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    FZW28-12(VSP5) Type Outdoor HV AC SF Insulation 6 Vacuum Load Break Switch
    FZW28-12(VSP5) type outdoor HV AC SF6 insulation vacuum load break switch is used to open and close load current and short-circuit current in the power distribution system with rated voltage 12kV, three-phase AC 50/60Hz. It is applicable to substations, industrial and mining enterprises, urban and rural electric power networks, especially to the occasions with frequent operation and urban and rural automatic power distribution networks for power network control and equipment protection. The switch has the functions of manual operation and electric operation. The product conforms to the standards of IEC 60265-1, IEC62271-103 & GB/T3804: High voltage AC load break switch.
    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 Data
    Operating method Manual or electric(persistent excitating magnet)
    1 Rated value Rated voltage 12KV
    Rated current 630A
    Rated short-time withstand current(4s) 12.5 16 20
    Rated short-circuit closing current(peak) 31.5 40 50
    Rated frequency 50/60Hz
    2 1min P.F withstand current Operating voltage AC220V(80%~110%)
    Phase to earth 42KV
    Phase to phase 42KV
    Across open contacts 48KV
    Secondary phase to earth 2KV
    3 Lightning impulse
    withstand current(peak)
    Phase to earth 75KV
    Phase to phase 75KV
    Across open contacts 85KV
    4 Rated gauge pressure of SF6 gas

    Concentration up to 93% at 0 gauge pressure
    5 Manual rated operating strength 100~400N
    6 Main loop resistance ≤700μΩ/≤150μΩ
    7 Close-operating 184~220V closing time
    attract current ≤17A
    bouncing time≤10ms
    maintaining current≤
    Lowest closing voltage 120~160V
    8 Open-operating 184~220V opening time≤1.5s
    asynchronous time≤3ms
    Lowest maintaining attact voltage 45~85V
    9 Close/open-operating time difference between isolation clearance and vacuum arc-extinguishing chamber ≥10ms
    10 Power consumption ≤99W
    11 Short-circuit non-breaking test ≥1400A
    12 Air-sealed test(leakage detecting) No leakage at 0.2Mpa
    13 Contact gap of vacuum arc-extingushing chamber 7~9mm
    14 Contact over-travel of vacuum arc-extingushing chamber 3~4mm
    15 Across isolating distance 25~35mm
    16 Isolating clearance over-travel 6~13mm
    17 Net weight 185Kg

    Main function features
    1. SF6 gas insulation: SF6 gas is the non-toxic, non-combustible and electrical insulation gas, it has excellent arc-extinguishing performance;
    2. Besides the standard porcelain bushing, a variety of options are available including silicon rubber insulator on the epoxy equipment bushing;
    3. Visible Open/Close: The main contact position indicator marked by colors (Green-Open; Red-Close) can be easily visible from the ground. The indicator is connected directly to the main contact drive shaft assembly to ensure displaying the contact state accurately;
    4. Reliable sealing performance with IP67 Protection Level: The mature sealing technoloty assures reliable sealing performance. The shell is processed by die drawing once-shaping technology, so it’s easy for the case sealing with high air tightness and high mechanical strength.
    5. Free maintainance: The main loop of circuit breaker, the secondary component and the operation mechanisn are all sealed in SF6 gas(zero gauge pressure), so they are not affected by the external environment, and have stable & reliable performance as well as the advantage of free maintianance.
    6. Good performance of incoming and outgoing line: The switch can adopt cable incoming & outgoing method, or can use liquid silicon rubber corner bushing to make the distance between phases up to 280mm and ensure good performance of external insulation.
    7. Safe usage: Anti-explosive device mounted on the top of box can prevent heated gas or matters from spattering out once the switch fault occurs.
    Outline and installation dimension
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