
        18 Opening time At highest rated operating voltage 15~50
        At lowest rated operating voltage 30~16
        19 DC resistance for each phase loop μΩ ≤120(200 with isolator)
        20 Phase-to-phase spacing(measure from arc chamber’s end) mm 260±2.0
        21 Mechanical life times 10000
        22 Net weight kg 135(155 with isolator)

        Main function features
        1. The product can be equipped integratedly with a built-in voltage transformer to simplify the construction and installation;
        2. The switch can be equipped with an external isolator according to the users’ request. The structure can be compact.
        3. The operating mechanism may be equipped with an anti-trip device and counter which is convenient for the users to accurately know the operating life of the product;
        4. Iron or stainless steel body, manual or electric mechanism is available for free chioce;
        5. The product can be equipped with metering tank to realize electricity consumption monitoring.
        6. The operating mechanism can be permanent magnet type arrcording to the users’ request;
        7. The switch can be equipped with a built-in zero sequence CT, the reserved automation interface is convenient for the users to upgrade the line.
        Outline and installation dimension