Eaton VisoVac User manual

15kV Class Padmount VisoVac™ instruction manual
Network Protectors
MN024004EN Effective April 2021
New Issue

ii INSTRUCTION MANUAL MN024004EN April 2021
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY
The information, recommendations, descriptions, and safety notations in this document are based on Eaton Corporation’s
(“Eaton”) experience and judgment and may not cover all contingencies. If further information is required, an Eaton sales
office should be consulted. Sale of the product shown in this literature is subject to the terms and conditions outlined in
appropriate Eaton selling policies or other contractual agreement between Eaton and the purchaser.
THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES
OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, OTHER THAN THOSE SPECIFICALLY SET OUT IN ANY
EXISTING CONTRACT BETWEEN THE PARTIES. ANY SUCH CONTRACT STATES THE ENTIRE OBLIGATION OF EATON. THE
CONTENTS OF THIS DOCUMENT SHALL NOT BECOME PART OF OR MODIFY ANY CONTRACT BETWEEN THE PARTIES.
In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or
otherwise for any special, indirect, incidental, or consequential damage or loss whatsoever, including but not limited to
damage or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use of
existing power facilities, or claims against the purchaser or user by its customers resulting from the use of the information,
recommendations, and descriptions contained herein. The information contained in this manual is subject to change without
notice.

iiiINSTRUCTION MANUAL MN024004EN April 2021
Contents
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY ................................... ii
SAFETY FOR LIFE .........................................................................iv
SAFETY INFORMATION ....................................................................iv
Safety instructions.............................................................................. iv
PRODUCT INFORMATION................................................................... 1
Introduction ....................................................................................1
Read this manual first ............................................................................1
Additional information ............................................................................1
Acceptance and initial inspection ...................................................................1
Handling and storage.............................................................................1
Standards .....................................................................................1
Application and description ........................................................................2
RATINGS AND SPECIFICATIONS ............................................................. 2
FEATURES AND CONSTRUCTION ............................................................ 3
Terminations ...................................................................................3
Mounting ......................................................................................3
Control voltages ................................................................................4
V1 AND V3 SWITCHGEAR STYLES ........................................................... 5
V1 – Vacuum interruption only......................................................................5
V3 – Vacuum interruption with visible isolation and visible grounding .......................................6
Accessories ....................................................................................7
SEQUENCE OF OPERATIONS – V1 STYLE SWITCHGEAR .........................................10
SEQUENCE OF OPERATIONS – V3 STYLE SWITCHGEAR .........................................11
Source way operation example ....................................................................11
SEQUENCE OF OPERATIONS – V3 STYLE SWITCHGEAR ........................................ 13
Load way operation example......................................................................13
V3 ISOLATION AND GROUNDING INTERLOCK SCHEME ........................................ 15
INSPECTION AND MAINTENANCE .......................................................... 15
SAFETY FEATURES ....................................................................... 16
CONTROL OPTIONS .......................................................................17
Manual control.................................................................................17
Remote control ................................................................................17
Communications module ........................................................................17
Automatic transfer control........................................................................17
APPENDIX ...............................................................................17

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Safety for life
Eaton meets or exceeds all applicable industry standards relating to product safety in its Cooper Power™ series products.
We actively promote safe practices in the use and maintenance of our products through our service literature, instructional
training programs, and the continuous efforts of all Eaton employees involved in product design, manufacture, marketing, and
service.
We strongly urge that you always follow all locally-approved safety procedures and safety instructions when working around
high-voltage lines and equipment, and support our “Safety For Life” mission.
Safety information
The instructions in this manual are not intended as a
substitute for proper training or adequate experience in the
safe operation of the equipment described. Only competent
technicians who are familiar with this equipment should
install, operate, and service it.
A competent technician has these qualifications:
● Is thoroughly familiar with these instructions.
● Is trained in industry-accepted high- and low-voltage safe
operating practices and procedures.
● Is trained and authorized to energize, de-energize, clear,
and ground power distribution equipment.
● Is trained in the care and use of protective equipment
such as arc flash clothing, safety glasses, face shield,
hard hat, rubber gloves, clampstick, hotstick, etc.
Following is important safety information. For safe
installation and operation of this equipment, be sure to read
and understand all cautions and warnings.
Hazard Statement Definitions
This manual may contain four types of hazard statements:
DANGER
Indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury.
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
NOTICE
Indicates a potentially hazardous situation which, if not
avoided, may result in equipment damage only.
Safety instructions
The following are general caution and warning statements
that apply to this equipment. Additional statements related
to specific tasks and procedures are located throughout this
manual.
DANGER
Hazardous voltage. Contact with hazardous voltage will
cause death or severe personal injury. Follow all locally-
approved safety procedures when working around high-
and low-voltage lines and equipment. G103.3
WARNING
Before installing, operating, maintaining, or testing this
equipment, carefully read and understand the contents
of this manual. Improper operation, handling, or
maintenance can result in death, severe personal injury,
and equipment damage. G101.0
WARNING
This equipment is not intended to protect human
life. Follow all locally-approved procedures and safety
practices when installing or operating this equipment.
Failure to comply can result in death, severe personal
injury, and equipment damage. G102.1
WARNING
Power distribution and transmission equipment must
be properly selected for the intended application. It
must be installed and serviced by competent personnel
who have been trained and understand proper safety
procedures. These instructions are written for such
personnel and are not a substitute for adequate training
and experience in safety procedures. Failure to properly
select, install, or maintain power distribution and
transmission equipment can result in death, severe
personal injury, and equipment damage. G122.2
!
SAFETY
FOR LIFE
!
SAFETY
FOR LIFE

