S&C VacuFuse Owner's manual

January 11, 2021
© S&C Electric Company 2019-2021, all rights reserved Instruction Sheet 465-500
VacuFuse®Self-Resetting Interrupter
Outdoor Distribution (5 kV, 15 kV, and 25 kV)
For Overhead Distribution
Transformer Protection
Installation and Operation
Table of Contents
Section Page Section Page
Introduction
Qualified Persons ........................... 2
Read this Instruction Sheet ................... 2
Retain this Instruction Sheet. . . . . . . . . . . . . . . . . . . 2
Video..................................... 2
Proper Application .......................... 3
Operating Considerations..................... 4
Warranty .................................. 4
Safety Information
Understanding Safety-Alert Messages........... 5
Following Safety Instructions .................. 5
Replacement Instructions and Labels ........... 5
Location of Safety Labels ..................... 6
Safety Precautions ......................... 7
Shipping and Handling
Inspection ................................. 8
Packing ................................... 8
Handling .................................. 8
Storage ................................... 8
Returning ................................. 8
Installation
Before Starting ............................. 9
Installing a VacuFuse Self-Resetting Interrupter
into the Cutout Mounting ...................10
Closing the VacuFuse Interrupter into
the Cutout Mounting.......................11
Operation
If the VacuFuse Self-Resetting Interrupter
is Found Open ...........................13
If Maintenance is to be Performed
on the Transformer........................13
Understanding the LED Indicators
and Position Indicator......................14
Opening and Closing the
VacuFuse Interrupter ......................15
Setting the MODE SELECTOR Lever. . . . . . . . . . . .16
Removing the VacuFuse Interrupter
from the Cutout Mounting...................18
Troubleshooting ........................... 20
Removing the VacuFuse Interrupter
from the Cutout Mounting Using
Loadbuster®—The S&C Loadbreak Tool .......21

2S&C Instruction Sheet 465-500
Introduction
Qualified Persons WARNING
Only qualified persons who are knowledgeable in the installation, operation, and
maintenance of distribution fusing equipment, along with all associated hazards,
may install, operate, and maintain the equipment covered by this publication. A
qualified person is someone who is trained and competent in:
• The skills and techniques necessary to distinguish exposed live parts from nonlive
parts of electrical equipment
• The skills and techniques necessary to determine the proper approach distances
corresponding to the voltages to which the qualified person will be exposed
• The proper use of special precautionary techniques, personal protective
equipment, insulating and shielding materials, and insulated tools for working on
or near exposed energized parts of electrical equipment
These instructions are intended ONLY for such qualified persons. They are
not intended to be a substitute for adequate training and experience in safety
procedures for this type of equipment.
Read this
Instruction Sheet NOTICE
Thoroughly and carefully read this instruction sheet before installing or
operating your VacuFuse Self-Resetting Interrupter. Familiarize yourself with
the Safety Information and Safety Precautions on pages 5 through 7. The latest
version of this publication is available online in PDF format at sandc.com/en/
support/product-literature/.
Retain this
Instruction Sheet
This instruction sheet is a permanent part of your VacuFuse Self-Resetting Interrupter.
Designate a location where you can easily retrieve and refer to this publication.
Video A video of the installation and operation procedures in this instruction sheet is available
at sandc.com/vacufuse-video. The goal of the video is to provide a clear and simple
visual reference. In no way is the video meant as a complete replacement of these written
instructions.

S&C Instruction Sheet 465-500 3
Introduction
Proper Application WARNING
The VacuFuse Self-Resetting Interrupter is only intended for the protection of
distribution transformers. The application must be within the ratings furnished for
the equipment. Ratings for the VacuFuse Self-Resetting Interrupter are listed in the
ratings table in Specification Bulletin 465-31. They are also etched on the body of
the interrupter.
The VacuFuse Self-Resetting Interrupter, selected for a specic application, should have
a maximum voltage rating equal to or greater than system line-to-line voltage when used
in phase-to-phase applications. The VacuFuse Self-Resetting Interrupter can be applied
on the primary side of 5-kV overhead distribution transformers up to 25 kVA, 15-kV
transformers up to 75 kVA, and 25-kV transformers up to 150 kVA when mounted in a
present-production 125- or 150-BIL cutout mounting. For the difference between present-
production and earlier-production cutout mountings, see Figures 1 and 2.
Figure 1. Present-production (“-R10” or “-R11”)
S&C-provided Type XS Fuse Cutout mounting.
Figure 2. Earlier-production (“-R9”) S&C
Type XS Fuse Cutout mounting. “-R8” and earlier
versions have a similar upper contact.

