Guide Vacuum switchgear

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When the current decreases, the rate of vapor release decreases and after current zero, the medium regain its dielectric strength if the vapor density is reduced. When current to be interrupted is very small in a vacuum, the arc has several parallel paths. The total current is divided into many parallel arcs which repel each other and spread over the contact surface. This is called diffused arc which can be interrupted easily. At high values of current, the arc gets concentrated in a small region.

Vacuum interrupter

It causes rapid vaporization of the contact surface. The interruption of the arc is possible if arc remains in diffused state.

If it is quickly removed from the contact surface, the arc will be re-strike. Arc extinction in vacuum breakers is greatly influenced by material and shape of the contacts and the technique of considering metal vapor. The path of the arc is kept moving so that temperature at any one point will not be high.


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After the final arc interruption, there is rapidly building up of dielectric strength which is peculiar of the vacuum breaker. They are suitable for capacitor switching as it will give a re-strick free performance. The small current is interrupted before natural current zero, which may cause chopping whose level depends on the material of contact. Vacuum offers the utmost insulating strength. So it has extreme superior arc quenching properties than any other medium.

The vacuum circuit breaker is today recognized as most reliable current interruption technology for medium voltage switchgear. It requires minimum maintenance compared to other circuit breaker technologies.


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  • The technology is mainly suitable for mainly medium voltage application. For higher voltage vacuum technology has been developed, but it is not commercially feasible. Vacuum circuit breakers are used in metal clad Switchgear and also in porcelain housed circuit breakers. We hope that you have got a better understanding of this concept.

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    Furthermore, any doubts regarding this concept or to implement any electrical and electronics projects ideas , please give your feedback by commenting in the comment section below. Here is a question for you, What is the working principle of VCB?

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    SION vacuum circuit breakers. Flexible use in industry and infrastructure SION vacuum circuit breakers control all standard switching tasks in medium-voltage distribution systems and are suited for installation in all air-insulated medium-voltage switchgear. Find the right vacuum circuit breakers for your needs Industry Mall.

    Portfolio Consistent portfolio — for voltage levels up to 24 kV The extensive SION vacuum circuit breaker portfolio includes a wide variety of pole-center distances and widths across flats in the 7. Identical compact dimensions and connection dimensions across several voltage levels reduce planning costs and the number of switchgear panel versions. All SION vacuum circuit breakers are highly reliable, and available. They are maintenance-free for up to 10, operating cycles. SION vacuum circuit breakers — your benefits.

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    SION vacuum circuit breakers | Components | Siemens

    Easy to install in air-insulated medium-voltage switchgears High reliability Compact design Remote switching via remote control unit Low planning costs Maintenance-free design Long service life. Fast, reliable, and efficient SION 3AE5 vacuum circuit breakers are suited for all standard switching applications in medium-voltage power distribution and industrial networks: from switching load and short-circuit currents to connecting network or busbar sections. Space-saving and flexible The SION Lateral 3AE6 vacuum circuit breakers are specifically designed for low apparent power ratings in secondary medium-voltage power distribution.

    Portfolio overview Download flyer. Downloads and Support Take advantage of our services Here you will find important information, documents, and addresses relating to low-and medium-voltage power distribution. Catalog HG Image database Tender specifications. Siemens Industry Online Support. Technical Forum.

    Training courses. Support Request. Ordering vacuum circuit breakers The right solution for all standard medium-voltage switching tasks Learn, configure, then order: Detailed technical information on the SION vacuum circuit breakers is available in the Industry Mall.