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Product information
Introduction
This instruction manual bulletin covers the installation,
operation, and maintenance for the 15 kV Class Padmount
VisoVac™ switchgear.
Read this manual first
Read and understand the contents of this manual and follow
all locally approved procedures and safety practices before
installing or operating this equipment.
Additional information
These instructions cannot cover all details or variations
in the equipment, procedures, or process described nor
provide directions for meeting every possible contingency
during installation, operation, or maintenance. For additional
information, contact your Eaton representative.
Acceptance and initial inspection
Each Padmount VisoVac is in good condition when accepted
by the carrier for shipment. Upon receipt, inspect the
shipping container/crate for signs of damage. Unpack the
switchgear and inspect it thoroughly for damage incurred
during shipment. If damage is discovered, file a claim with
the carrier immediately.
Handling and storage
Be careful during handling and storage of the padmount
switchgear to minimize the possibility of damage. If
the switchgear is to be stored for a long time prior to
installation, provide a clean, dry storage area.
The switchgear lifting brackets will vary based on the style
of switchgear. Users should reference the mechanical
drawings provided with the switchgear for location of the
lifting points associated with that equipment. See Figure 1,
Figure 2, and Figure 3 for common examples of lifting point
locations. Lifting angles and brackets can be removed after
installation.
Standards
ISO 9001 Certified Quality Management System
IEEE Std C37.74™-2014
IEEE Std C57.12.40™-2011
IEEE Std C57.12.28™-2014
IEEE Std C12.57.29™-2014
Lifting points
Figure 1. Lifting point example #1
Lifting points
Figure 2. Lifting point example #2

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Lifting pointsRemovable lifting angle
Figure 3. Lifting point example #3 (doors not shown)
Application and description
The medium-voltage Padmount VisoVac from Eaton delivers
economical, reliable, and flexible solutions for distribution
load switching applications.
Eaton’s Padmount VisoVac is a three-phase, load and high-
fault interrupter. Depending on the design, it is suitable
for both indoor and outdoor application. Features like
visible isolation and visible grounding may be included.
The electrical insulation medium is air (no SF6 gas or oil is
used). The vacuum interrupting mechanism can be remotely
operated from a safe distance with a two-button pendant or
remote operation system.
The VisoVac enclosure comes standard with powder-coated
mild steel construction. The enclosure is also available
in stainless steel construction. The Padmount VisoVac
switchgear is specifically designed with a higher interrupting
rating and higher operations.
CAUTION
Before energizing the VisoVac assembly, ensure that:
1. The VisoVac assembly is secured on a true and level
surface.
2. All fastening hardware is in place and tightened.
3. All conductor connections are torqued to the correct
value.
Ratings and specifications
Table 1. General Specifications
Feature 25 kA 40 kA
Rated Maximum Voltage, 50/60 Hz
Maximum Design Voltage, kV115.5/17.5 15.5/17.5
Impulse Withstand Voltage
Line to ground (kV BIL) 95 95
Open Contact (kV BIL) 95 95
Withstand Voltage, 60 Hz
1 min withstand, AC kV 35 35
5 min withstand, DC kV 53 53
Continuous Current, 50/60 Hz (A) 600/900 600/900
Load Break Current, 50/60 Hz (A) 600/900 600/900
Momentary Withstand (asym pk.) 65 104
1s sym withstand rating, kA 25 40
Sym interrupting rating, kA 25 40
Fault Close (asym pk.) 65 104
5s withstand in ground position, kA 15 15
0.2 withstand in ground position, kA 45 45
Mechanical breaker operations 10,000 10,000
1. Switchgear applied at 5 kV may contain 5 kV Class rated equipment depending on the
application, consult factory for details.