4S&C Instruction Sheet 465-500
Introduction
Operating
Considerations
The VacuFuse Self-Resetting Interrupter is factory-set with a fuse link TCC curve,
an open interval between the initial trip (TCC0) and the rst test (TCC1) of between
0.5 and 5 seconds, as well as the sequence reset time (between 30 seconds and 15 minutes).
The sequence of operation is as follows: the recloser will open once in response to
the fuse link curve (TCC0) and will have an open interval lasting a factory-programmed
number of seconds. Then, it will close, and the fuse-link curve will again become active
(TCC1). If the fault is still on the line, the VacuFuse Self-Resetting Interrupter will open
and lock open. If fault current is not still on the line, the Sequence Reset Timer will begin
timing. If another fault occurs during this time, the VacuFuse Self-Resetting Interrupter
will open and lock open. If this timer expires without the VacuFuse interrupter detecting
fault current, the VacuFuse interrupter will reset to TCC0.
The VacuFuse Self-Resetting Interrupter will operate on the fuse-link curve differently
depending on the position of the MODE SELECTOR lever. For more information, see the
“Setting the MODE SELECTOR Lever” section on page 16.
Warranty The warranty and/or obligations described in S&C’s Price Sheet 150 “Standard Conditions
of Sale–Immediate Purchasers in the United States” (or Price Sheet 153, “Standard
Conditions of Sale–Immediate Purchasers Outside the United States”), plus any special
warranty provisions, as set forth in the applicable product-line specication bulletin,
are exclusive. The remedies provided in the former for breach of these warranties shall
constitute the immediate purchaser’s or end user’s exclusive remedy and a fulllment of
the seller’s entire liability. In no event shall the seller’s liability to the immediate purchaser
or end user exceed the price of the specic product that gives rise to the immediate
purchaser’s or end user’s claim. All other warranties, whether express or implied or
arising by operation of law, course of dealing, usage of trade or otherwise, are excluded.
The only warranties are those stated in Price Sheet 150 (or Price Sheet 153), and THERE
ARE NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE. ANY EXPRESS WARRANTY OR OTHER OBLIGATION
PROVIDED IN PRICE SHEET 150 (OR PRICE SHEET 153) IS GRANTED ONLY TO THE
IMMEDIATE PURCHASER AND END USER, AS DEFINED THEREIN. OTHER THAN AN
END USER, NO REMOTE PURCHASER MAY RELY ON ANY AFFIRMATION OF FACT OR
PROMISE THAT RELATES TO THE GOODS DESCRIBED HEREIN, ANY DESCRIPTION
THAT RELATES TO THE GOODS, OR ANY REMEDIAL PROMISE INCLUDED IN PRICE
SHEET 150 (or PRICE SHEET 153).

S&C Instruction Sheet 465-500 5
Understanding
Safety-Alert
Messages
Several types of safety-alert messages may appear throughout this instruction sheet
and on labels and tags attached to the VacuFuse Self-Resetting Interrupter. Familiarize
yourself with these messages and the importance of these signal words:
DANGER
“DANGER” identifies the most serious and immediate hazards that will likely
result in serious personal injury or death if instructions, including recommended
precautions, are not followed.
WARNING
“WARNING” identifies hazards or unsafe practices that can result in serious
personal injury or death if instructions, including recommended precautions, are
not followed.
CAUTION
“CAUTION” identifies hazards or unsafe practices that can result in minor personal
injury if instructions, including recommended precautions, are not followed.
NOTICE
“NOTICE” identifies important procedures or requirements that can result in
product or property damage if instructions are not followed.
Following Safety
Instructions
If you do not understand any portion of this instruction sheet and need assistance, contact
your nearest S&C Sales Ofce or S&C Authorized Distributor. Their telephone numbers
are listed on S&C’s website sandc.com, or call the S&C Global Support and Monitoring
Center at 1-888-762-1100.
NOTICE
Read this instruction sheet thoroughly an carefully
before operating the VacuFuse Self-Resetting
Interrupter.
Replacement
Instructions
and Labels
If additional copies of this instruction sheet are needed, contact your nearest S&C
Sales Ofce, S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada
Ltd. The latest version is available online in PDF format at sandc.com/en/Support/
Product-Literature/.
It is important that any missing, damaged, or faded labels on the equipment be replaced
immediately. Replacement labels are available by contacting your nearest S&C Sales
Office, S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd
Safety Information

