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ZW12-12 Vacuum Circuit Breakers

ZW12-12 is mainly used for distribution systems in country or city network, mines, railway and ports with 12kv level,  rated frequency 50hz, especially for outdoor overhead line, it switches on/off load current and over load or short current to switch and protect electric networks, matching with a disconnecting switch, the breaker can be a combined switch, the disconnecting switch is installed on the side of the breaker body, combining with the breaker by the angle iron under frame.

The breaker becomes a recloser  intelligence breaker, matching with a reclosing controller and PT ,the breaker has three segment compound protection of switch on rush current control, over current protection and short quick break, and it has 1~3times of reclosing ,low current ground protection, wired supervisory control functions ,it can also remote control under the pole, and regulate parameters of the breaker ,it is an ideal choice for spot switch and simple measurement switch outside country network substations . 

Normal working environment:

  1. ambient temperature:+40℃~-40℃;
  2. altitude:≤2000M,it should be custom-made for >2000M
  3. wind pressure: ≤ 700PA(equivalent to wind speed 34m/s)
  4. relative humidity: day value ≤95%,month value≤90% 
  5. pollution class: Ⅳ
  6. surrounding air id not polluted by corrosive gas or inflammable gas seriously;
  7. no frequent excessive vibration.

Technical parameters

NAME

UNIT

PARAMETERS

rated voltage

KV

12

rated current

A

630/1250

power frequency withstand voltage

KV

42/48

lightning impulse withstand voltage(peak value)

KV

75/85

rated short circuit breaking current

KA

12.5 16 20 / 20 25 31.5

rated short current switching current (peak value)

KA

31.5 40 50 / 50 63 80

rated short time withstand current

KA

12.5 16 20 / 20 25 31.5

rated peak value withstand current

KA

31.5 40 50 / 50 63 80

breaking current frequency under rated shout circuit

TIMES

30

mechanism life

TIMES

10000

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