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Features and Construction
The VisoVac fault interrupter utilizes a stored-energy spring
charged mechanism for OPEN and CLOSE operations. The
gear comes standard with a spring charging motor on all
VFI (Vacuum Fault Interruption)-ways with optional spring
charge motors for all switched-ways. Each way comes with
OPEN and CLOSE pushbutton controls and spring charge
indication.
Terminations
Standard padmount terminations are IEEE 386 600 A
deadbreak elbow style bushings mounted in the rear of
the padmount enclosure on the opposite side of breaker
controls. This is also known as Eaton’s Control front/Cable
rear design (see Figure 4). Eaton also offers designs with
the bushings and breaker controls on the same side (see
Figure 5). This style switchgear can be provided in double-
sided or single-sided layout designs.
The following figures show the features of each of these
designs.
Controls
Bushings
Figure 4. Control front/Cable rear design. Controls are
located in front and switchgear bushings are located in
the rear of the enclosure.
Controls Bushings
Figure 5. Controls and bushings located on same side.
Applies to both double-sided and single-sided designs.
In some cases, 600 A to 200 A reducers are provided if load
break elbows are required.
Mounting
The switchgear can be mounted directly on the floor or
concrete pad. The switchgear is suited for indoor or outdoor
applications. Users should reference the mechanical
drawings provided with the switchgear for location of the
base mounting points associated with that equipment. The
following are common examples of location and spacing for
the base mounting.
Base mounting Ø.56 (16 Total)
80.00
79.50
73.99
61.99
5.99
1.50
.00
.00
1.50
4.00
22.00
40.00
58.00
76.00
78.50
80.00
Figure 6. Control front/Cable rear base mounting
(dimensions in inches)

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
4.50
[114]
4.50
[114]
4.50
[114]
(18)
6.44
[164 ]
6.44
[164 ]
2.00
[51]
2.00
[51]
2.00
[51]
2.00
[51]
12.00
[305]
12.00
[305]
12.00
[305]
12.00
[305]
6.47
[164 ]
6.47
[164 ]
80.91
[2055]
18.00
[457]
18.00
[457]
18.00
[457]
18.00
[457]
81.00
[2057]
18.00
[457]
18.00
[457]
18.00
[457]
18.00
[457]
Ø.56
[Ø14]
Figure 7. Double-sided base mounting (inches [mm])
Control voltages
The switchgear is available in most commonly used AC
and DC voltages for control power and comes pre-wired to
reduce on-site field installation time. Users should reference
the electrical wiring schematics for details on the specific
control and auxiliary voltages used in the equipment. Note
that in some cases two different voltages may be used, one
class for protection and another for heaters or other ancillary
equipment.
Control Voltages available:
AC Control Voltages DC Control Voltages
110 VAC 24 VDC
120 VAC 48 VDC
220 VAC 110 VDC
240 VAC 125 VDC
220 VDC
250 VDC

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
V1 and V3 Switchgear Styles
V1 – Vacuum interruption only
Switchgear designated as V1 will only include vacuum
interruption capability. This style of switchgear does not
come equipped with visible isolation or visible grounding
capability. V1 style switchgear is available in both standard
and low profile Control front/Cable rear configurations and
double-sided configurations.
VFI
Figure 8. Control front/Cable rear configuration
VFI VFI
Figure 9. Double-sided configuration
The VisoVac fault interrupter’s vacuum interrupting
mechanism utilizes proven Eaton technology which allows
for an exceptional 25 kA or 40 kA interrupting rating.
Eaton’s environment friendly medium voltage interrupters
are capable of reliably switching high-stress currents and
carrying their rated continuous current without forced
cooling.
The interrupting mechanism was designed for applications
where space is a premium such as padmount environments.
The load break mechanism is available with up-to a 900
A continuous current rating and comes with a mechanical
endurance of 10,000 operations.
The three-phase vacuum interrupter can be opened
manually or remotely via SCADA, protective relaying
or pendant. The vacuum interrupter is equipped with a
mechanical indicator and non-resettable operations counter.
Eaton vacuum interrupters are the industry standard in
quality. Please note the following:
● Each Eaton vacuum interrupter is tested throughout the
manufacturing process and once again before packaging.
● A dielectric withstands test and a vacuum assurance test
are performed on every interrupter.
● Additionally, Eaton also incorporates a sequential bar
code that allows us to track material lots, as well as the
operators involved with building each interrupter in a
database.
Digitrip relay
Charging
handle
Key interlock
(optional)
Breaker
nameplate
Breaker status
and pushbutton
control
Figure 10. Eaton VCP-T vacuum breaker with Eaton
Digitrip 1150 V relay
Charged
Display
Figure 11. Vacuum interrupter status indicator. Left
image shows status indicator in the closed position,
the image on the right shows the status indicator in the
open position.

