Meiden vacuum capacitor

Vacuum capacitorsLineup of Vacuum Capacitors

All models are RoHS compliant. Drawing on its more than 40 years of engineering and how-hows on vacuum technologies developed through development and production of vacuum circuit breakers, we develop and manufacture highly reliable vacuum capacitors. There are two methods to produce the vacuum products: the constant air exhausion method by vacuum pump and the vacuum sealing method at the every manufacturing stage. Our vacuum capacitors are manufactured with the vacuum sealing method. It also incorporates a mechanism to retain the vacuum state for a long period of time.
- Because the electrodes are located in a vacuum container, external factors such as atmospheric pressure, temperature, humidity, or dust have nearly zero impact to the characteristics of our vacuum capacitors.
- There is neither change nor deterioration of the withstand voltage and the capacity characteristics as long as vacuum level is maintained. The vacuum life of the vacuum container is 10 years or more.
- Breakdown voltage is as high as more than 10 times that of the atmosphere. This allows us to make the compact and lightweight products.
There are rich product line-ups. Please contact us regarding special specifications or customization requests. For cautions against the handling, operations or for characteristics details, please refer to our catalog.

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Applicable fields
Features of vacuum capacitors
  • Low loss
  • Stability
  • Safety
  • Long life
  • High withstand voltage

Lineup list

Lineup of various capacitorsUsage Guide

Lineup of fixed capacitors

Types Peak voltage(kVp) Major capacitance
variable range(pF)






What is a vacuum capacitor?

A vacuum capacitor is an electrical part having a low ESR (equivalent series resistance) and an extremely small dielectric loss among many existing capacitors.
As such, the allowable current of the capacitor is large at high frequency of 1 MHz to a few 100 MHz, and the capacitor has a very good temperature characteristic.
Because the electrode part is in vacuum, there is nearly zero impact from temperature, humidity, and dust.
Since the dielectric constant is 1, the capacitance is small: 1 pF to 6,000 pF. As the electrode part is insulated by vacuum, the voltage resistance is 3 kVp to 40 kVp. It is ideal for the application requiring the high voltage.

Internal structure

The vacuum capacitor is a high performance capacitor in which the electrode part that stores electric charges is arranged in a ceramic vacuum vessel. We realized compact design, high withstand voltage and high current power flow by adopting a ceramic vessel (with high thermal resistance against the energized heat) and the vacuum structure(with high insulation performance.) It has high reliability for applications that require large power.
Since we adopted the dielectric of the capacitor by vacuum, and ceramics with high insulation and low-loss electrode materials, we could curtail the loss coefficient of the capacitor to the very small level.
The variable vacuum capacitor has a structure in which the capacitance can be changed by increasing or decreasing the facing area by moving one of the facing electrodes installed in the vacuum vessel up or down.
Further, the fixed vacuum capacitor has a structure in which the capacitance does not change because the facing electrodes in the vacuum container are fixed and the facing area does not change.

Fixed type

Variable type

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