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Vacuum Circuit Breaker(VCB)12KV 24KV 36KV BKZF-12 Drawout vacuum LBS

BKZF(R)-12 Drawout type vacuum load break switch with fuse 400A 630A

vacuum AC contactors utilize vacuum bottle encapsulated contacts to suppress the arc. This arc suppression allows the contacts to be much smaller and use less space than air break contacts at higher currents. As the contacts are encapsulated, vacuum contactors are used fairly extensively in dirty applications, such as mining.

    BKZF(R)-12 Drawout type vacuum load break switch

    BKZF(R)-12 Medium Voltage Drawout type

    Type: AC contactor

    Specifications:

    Vacuum bottle encapsulated contacts are used in vacuum AC contactors to minimize arcing. Compared to air break contacts at higher currents, this arc suppression enables the contacts to be significantly smaller and take up less space. Vacuum contactors are fairly common in filthy applications like mining since the contacts are enclosed.

    Only AC systems are suitable for using vacuum contactors. When the current waveform crosses zero, the AC arc that was created when the contacts opened will self-extinguish because the vacuum will stop the arc from striking the open contacts again. As the maximum break time is dictated by the periodicity of the AC waveform, vacuum contactors are consequently particularly effective at breaking the energy of an electric arc and are utilized when reasonably fast switching is required.

    Suitable for use with metal-clad drawout type switchgear assemblies KYN28-12 medium voltage.

     

    Main technical parameters:

    NO.

    Parameters

    Unit

    Value

    BKZC(R)-12-630/400/250

    BKZC(R)-12-630/400/250

    1

    Rated Voltage

    kV

    7.2

    12

    2

    Rated Current

    A

    630

    400

    250

    630

    400

    250

    3

    Rated closing current (rms)

    A

    6300

    4000

    2500

    6300

    4000

    2500

    4

    rated breaking current

    5040

    3200

    2500

    5040

    3200

    2500

    5

    4S thermal current

    6300

    4000

    2500

    6300

    4000

    2500

    6

    Limit breaking current

    6300

    4000

    2500

    6300

    4000

    2500

    7

    Power frequency withstand voltage

    kV

    32

    42

    8

    operating frequency

    Times/h

    300

    9

    Electric life time

    AC-3

    ×10Times

    25

    AC-4

    10

    10

    Mechanical life

    30

    11

    Rated operating voltage

    V

    AC110/220

    12

    Closing coil pull current

    A

    ≤ DC6/3

    13

    Holding coil holding current

    D:DC0.32/0.16

    14

    Shunt trip coil current

    J:DC2.5/1.3

     

    NO.

    Parameters

    Unit

    Value

    BKZC(R)-12-630/400/250

    BKZC(R)-12-630/400/250

    1

    contact distance

    mm

    4.5+1.0/-0.5

    6+1.0-0.5

    2

    contact overtravel

    1.5±0.5

    3

    Average closing speed

    m/s

    0.1~0.25

    4

    Average opening speed

    0.3~0.6