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
For information about Eaton VCP-T vacuum circuit breaker,
please use the following link here: https://www.eaton.
com/us/en-us/catalog/electrical-circuit-protection/mv-vcp-t-
vacuum-circuit-breakers.resources.html.
V3 – Vacuum interruption with visible isolation and
visible grounding
Switchgear designated as V3 will have vacuum interruption
capability and come with visible isolation and a visible
grounding capability. These features are mechanically
interlocked internally. V3 Style switchgear is only available in
a control front/cable rear configuration.
Rod viewing window
SIDE VIEW
FRONT VIEW
Ground Isolation
VFI
Figure 12. V3 control front/Cable rear configuration
Visible isolation
A three-pole, group-operated, non-load break, air insulated
isolation switch is located internal to the enclosure. This
feature also includes a viewing window to confirm a
physical disconnect between the source and load for that
particular switch or VFI way only. The isolation switch is a
non-load break switch and should never be used to break
load under any conditions.
Indicators are physically linked to the operating mechanism
and show what position the isolation switch is in. The
isolation switch is mechanically interlocked internally with
the vacuum interrupting load-break mechanism.
The isolation switch is also mechanically interlocked
internally with the grounding switch to prevent the
grounding switch from being operated while the isolation
switch is in the CLOSED position.
Visible grounding
A three-pole, group-operated grounding switch is included
internal to the enclosure. This feature also includes a
viewing window to confirm a physical ground connected to
incoming or outgoing bushings of the switchgear depending
on the application.
The grounding switch is equipped with mechanical
interlocks located internal to the enclosure to prevent
operation of the grounding switch while the visible isolation
switch is in the CLOSED position.
Indicators are physically linked to the operating mechanism
to show what position the ground switch is in.
WARNING
It is the duty of the operator to follow all local
procedures for proper operation of the switchgear. The
operator should always check that the bus connected to
the ground switch is NOT energized before operating.
Figure 13. V3 Series front viewing window [Isolation
(rear rods) & Grounding (front rods)]

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Figure 14. Visible isolation and grounding mechanism
indicator
Figure 15. Slip clutch tool
A slip clutch tool is provided with the switchgear and is the
only tool approved for use with the isolation and grounding
operation hubs. The slip clutch on the tool prevents the
operator from applying excess torque that could damage the
internal gearing.
NOTICE
Using other tools such as an impact tool could damage
the gearing in the VisoVac.
Figure 16. V3 series front mimic diagram
Accessories
The Padmount VisoVac switchgear is customized to order.
Therefore, each style of switchgear may be unique in how
it operates, the application it is used in, the accessories it
may contain, and the manufacturer of those accessories.
The following are the most commonly used accessories
supplied with the VisoVac.
Eaton Digitrip 1150 V Controller
Eaton’s Digitrip 1150 V is used for advanced current
and voltage protections, metering, and communication
functions.
The Digitrip 1150 V comes standard with energy harvesting
overcurrent protection capability. During loss of power or
voltage sag from a fault, the Digitrip can use the energy
of the fault to maintain protection and initiate a trip in the
absence of control power.
The controller continuously analyzes secondary current
signals from the current sensors. When the preset current
levels and time delay settings are exceeded, the controller
sends a trip signal to the trip actuator of the vacuum
interrupter. The trip actuator causes tripping of the vacuum
interrupter by providing the required mechanical force for
tripping.
The trip actuator is automatically reset each time the
vacuum interrupter opens. The current sensors, controller,
and vacuum interrupter are fully tested as a system for
time-over-current response over the entire current range up
to the interrupting rating of the vacuum interrupter.

