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High Voltage 40.5kV AC Vacuum Circuit Breaker

VB5(ZN21D) indoor high-voltage AC vacuum circuit breaker is an indoor high-voltage switchgear with rated voltage of 40.5kV and three-phase AC 50/60Hz. It can be used as the control and protection of electrical equipment in industrial and mining enterprises, power plants and substations, and it is suitable for frequent operation.

  • Brand:

    TIANYI
  • Item NO.:

    VB5(ZN21D)
  • Order(MOQ):

    1
  • Payment:

    T/T 30%
  • Product Origin:

    FUZHOU,CHINA
  • Shipping Port:

    FUZHOU
  • Lead Time:

    30 days
  • Product Detail

More than 20 years of operation has proved that indoor vacuum circuit breaker VB5 type and its series of products have quite superior advancement and reliability. VB5 vacuum circuit breaker is suitable for indoor switch system with air insulation. As long as it is within the normal operating conditions and the technical parameters of the circuit breaker, the VB5 vacuum circuit breaker can meet various operations of the power grid under normal or accident conditions, including closing and breaking short-circuit currents.



VB5 vacuum circuit breaker is suitable for indoor switching systems with air as insulation. type vacuum circuit breaker can satisfy all kinds of operation of power grid in normal or accident state, including closing and opening short circuit current, as long as it is within the normal service conditions and the technical parameters of the circuit breaker.


VB5 vacuum circuit breaker has excellent performance in the case of frequent operation and short circuit current.Fully meet the requirements of automatic reclosing and has high operational reliability and service life.



1、Main electrical performance parameters


NO. Item Unit Data
1 Rated voltage kV 40.5
2 Rated insulation level 1min Power frequency withstand voltage (effective value) kV 95
Lightning impact withstand voltage (peak) kV 185
3 Rated frequency Hz 50/60
4 Rated current A 630 1250 2500
5 Rated short circuit breaking current kA 25、31.5
6 Rated short-time withstand current( 4s) kA 25、31.5
7 Rated peak withstand current kA 63、80
8 Rated short-circuit making current kA 63、80
9 Rated breaking current of capacitor bank A 630(single)
10 Rated operation order O - 0.3s - CO - 180s - CO
11 Breaking times under rated short-circuit current times 50
12 Secondary circuit (1 min) power frequency withstand voltage V 2000
13 Main circuit resistance(without plum blossom contact) μΩ ≤55(630A)≤50(1250A)≤45(2500A)

2、Mechanical characteristic parameter:

NO. Item Unit Data
1 Distance between contacts mm 20 ±2
2 Contact stroke mm 7.5±1.5
3 Moving and static contactor allows accumulated wear thickness mm 3
4 Average closing speed(8mm contactor close) m/s 1.0-1.6
5 Average opening speed(0~8mm stroke) m/s 1.4-2.0
6 Opening time ms 20-65
7 Closing time ms 20-75
8 Three - phase contactor opening and closing simultaneity ms ≤2
9 Three - phase contactor opening asynchronous ms ≤2
10 Contactor closing bounce time ms ≤5
11 Contactor opening bounce range mm ≤2
12 Buffer stroke mm 13 ± 1
13 Mechanical life times 30000



1. Altitude: ≤1000m.

2. Surrounding air temperature: upper limit +40 ° C, lower limit -25 ° C (alpine region) and -1 ° C (general region).

3. Relative humidity of surrounding air: when the maximum temperature is +40, it is not more than 50%. When the temperature is low, it is allowed to have a large relative humidity. Due to the change of temperature, it may occasionally has condensation effect.

4. Outdoor wind speed shall not exceed 34m/s.

5. The slope of the ground shall not exceed 3°.

6. The horizontal acceleration of the earthquake shall not more than 0.4m/s, and the vertical acceleration shall not morn than 0.2m/s;

7. The installation site shall be free from fire, explosion, serious pollution, chemical corrosion and violent vibration.

Note: if the actual conditions of use cannot be met, please negotiation with the manufacturer.




Q: Are you the manufacturer or trader?

A: We are both manufacturer & trader. We have our own manufacturer named TIANYI TONGYI ELECTRIC CO.,LTD, who have 27 years experience in electric industry. It covers an totally area of 117,000 m2 with 300 employees, also is a qualified supplier of China National Nuclear Corporation(CNNC) and main supplier for State Grid & China Southern Power Grid.


Q: What is your after-sales service?

A: We always provide free online service and technical support within 24 hours. 18 months warranty for customers.


Q: What is your delivery time?

A: Normally 25~35days. It depends on the order quantity and season. We have very strong capacity to produce top quality products, please inquiry us if you have any questions.


Q: What is the quality warranty time?

A: We have quality certificate CCC, CQC, ISO9001, CE ... Meanwhile, we can provide 18 months warranty for our products. Free online service and technical support within 24 hours is always provided to our customers.


Q: Do you accept ODM and OEM?

A: Yes. We have professional R & D teams to update and develop the latest technology. We also can support ODM or OEM, please send us details drawing to discuss.


Q: What is your payment terms?

A: Generally there are two payment terms:

a) 30% advance payment via T/T as a deposit, balance 70% against the shipping documents

b) Irrevocable L/C at sight


Q: If I want to visit you, how to go?

A: Our factory is located in Luoyuan County, Fuzhou City. Details address is Songshan Area, Taiwan Investment Zone, Luoyuan County, Fuzhou City, Fujian Province,China.

a) The nearest airport is Fuzhou Airport, if you come by air, please arrive in Fuzhou Airport, it takes 1 hour from the airport to our factory

b) The nearest train station is Luoyuan Station, if you come by train, please arrive in Luoyuan Station, it takes only 5 minutes to our factory.

Anyway, please contact us in advance, we will send the car to the airport or train station to pick you up.Sincerely welcome you to come and visit us.


Q: Do you need agents?

A: Yes, we welcome you to be a parter. Welcome to contact us for more information.






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