ZN63(VS1)-24 Air Vacuum Circuit Breaker

ZN63 (VS1) -24 indoor high-voltage vacuum circuit breaker is an indoor switchgear for three-phase AC 50Hz rated voltage 24kV power systems, serving as a protection and control unit for power grid equipment and industrial and mining enterprise power equipment. Suitable for places that require frequent operation at rated current or multiple interruptions of short-circuit current

Product Profile


ZN63(VS1)indoor high-voltage alternating-current vacuum circuit breaker has a frequency of 50Hz and a rated voltage of 12kV.It applies tothe electrical equipment control and protection in industrial and mining enterprises,power plants and substations,particulanty 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

ZN63(VS1)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

    ItemUnitReference value
    Rated voltagekV24
ightning impulse withstand voltagekV145
    Rated insulation level            1min power-frequency withstand voltagekV65
    Rated frequencyHz50/60
    Rated currentA630/1250/1600/2000/2500/3150
    Rated short-circuit breaking currentkA20/25/31.5
    Rated short-circuic making current (peak value)kA506,380 
    Rated short-time withstand currentkA20/25/31.5/40
    Rated withstand current (peak value)kA506,380 
    Required operation sequence0-0.3s-CO-180s-CO
    Rated short-circuit durationS4
    Times of making-breaking with the rated short-circuit currentTimes30
    Mechanical lifeM2 level

◆Transformer capacity and fuse selection

●The fuse can cut off a large short-circuit current in less than 10 ms and its breaking current can be up to 50KA.Thus,it can protect the transformer most effectively.

● In terms of match between the transformer and the fuse (Table 1),the potential surge current of the fuse must be considered.Thus,fusingcurrent of the fuse must be 1.6 times of the rated value;designer must consider possible fluctuations of other parameters of the grid and reservemargins for them.If a fuse is selected for high-voltage motor protection,designer must consider frequency of start of the high-voltage motorbecause frequent starts of the high-voltage motor will result in the fuse’s failure when timely cooling is not available.

◆Fuse selection

Primary voltage of
the transformer(kV)
Capacity of
the transformer(kVA
Model of the fuseRated current
of the fuse(A)
Model for the domestic marketModel for international market
6.6200XRNT-1012kV BDGHC31.5
40012kV BDGHC63

◆Overall and Installation dimension

Overall dimension of VF(R)-12(wheeled)indoor high-voltage alternating-current vacuum circuit breaker

Cabinet width(mm)P(mm)A(mm)B(mm)C(mm)E(mm)φW(mm)

◆Actuator of VS1-24

The actuator employs spring energy storage which can be done electricallyor manually.When the circuit breaker is operating,the energy generated by theenergy stor

age spring is transferred to the connecting rod mechanism throughan output cam and then to the movable contact through the connecting rodmechanism.The advanced and appropriate buffer avoids bounces in breakingand reduces the impact and vibration in breaking.The actuator almost needsno maintenance or adjustment.It can operate for up to 10,000 times.

◆Overall and Installation dimension

Overall dimension of VS1-24(wheeled)embedded indoor high-voltage alternating-current vacuum circuit breaker

Rated current(A)63012501600
Rated short-time withstand current(kA)202,531.5 2,531.5 31.5
Fixed contact size D(mm)φ35φ49φ55
Interphase distance(mm)275±1.5
Drive travel(mm)300±2

 Overall dimension of VS1-24(fixed)indoor high-voltage alternating-current vacuum circuit breaker(large-current)

Rated current(A)200025003150
Rated short-time withstand current(kA)31.531.531.5
Fixed contact size D(mm)φ79φ109φ109
Interphase distance(mm)275±1.5
Drive travel(mm)300±2


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