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Rating
plug
24 character
LED display
LSIG mimic
curve
Cause of
trip LED
Manual
selection
Real-time
LED
Figure 17. Digitrip 1150 V controller
The Digitrip 1150 V trip unit can provide the following
protection and metering functions:
● 51 – Phase Long Delay
● 50T – Phase Short Delay
● 50 – Phase Instantaneous
● 51/50G – Ground Fault
● 37 – Phase Loss (Current Based)
● 46 – Current Unbalance
● 27 – Undervoltage*
● 59 – Overvoltage*
● 81U – Underfrequency*
● 81O – Over Frequency*
● 47 – Voltage Unbalance*
● 32 – Reverse Power*
● Thermal Memory – analyses the thermal loading of VFI
● Metering - I, V, kVA, kVAR, kW, THD, PF
*Voltage sensors are required for power and voltage related functions.
S-trip Close Motor
Tr i p
Actuator
DIGITRIP
Digitrip
Close
Handle
(LocalClose
Pos
Handle
(Local
OpenPos
Ground
(GRD2)
Aux
(Bcontact)
Aux
(Acontact)
Isolation
(ISO3B)
Isolation
(ISO3A)
Handle
(“Remote”Pos)
Remote
(Closesw)
Remote
(Opensw)
Spring
charge
Circuit
120VAC
Figure 18. V3 Switchgear control schematic with
Digitrip.
Eaton CH-Type current sensors are provided on ways using
the Digitrip 1150 V. CH-Type sensors come standard with
1A secondaries and are available with the following primary
current ratings: 100A, 200A, 250A, 300A, 400A, 6060A,
630A, 800A, 1000A, 1200A.
For more information about the Digitrip 1150 V, please see
the following link: https://www.eaton.com/content/dam/
eaton/products/electrical-circuit-protection/medium-voltage-
vacuum-circuit-breakers/mv-vcp-t-vacuum-circuit-breakers/
digitrip-models-1150v-and-1150vi-trip-units-for-type-vcp-t-vcp-
tr-medium-voltage-breakers-il66a7535h02.pdf.
Control Power Transformer (CPT)
Control power is supplied through a CPT upon request.
Please see the “Appendix” for associated product literature
and switchgear wiring schematics for CPT details. See
Figure 19 for equipment access detail.
Current Transformers (CT)
Current transformers are used for current measurement
for protection, control, and metering. When a Digitrip
1150V relay is provided, it is supplied with a rating plug
and matching CH-Type Eaton current transformers. See the
Digitrip 1150 V link provided above for details.

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
ote:N For all other relay styles, third-party CTs will be
provided based on user specifications. Please see
the “Appendix” for associated product literature
and switchgear wiring schematics for details. See
Figure 19 for equipment access detail.
Potential Transformer (PT)
Potential transformers can be used as a voltage measuring
device and/or control power source when capacity allows.
PTs are provided by third-party suppliers. Please see the
“Appendix” for associated product literature and switchgear
wiring schematics details. See Figure 19 for equipment
access detail.
Space heaters/thermostats
Generally, space heaters are provided to assist in
controlling condensation and temperature to maintain inside
temperature of the switchgear. Please see the “Appendix”
for associated product literature and switchgear wiring
schematics for details. See Figure 19 for equipment access
detail.
Surge arresters
Standard surge arresters provided with the VisoVac
switchgear are manufactured by Eaton. Please see the
product link below and the “Appendix” for switchgear
wiring schematics for details. See Figure 19 for equipment
access detail.
https://www.eaton.com/us/en-us/products/medium-voltage-
power-distribution-control-systems/lightning-arresters.html
Engineered-to-Order
All switchgear is based on application requirements.
Switchgear can come with unique protection and control
systems designed specifically for that application. Please
review all mechanical diagrams, layout drawings, electrical
schematics, and accessory-specific documentation for
details in the “Appendix” section of this document.
Access panels
The VisoVac switchgear comes standard with access panels.
Access panels are bolted panels that allow users to gain
access to the internals of the switchgear. These panels will
allow users to access some of the accessories previously
listed including fusing for control power and instrument
transformers. The following are examples of access panels.
Users should reference the mechanical layout drawings of
the equipment provided for associated details.
DANGER
The switchgear must be fully deenergized and local
lock-out tag-out and associated safety procedures must
be followed prior to removing the access panels.
Access panels
Access panels
Figure 19. Remove access panels