Safety Information
Location of Safety Labels
6S&C Instruction Sheet 465-500
Reorder Information for Safety Labels
Location Safety Alert Message Description Part Number
ADANGER VacuFuse®Self-Resetting Interrupter may be energized... G-9740
BFuse Link
TCC Curve (Label displaying the VacuFuse interrupter's protection curve.) ●
●Optional label. For more information, contact S&C Electric Company.
A
B

Safety Precautions
S&C Instruction Sheet 465-500 7
DANGER
The VacuFuse Self-Resetting Interrupter operates at high voltage.
Failure to observe the precautions below will result in serious personal injury
or death.
Some of these precautions may differ from your company’s operating procedures
and rules. Where a discrepancy exists, follow your company’s operating procedures
and rules.
1. QUALIFIED PERSONS. Access to the VacuFuse
Self-Resetting Interrupter must be restricted only to
qualified persons. See the “Qualified Persons” section
on page 2.
2. SAFETY PROCEDURES. Always follow safe
operating procedures and rules.
3. PERSONAL PROTECTIVE EQUIPMENT. Always
use suitable protective equipment, such as rubber
gloves, rubber mats, hard hats, safety glasses, and
flash clothing, in accordance with safe operating
procedures and rules.
4. SAFETY LABELS. Do not remove or obscure any of
the “DANGER,” “WARNING,” “CAUTION,” or
“NOTICE” labels and tags. Remove tags ONLY if
instructed to do so.
5. ENERGIZED COMPONENTS. Always consider all
parts live until de-energized, tested, and grounded.
6. OPERATING TOOLS. To close a VacuFuse Self-
Resetting Interrupter, use a conventional insulated
hotstick or an S&C Universal Pole and Pole Extension
fitted with a Talon™ Handling Tool or distribution
prong. An extendo-stick also can be used after proper
training and practice. When energized or installed
near energized lines, contacts should be considered
live until tested and grounded.
7. MAINTAINING PROPER CLEARANCE. Always
maintain proper clearance from energized
components.
8. DO NOT DISASSEMBLE the VacuFuse Self-
Resetting Interrupter. There are no customer-
serviceable parts inside the VacuFuse interrupter and
disassembling the VacuFuse interrupter will void the
warranty.

8 S&C Instruction Sheet 465-500
Shipping and Handling
Inspection
Examine the shipment for external evidence of damage as
soon after receipt as possible, preferably before removal
from the carrier’s conveyance. Check the bill of lading to
make sure the shipping skids, crates, and containers listed
are present. If there is visible loss or damage:
1. Notify the delivering carrier immediately.
2. Ask for a carrier inspection.
3. Note the condition of shipment on all copies of the
delivery receipt.
4. File a claim with the carrier.
If concealed damage is discovered:
1. Notify the delivering carrier within 15 days of receipt of
shipment.
2. Ask for a carrier inspection.
3. File a claim with the carrier.
Also, notify S&C Electric Company in all instances of
loss or damage.
Packing
A complete VacuFuse Self-Resetting Interrupter consists
of the following components:
• The VacuFuse Self-Resetting Interrupter
• A present-production “-R10” Type XS Cutout
Mounting and miscellaneous mounting hardware
for securing the VacuFuse Self-Resetting Interrupter
to the pole
Handling
NOTICE
DO NOT DROP the VacuFuse Self-Resetting
Interrupter or subject any of its parts to undue stress
during installation. Only remove a VacuFuse Self-
Resetting Interrupter from the carton immediately
before installation.
Storage
VacuFuse Self-Resetting Interrupters are shipped on
pallets banded with plastic wrap. This packaging is
designed to protect the VacuFuse interrupters from freight
damage. This packaging is not suitable for outdoor storage
as it can pool water and damage VacuFuse interrupters.
After receipt, VacuFuse interrupters should be stored
indoors in their shipping packaging. Storing VacuFuse
interrupters outdoors in the shipping packaging will void
the warranty.
Returning
When returning the VacuFuse Self-Resetting Interrupter
for any reason, place the VacuFuse interrupter in the
original shipping carton to prevent damage during
shipment. If additional shipping cartons are required,
contact the nearest S&C Sales Ofce, S&C Authorized
Distributor, or S&C Headquarters.

