Vacuum Interrupters

Current interruption in a vacuum is recognized as the ideal switching technology in the medium voltage range, and it’s also applied in high-voltage and low-voltage applications. Excellent switching capabilities and compact design make vacuum interrupters the most economical switching device solutions possible. Jennings interrupter designs handle a wide range of voltage and current interrupt levels, and high quality and highly reliable interrupters are available for the utility and industrial markets. The interrupters are ideal for utility applications (up to 38.0 kV), industrial applications (up to 7.2 kV) and RF and DC applications (up to 50 kV and 40 kVDC).

Jennings vacuum interrupters

Jennings vacuum interrupters feature an evacuated ceramic insulating envelope surrounding two contacts, one fixed and one movable. The movable contact is operated from the outside through a metallic bellows. Contacts are typically a copper alloy that is developed for use in AC voltage applications. The end plates are made of stainless steel or copper.

Features and benefits

  • Long life, high reliability
  • Controlled contact erosion results in virtually maintenance-free operation
  • Fast interrupting speed
  • Rapid dielectric recovery
  • High cycle withstand voltages
  • Robust, compact design
  • Environmentally friendly
  • Atmospheric contact contamination is eliminated Oxides and corrosion layers cannot form in the vacuum environment
  • Noise-free and flash-free


  • Load break switches
  • Contactors for industrial and motor control (example: Jennings contactors use Jennings vacuum interrupters)
  • Capacitor banks
  • Electrical power generation & distribution systems
  • Line dropping
  • High power transmitters
  • RF induction
  • Electrical furnaces
  • Circuit breakers
  • Specialty RF and DC applications

The unique advantages of switching in a vacuum, makes vacuum interrupters useful in industrial applications.  Due to advances in interrupter technology and the availability of new low-cost designs, vacuum interrupters are finding many new uses.

Vacuum Interrupter Products


Cat No.Operating V oltage (kV)1 minute DWV (kV)Rated short circuit current (A RMS)Rated continuous current (A RMS)Contact force at contact separation (lbs. Max.)Mechanical Life (operations)Body diameter (in.)Body Length (in.)Total Length (in.)Stroke contact gap, in.) 
RP1583.645-3007,7 ± 20%20000002.442.814.490.11
RP2332540-3 at 32 MHz2 lbs. 8 oz.15000001.314.185.680.12

Selection guide table

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