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Sequence of operations – V1 Style Switchgear
V1 style padmount switchgear only comes with vacuum interruption. VFI ways and switch ways can only be opened and
closed. Electrical interconnections vary depending on the application.
In this position, the vacuum interrupters are CLOSED. This
Model 9-V1example assumes all ways are energized and
SW-1 is the only source way. VFI-1+ are all load breakers
and with no load side sources. See Figure 21.
ote:N Red represents energized bus and green represents
de-energized bus.
LOAD BUS
SW-1
Source Loads
VFI-1 VFI-2 VFI-3
Figure 20. MODEL 9-V1 Single Line Diagram
VFI-1+SW-1
LoadsSource
Figure 21. V1 style padmount – All ways CLOSED
In this position, the vacuum interrupters are OPEN. Example
assumes all load ways (VFI-1+) are de-energized with no
load-side sources and SW-1 is the only source way. SW-1 is
OPEN, however the incoming source cable to the gear will
be energized. See Figure 22.
WARNING
The cables connected to all bushings, any control power
sources or stored energy devices such as capacitors
must be de-energized/discharged before gear is
considered de-energized.
VFI-1+SW-1
LoadsSource
Figure 22. V1 style padmount – All ways OPEN

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Sequence of operations – V3 Style Switchgear
Source way operation example
V3 style padmount switchgear comes with vacuum interruption, a visible isolation switch and visible grounding position. VFI
ways and switch ways can only be opened and closed. Electrical interconnections vary depending on the application.
ote:N The switchgear can be loop fed, single source fed, or multi-source fed. Users should become familiar with their
application, operating procedures and schematics provided with the equipment before switching.
The following sequence of operations shows the energized and de-energized state of the gear as each operation is
completed. Note the example Model 9-V3 assumes switchgear is fed from a single source. Source way (SW-1) shown only
for clarity. All other ways (VFI-1+) on the gear are considered VFI load ways and are not shown. The example assumes no
load side sources.
In this position, the vacuum interrupter and the visible
isolation rods are CLOSED. The grounding position is OPEN
and the isolation rod is energized. This example assumes all
ways are energized. See Figure 24.
LOAD BUS
SW-1
Source
VFI-1 VFI-2 VFI-3
Loads
Figure 23. MODEL 9-V3 Single Line Diagram
Isolation Rod
CLOSED
Ground
ROD
OPEN Load Bus
Source
SW-1
CLOSED
Figure 24. V3 style padmount – Source Way SW-1
CLOSED
In this position, the vacuum interrupter is OPEN and the
visible isolation rods are CLOSED. The grounding position
is OPEN and the isolation rod is energized only up to the
vacuum bottle contact. This example assumes all load ways
are de-energized since the source way breaker was opened
and the load bus is now de-energized. See Figure 25.
WARNING
The cables connected to all bushings, any control power
sources or stored energy devices such as capacitors
must be de-energized/discharged before gear is
considered de-energized. Isolation Rod
CLOSED
Ground
ROD
OPEN
Source
SW-1
OPEN
Load Bus
Figure 25. V3 style padmount – Source Way SW-1 OPEN

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15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
In this position the vacuum interrupter and the visible
isolation rods are OPEN. The grounding position is OPEN
and the visible isolation between the internal load bus and
the cable is achieved. See Figure 26.
WARNING
The ground rods will ground the cables connected to
the bushings on each associated way. Ensure there
is no voltage present before grounding.The cables
connected to all bushings, any control power sources
or stored energy devices such as capacitors must be
de-energized/discharged before gear is considered
de-energized.
Isolation Rod
OPEN
Ground
ROD
OPEN
Source
SW-1
OPEN
Load Bus
Figure 26. V3 style padmount – Isolation position Open
In this position, the vacuum interrupter and visible isolation
rods are OPEN. The grounding position is CLOSED. This
example assumes all ways are OPEN and internal load bus
is de-energized. See Figure 27.
WARNING
The ground rods will ground the cables connected to
the bushings on each associated way. Ensure there
is no voltage present before grounding.The cables
connected to all bushings, any control power sources
or stored energy devices such as capacitors must be
de-energized/discharged before gear is considered
de-energized.
Isolation Rod
OPEN
Ground
ROD
CLOSED
Source
SW-1
OPEN
Load Bus
Figure 27. V3 style padmount – Grounding position
CLOSED

