ZN85-40.5 High Voltage Vacuum Circuit Breaker

ZN85-40.5 indoor AC high-voltage vacuum circuit breaker is suitable for AC 50Hz. 35kV power system, used as a protection and control device in power plants, substations, etc.

Product Profile


ZN85 indoor high-voltage alternating-current vacuum circuit breaker has a frequency of 50Hz and a rated voltage of 40.5kV.It applies to theelectrical equipment control and protection in industrial and mining enterprises,power plants and substations,particularly to the places needingfrequent operation.It can be fixed in a switch cabinet or installed on a handcart.

With stable performance and convenient installation,it is the best choice for the control and protection of high-voltage power transmission

and distribution systems.

◆Product standards

ZN85 indoor high-voltage alternating-current vacuum circuit breaker is produced in line with the following standards and codes.

● IEC 62271-100 High-voltage alternating-current circuit-breakers

● GB/T 11022-2011 Common specifications for high-voltage switchgear and controlgear standards

●GB 1984 High-voltage alternating-current circuit-breakers

●GB 311.1 Insulation co-ordination for high voltage transmission and distribution equipment

◆Operating conditions

Normal operating conditions

● Ambient temperature:-40℃~+40℃(below 35℃ within 24 hours)

● Relative humidity:≤95%(daily average)or ≤90%(monthly average)

● Altitude:≤1000m

 ◆Technical parameters

1.1 Technical parameters

Item                                                                                   UnitReference value
    Rated yoltagkV40.5
Lightning impulse withstand voltagekV185
    Rated insulation level            1min power-frequency withstand voltagekV95
    Rated frequeng,Hz50/60
    Rated currentA630/1250/1600/2000/2500/3150
    Rated short-circuit breaking currentkA20/25/31.5
    Rated short-circuic making current (peak valuekA506,380 
    Rated short-time withstand currentkA20/25/31.5
    Rated withstand current (peak valuekA506,380 
    Required operation sequence0-0.3s-CO-180s-CO
    Rated short-circuit duratio54
    Times of making-breaking with the rated short-circuit currenTime30
    Mechanical lifeM2 level

1.2 Mechanical parameters

  ltemUnitReference value
  Gap of contactsmm20±2
   Contact overtravelmm6±1
  Average making speedm/s0.6±0.2
  Average breaking speedm/s1.5~2.0
  Bounce time in contact makingms≤3
  Non-synchronous making/breaking of contactms≤2
  Resistance of the circuit of each phaseμ Q≤80
  Permissible total wear thickness of the moving/fixed contactmm3

◆Overall and Installation dimension

Overall dimension of ZN85-40.5(insulating cylinder handcart)indoor high-voltage alternating-current circuit breaker

   Rated current(A)630125016002000    2500
   Rated breaking current(kA)202,531.5 202,531.5 2,531.5 31.5    31.5
   Fixed contact size D(mm)φ35φ49中55φ79    φ109
   Interphase distance(mm)300±1.5
   Handcart travel(mm)610±2


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