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 vacuum 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.

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

Product offering Vacuum Interrupters-1

Product offering Vacuum Interrupters-2


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 – Vacuum interrupters can be expected to last the life of the equipment in which they are installed
  • Controlled contact erosion results in virtually maintenance-free operation
  • Fast interrupting speed – The interruption mechanism is independent of current magnitude, so interruption can normally be anticipated at the first current zero with no re-striking
  • Rapid dielectric recovery – The dielectric strength of the contact gap recovers more rapidly than the recovery voltage can rise, eliminating re-striking
  • High cycle withstand voltages
  • Robust, compact design – Vacuum dielectric enables contacts to be arranged close together so circuit interruptions can be designed in a smaller envelope
  • Environmentally friendly – Current interruption occurs in a vacuum, so there is no emission of greenhouse or toxic gases
  • Atmospheric contact contamination is eliminated
    • Oxides and corrosion layers cannot form in the vacuum environment
  • Noise-free and flash-free – All arcing is confined within the vacuum interrupter body


  • Load break switches
  • Contactors for industrial and motor control (example: Jennings contactors use Jennings vacuum interrupters)
  • Capacitor bank switching
  • Circuit breakers
  • Specialty RF and DC applications


  • Power distribution
  • Power transmission
  • Industrial
  • Airport
  • Steel smelters
  • Offshore drilling
  • Mining
  • Rail