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  • 15.5, 27 and 38 kV
  • 200 and/or 600 A continuous and interrupting at all voltages.
  • 95, 125 and 150 kV BIL at 15.5, 27 and 38 kV respectively
  • 20 kA asymmetrical momentary at all voltages
  • 20 kA asymmetrical fault close at all voltages
  • 64 kA asymmetrical fault close at all voltages with Kearney C.L. Fuses
  • 35 kV – 600 A, 2 kA, 10 kA
  • 15-25 kV – 600 A, 2 kA, 10 kA 12 kA
  • 3-phase
  • 15-25 kV up to 4 ways, 35 kV up to 3 ways

Standard features

  • Stainless steel tank
  • Bolt down mounting feet
  • Lifting eye
  • Ground lugs
  • Welded 200 A wells or 600 A bushings
  • Schematic switch diagram
  • Pressure gauge

Optional accessories

  • Manual selector switch interlock
  • VACop I  motor actuator
  • VACop III single shot open stored energy spring operator
  • VACop IV manual remote cable operator
  • Automatic transfer control

Features and benefits

Operation is in a self-contained fireproof medium—with elbow terminations—with remote switching options
Accomplished with a vacuum switching medium and an SF6 self-contained operation medium—largest unit fits through manhole openings—volume is approximately 1/5 that of equivalent oil switches
Maintenance free

All switches, mechanism and bus work sealed within a corrosion-resistant 300 series stainless steel enclosure in an inert SF6 environment

The vacuum interrupter housed in a sealed environment is essentially maintenance free throughout its lifetime

Ideal switching

Vacuum arc interrupters are fast, efficient, quiet and not susceptible to the danger of contamination from load switching arcs, lightning or other surges

When closed an ideal conductor, when open an ideal insulator

Contact design prevents current chopping

Minimize liabilities

Nonflammable insulating SF6 gas will not support combustion in the event of a short circuit inside the switch

This will guard against possible costly liabilities relative to adjacent electrical apparatus, private property, high-rise buildings, schools, extended outages, etc.

Estimated at approximately 100 lbs. per three-phase way or 1/7 that of an equivalent oil switch
Not position-sensitive—may be mounted on floors, from walls or ceiling with complete elbow operating flexibility
Installation time
Less than half when compared with oil switches
Accommodates four three-phase or single-phase circuits with many switching combinations in one compact enclosure
Switching operations
Approximately 25 times greater than that obtained with liquid switching mediums
Include short stroke manual, remote control manual, electric automatic, spring loaded automatic for new or retrofit operations
Control intelligence includes all conventional PTs, CTs and relays
Low profile enclosures include VACpac switchgear with tap fusing and/or relay protection schemes incorporating elbow switching concepts
Heavy gas 
SF6 is heavier than air and will not “leak upward"
Operating mechanism

Low energy requirements to switch vacuum interrupters permit long operating life

Provides positive quick make-break switching

Fault energy withstand
A vacuum switch failure can withstand an energy let-thru in SF6 gas 200 times greater than that of a liquid insulating medium
Reduced voltage
Higher voltage rated VACpac switchgear may be operated at reduced voltages in anticipation of a future voltage conversion
High voltage switching manual and/or remote for subsurface, surface and vertical distribution circuits
Turnkey package systems

Switch complete with controls, accessories and terminations

(Cables not included)

Performance tests

Test notes
a. This testing exceeds the requirements of ANSI C37.71 for submersible switchgear
b. The number of switching functions for various circuit conditions were in excess of 360 operations
c. The 6 fault close operations exceed by a factor of 2 maximum requirements for submersible switchgear
d. When the testing was discontinued, the test switch was yet electrically and mechanically sound
Interrupting Tests
a. Load switching — Close and Open 
600 20
300 30
50 10
b. Magnetizing current — Open only
21 10
7 10
c. Cable Charging Current — Close and Open
25 20
Mechanical operation test
a. Close and Open
-0- 50
b. High potential @ 30 kV — Open 

Momentary current test
a. Calibration — Closed
12,000 3
b. 10-cycle duration — Closed
20,000 9
Making current test (Fault Close)
a. Reduced voltage — Close
10,000 2
b. Full voltage — Close
20,000 3
Withstand test
a. High potential @ 42 kV — Open

Thermal runaway test 
a. Continuous loading 
600 OK
Thermal stability — Closed
Mechanical operations test
a. Close and Open
-0- 200
b. Continuity — Closed
-0- OK
c. High potential @ 38 kV — Open
-0- OK
Making current test (Fault Close)
a. Reduced voltage — Close
10,000 3
b. Full voltage — Close
20,000 3