13
15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
Sequence of operations – V3 Style Switchgear
Load way operation example
The following sequence of operations shows the energized and de-energized state of the gear as each operation is
completed. Note the example assumes switchgear is fed from a single source. Source way (SW-1) not shown is CLOSED. All
other ways on the gear (VFI-1+) are considered VFI load ways and are shown. Example assumes no load side sources and all
load ways are switched similarly.
In this position, the vacuum interrupter and visible isolation
rods are CLOSED. The grounding position is OPEN and the
isolation rod is energized. This example assumes all ways
are energized. See Figure 29.
WARNING
The cables connected to all bushings, any control power
sources or stored energy devices such as capacitors
must be de-energized/discharged before gear is
considered de-energized.
LOAD BUS
SW-1
Source
VFI-1 VFI-2 VFI-3
Loads
Figure 28. MODEL 9-V3 Single Line Diagram
Load Bus Isolation Rod
CLOSED
Ground
ROD
OPEN
Loads
VFI-1+
CLOSED
Figure 29. V3 style padmount – Source and load ways
CLOSED
In this position, the vacuum interrupter is OPEN and visible
isolation rods are CLOSED. The grounding position is OPEN
and the isolation rod is energized. This example assumes
all load ways (VFI-1+) are de- energized and there are no
load side sources. The source way SW-1 is closed. See
Figure 30.
WARNING
The cables connected to all bushings, any control power
sources or stored energy devices such as capacitors
must be de-energized/discharged before gear is
considered de-energized.
Load Bus Isolation Rod
CLOSED
Ground
ROD
OPEN
Loads
VFI-1+
OPEN
Figure 30. V3 style padmount – Source way CLOSED
and load ways OPEN

14
15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
In this position, the load way vacuum interrupters and
visible isolation rods are OPEN. The grounding position
is OPEN. This example assumes all load ways (VFI-1) are
de-energized and there are no load side sources. The source
way (SW-1) is closed. See Figure 31.
WARNING
The ground rods will ground the cables connected to
the bushings on each associated way. Ensure there
is no voltage present before grounding.The cables
connected to all bushings, any control power sources
or stored energy devices such as capacitors must be
de-energized/discharged before gear is considered
de-energized. Load Bus Isolation Rod
OPEN
Ground
ROD
OPEN
Load
VFI-1+
OPEN
Figure 31. V3 style padmount – Load ways and visible
isolation rods are OPEN
In this position, the load way vacuum interrupters and
visible isolation rods are OPEN. The grounding position is
CLOSED. This example assumes all load ways (VFI-1) are
de-energized and there are no load side sources. The source
way (SW-1) is closed. See Figure 32.
WARNING
The ground rods will ground the cables connected to
the bushings on each associated way. Ensure there
is no voltage present before grounding.The cables
connected to all bushings, any control power sources
or stored energy devices such as capacitors must be
de-energized/discharged before gear is considered
de-energized. Load Bus Isolation Rod
OPEN
Ground
ROD
CLOSED
Load
VFI-1+
OPEN
Figure 32. V3 style padmount – Source way CLOSED
and load side ground rods are CLOSED

15
15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
V3 Isolation and Grounding Interlock Scheme
Using the slip clutch tool provided with the switchgear
follow these steps:
1. Open the the vacuum interrupter and lock the breaker
in the OPEN position.
2. Remove the key from the interrupter and place in the
CON LOCK key slot.
3. Unlock the CON LOCK and rotate the isolation operator
counterclockwise (approximately 4 turns) until the
hard stop and the isolate status flag is aligned with
“ISOLATED (OPEN)”
WARNING
The VisoVac is now in the isolated (OPEN) position. The
ground rods will ground the cables connected to the
bushings on each associated way. Ensure there is no
voltage present before grounding. See “Sequence of
operations – V3 Style Switchgear” on page 11 in this
manual.
4. Lock the isolation rods in the ISOLATE (OPEN) position
using the ISO LOCK.
5. Remove the key from the ISO LOCK position and place
in the UN-GRD lock position.
6. Unlock the UN-GRD lock and rotate the ground operator
clockwise (approximately 4 turns) until the hard stop
and the mechanical indicator is aligned with GRD
(GROUNDED) status flag.
7. An optional GRD LOCK is available to lock the ground
rods in the grounded position.
Reverse this sequence to take the switchgear from the
GRD grounded position to the ISOLATE (OPEN) position and
then to the CONNECTED (CLOSE) position.
Flag Legend
Green - GRD (GROUNDED)
Yellow - UN-GRD (UNGROUNDED)
Orange - ISO ISOLATED (OPEN)
Red - CON CONNECTED (CLOSED)
See Figure 34
Slip clutch tool
(see Figure 15)
Key lock located on vacuum
interrupter (See Figure 10)
Figure 33. VisoVac Key Interlock Scheme
ISO LockGRD Lock
CON LockUN-GRD
Lock
Figure 34. VisoVac Key Interlock Label and Locks
Inspection and maintenance
In general, the VisoVac interrupter is maintenance free. The
vacuum interrupter has been tested for 10,000 mechanical
operations and should not require maintenance for a long
time as it is in a sealed environment without contaminants.
ISO/GRD mechanism is tested for 250 operations and does
not require any periodic maintenance.
It is recommended that the assembly be cycled at least
once per year. One cycle is defined below.
1. Open the vacuum interrupter.
2. Open the Isolation mechanism.
3. Close the Ground mechanism.

