MV Vacuum Circuit Breaker (VCB)

What is a vacuum circuit breaker?

A vacuum circuit breaker is a circuit breaker quenching arc in a vacuum medium. The on-off, on-off, and associated arc breaking operations with current contacts are carried out in the vacuum chamber of the circuit breaker, known as the vacuum circuit breaker.

Vacuum as arc extinguishing medium in circuit breaker is called vacuum circuit breaker because the vacuum has superior arc extinguishing performance so that it has high insulation strength. This applies to most standard voltage applications, as for higher voltages, vacuum techniques are developed but are not commercially viable.

ZW8-12 Outdoor 12KV MV VCB high voltage vacuum circuit breaker

Outdoor 12KV MV VCB power system,mainly used for breaking,closing urban areas 10KV grid load current,load current and short circuit current.

VS1 12KV Indoor VCB vacuum circuit breaker

Indoor high voltage vacuum circuit breaker (circuit breaker) is suitable for indoor switchgear of 12kv power system

ZW20 High Voltage MV 12KV VCB Vacuum Circuit Breakers with the controller

with controller, distribution automation system,and can raliably and effectively complete the recloser function of traditional.

VSG-12 indoor high voltage vacuum circuit breaker 12KV MV VCB

for 12KV power system indoor switching equipment, as power grid equipment, industrial and mining enterprises power design protection and control unit

ZW32-12 outdoor medium voltage vacuum circuit breaker recloser controller 12KV by motor

ZW32-12 outdoor medium voltage vacuum circuit breaker recloser controller 12KV by motor

12KV Indoor high voltage vacuum circuit breaker (circuit breaker) MV VCB

for indoor switchgear of 12kv power system, for switching various loads of different nature, frequent operations, and multiple interruption of short-circuit current.


The working principle of the vacuum circuit breaker is that once the circuit breaker contact is disconnected in a vacuum, the contact is ionized by the metal vapor in the contact and produces an arc. However, due to the rapid condensation of electrons, ions, and metal vapors generated in CB contact outside the arc, the arc is easily quenched, so dielectric strength can be quickly restored. The most important feature of a vacuum is that once an arc is created in a vacuum, it can be extinguished quickly due to the rapid increase in the dielectric strength of the vacuum.

Characteristics of vacuum circuit breaker

Compared with other types of circuit breakers, the insulation medium of vacuum circuit breakers has higher requirements on arc suppression performance. The pressure in the vacuum blocker is about 10-4 for the flood, which includes very few molecules in the blocker. This circuit breaker basically has the following two characteristics.

Compared with other insulating media used in circuit breakers, the circuit breaker is a superior insulating medium. It is superior to other media except for SF6 and air because these media are used at high pressure.

Application of vacuum circuit breaker

A vacuum circuit breaker is currently recognized as the most reliable medium voltage switching current interruption technology. It requires minimal maintenance compared to other circuit breaker technologies.

The technology is mainly suitable for medium voltage applications. For high-pressure vacuum technology has been developed, but it is not commercially feasible. The vacuum circuit breaker is suitable for both metal-clad switchgear and ceramic clad circuit breaker.

Supplier of vacuum circuit breaker

Zhejiang JGGY Electrical Co.,Ltd (, JGGY Electrical was established in 2007, specializing in the manufacture, sales and service of high-voltage electrical products. We mainly specializes for 6~42kV medium voltage electric (outdoor and indoor): load break switch, Disconnector, cutout fuse, Surge Arrester, vacuum circuit Breaker.  Over the years, JGGY have been successfully used in important fields such as electric power, communications, chemicals, mining, metallurgy, transportation, petroleum, and railways.

Get a quote on the latest price of vacuum circuit Breaker, load break switch, Disconnector, cutout fuse, Surge Arrester from JGGY. We will reply within 24 hours.

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