VB4 Series Vacuum Circuit Breaker

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VB4P medium-voltage indoor vacuum circuit breaker is applicable for three-phase AC power system of rated voltage up to 12~24kV and frequency 50/60Hz,widely used in many fields such as power plant, transformer substation, petrol chemical industry, metallurgy, manufacturing industry, airport, residential area, etc., to control and protect the electric equipment, especially, It is used for the occasion that needs infrequent operation at rated current or multi-breaking short circuit current, may be mounted in the indoor air insulating switchgear like type KYN28 or AMS, ABB type ZS1 series, etc. This circuit breaker is standards refer to IEC60694.

This circuit breaker is made with mature APG technology. The application of VB4P terminal buffer guarantees the indoor terminal is ever more reliable in nay operation environment. VB4P can fully meet the requirement of GB, DL, IEC, DIN, VDE as well as standards of other advanced industrial countries.

Service Environment

a) Air temperature: Maximum temperature: +40℃; Minimum temperature:-25℃

b) Humidity: Monthly average humidity 95%; Daily average humidity 90% .

c) Altitude above sea level: Maximum installation altitude: 2500m

d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.

e) No frequent violent shake

Technical Data

No Item Unit Parameter
1 Rated voltage kV 12/17.5 24
2 Rated frequency Hz 50/60 50/60
3 Rated current A 630 to 4000A 630 to 4000A
4 1min Power frequency withstand voltage kV 48 65
5 Lightning impulse withstand voltage kV 75/95 125/150
6 Rated short circuit breaking current (peak) kA 50/63/80/100 50/63/80/100
7 Rated active load and close circuit breaking current A 63 50
8 Rated short breaking current kA 31.5 31.5
9 Rated short circuit making current (peak) kA 50/63/80/100 50/63/80/100
10 Rated cable(line) charging breaking current A 50 and 10 50 and 10
11 Rated capacitor bank switching current A 400 400
12 Rated withstand current (peak) kA 50/63/80/100 50/63/80/100
13 Short time withstand current (4s) kA 20, …40 20, …40
14 Mechanism life times 10000 10000

Product structure

1. Electrical control
2. Closing system*
3. Energy storage system**
4.Holding structure
5.Surface treatment
6.Breaking brake buffer

Embeded pole design

  • High Reliability

Compared with the traditional assembled pole, the number of parts, conductor connection surface connecting fasteners used for the Embedded Pole can be reduced by a big margin so as to simplify the assembly procedure of the main circuit, lower the circuit resistance and enhance the reliability of the main circuit connection.

  • Stable Insulating Property

After the vacuum interrupter is embedded in the solid epoxy resin material, the external environment of the pole can make the lowest effect on the vacuum interrupter. With the external insulating capacity, the pole can not be affected by dust, humidity, small animals, condensation and pollutions. It can completely meet the creepage distance requirement of the II-grade polluted region specified in the GB/DL Standard.

  • Firm Structure

Provide the sufficient protection for the vacuum interrupter so that it can not suffer the accidental mechanical collision in the process of assembling or transportation.

  • Miniaturization

Adopt the epoxy resin as the insulation medium to reduce the phase distance and decrease the volume of the vacuum circuit breaker & its matching switch cabinet.

  • Free Maintenance

As the whole pole is poured into the integral component, the vacuum interrupter can get the sufficient protection. The free maintenance of the vacuum interrupter can provide the condition for the free maintenance of the circuit breaker.

Installation size