16
15kV Class Padmount VisoVac™
INSTRUCTION MANUAL MN024004EN April 2021
ote:N It may not be possible to complete steps 3 and
4 without de-energizing the upstream device. In
this case, step 3 and 4 can be skipped.
4. Open the Ground mechanism.
5. Close the Isolation mechanism.
6. Close the vacuum interrupter.
It is recommended not to remove any covers from the
VisoVac interrupter while the assembly is in service. If any
fasteners are loosened, the quality of the enclosure will be
compromised. If any repair is necessary, it is recommended
that the assembly be taken out of service and moved into
a controlled maintenance environment. If any cover is
removed for maintenance, new gasketing is required for
reassembly. The following list provides a list of cleaning,
testing and maintenance tasks for the vacuum interrupter
and related equipment.
● Operation of breakers: After step 1 above, clean VCPT as
per the linked manual.
https://www.eaton.com/content/dam/eaton/products/
electrical-circuit-protection/medium-voltage-vacuum-
circuit-breakers/mv-vcp-t-vacuum-circuit-breakers/vcp-t-
vcp-tr-instruction-book-ib131016en.pdf
● Heaters/thermostats: Heathers and thermostat shall be
cleaned after opening of interrupter.
● Dielectric testing: Once the unit has left the factory
and been placed in service, subsequent dielectric tests
performed during maintenance should be performed at
75% of the rating per IEEE recommendation.
● Follow these steps to perform the Pre-Startup inspection:
● Inspect the equipment visually.
● Make sure all connections are tightened and all covers
are closed before moving to next step.
● Make surroundings neat and clean to prevent trip-and-
fall injuries.
Safety features
There are several safety interlocks built into the VisoVac
assembly to ensure the proper sequence of operations.
1. Vacuum interrupter to Isolating mechanism interlock
(V3 designs only)
a. The vacuum interrupter is mechanically interlocked
with the Isolating mechanism.
b. The vacuum interrupter will not close unless the
isolating rods are in the fully connected position.
c. If a tool is placed on the isolating rod mechanism,
the vacuum interrupter will trip open before any
electrical contact is broken.
2. Isolation mechanism to ground mechanism
a. The isolating mechanism is mechanically
interlocked with the ground mechanism.
b. When the isolating rods are in the connected
position, the ground rods are blocked from moving
and remain blocked until the isolating rods are in
the fully open position.
c. When the ground rods are in the connected
position, the isolating rods are blocked from
moving and remain blocked until the ground rods
are in the fully open position.
3. Ground mechanism to upstream device
a. It is imperative that there be no voltage present on
the cable bushings before closing the ground rods.
b. Since this requires opening the upstream device
that may be blocks or even miles away, it is
recommended that the user deploy their Lock-out/
Tag-out and/or operational procedures to ensure no
voltage is present before closing the ground rods.
4. Arc reduction maintenance system (ARMS)
(Digitrip 1150V only)
a. When the Arcflash Reduction Maintenance System
is enabled, the internal digital logic is bypassed by
a “faster than instantaneous” analog trip circuit
based on user preset values. In this mode, the
Digitrip is set to hair trigger and issues subcycle
tripping. Total clear is estimated within 4 cycles.
b. Eaton’s Arcflash Reduction Maintenance System
technology is based on the realization that when
working on energized electrical equipment, a fault
that occurs within the gear or downstream needs
to be cleared as quickly as possible. While this
seems obvious, in actual installations, intentional
delays are included in upstream devices to ensure
selective coordination with downstream devices.
This means that if a fault were to occur inside the
equipment the downstream breaker may never
clear the fault regardless of how much delay is or
isn’t programmed in the upstream device. While
other Eaton Arcflash technologies are available, the
Arcflash Reduction Maintenance System comes
standard with the Digitrip 1150 V. This patented
technique provides “faster than instantaneous”
clearing times.
See the following link for literature on the Digitrip 1150V
ARMS functionality:
https://www.eaton.com/content/dam/eaton/products/
electrical-circuit-protection/medium-voltage-vacuum-circuit-
breakers/mv-vcp-t-vacuum-circuit-breakers/digitrip-1150v-
with-maintenance-mode-il66a7535.pdf