S&C Instruction Sheet 465-500 9
Installation
Before Starting
Familiarize yourself with the parts of the VacuFuse Self-
Resetting Interrupter. See Figure 3.
Figure 3. VacuFuse Self-Resetting Interrupter—Overview.
Hinge-end contact
Jaw-end contact
Trunnion
Pull-ring
Hand grip
MODE SELECTOR lever OPEN/CLOSE lever
Position
Indicator
LED
Indicators
Indicator

10 S&C Instruction Sheet 465-500
Installation
Installing a VacuFuse Self-Resetting
Interrupter into the Cutout Mounting
WARNING
Provide training to line crews on the use of both a
hotstick and an extendostick before installing or
operating the VacuFuse Self-Resetting Interrupter.
The VacuFuse interrupter is different from other
cutout-mounted devices. Failure to properly handle
a VacuFuse interrupter with a hotstick and/or an
extendostick may lead to serious injury or death.
STEP 1. If using an existing S&C cutout mounting
or other approved cutout mounting:Visually
inspect the cutout mounting for damage or
excessive wear, particularly in the upper and
lower contact areas. If ANY damage is visible,
replace the cutout mounting before proceeding.
DO NOT install and/or energize a VacuFuse
Self-Resetting Interrupter into a damaged
cutout mounting.
If installing in a new S&C cutout mount-
ing: For overhead pole-top style VacuFuse Self-
Resetting Interrupters, attach the mounting to
its mounting bracket, as illustrated in Figure 4.
A mounting bracket, suitable for crossarm, pole,
or wall mounting, is furnished only if specified
through the addition of catalog number suffix
“-B” or “-C” to the VacuFuse interrupter catalog
number.
Note the placement of the external-tooth
lockwasher between the mounting bracket and
the center insert of the mounting. Pivot the
mounting bracket to a position that will provide
maximum ease of operation, and then securely
tighten the carriage-bolt nut.
STEP 2. Make the electrical connections to the cutout
mounting. If aluminum conductors are used, be
sure to wire-brush them and apply a coating of
oxidation inhibitor before inserting them into
the connectors.
STEP 3. Installation Using Insulated Gloves: With
the OPEN/CLOSE lever in the Open position,
insert the VacuFuse Self-Resetting Interrupter
into a 125-kV BIL- or a 150-kV BIL-rated
mounting with gloved hands, as shown in
Figures 5 and 6. Guide the trunnion into the
hinge of the cutout mounting, as shown in
Figure 6.
Figure 6. Guiding the trunnion into the hinge of the cutout
mounting using gloved hands.
Figure 5. Bringing the trunnion close to the hinge of the
cutout mounting.
Carriage-bolt
Carriage bolt nut
Lockwasher
Mounting
bracket Overhead pole-
top mounting
center insert
External
tooth
lockwasher
Figure 4. Attaching an overhead pole-top style VacuFuse
interrupter cutout mounting to the mounting bracket.
Trunnion

S&C Instruction Sheet 465-500 11
Installation
Closing the VacuFuse Interrupter into the
Cutout Mounting
Special attention should be paid to how the VacuFuse Self-
Resetting Interrupter behaves when being closed.
When the MODE SELECTOR lever is in the Auto
(up) position: The behavior of the VacuFuse Self-Reset-
ting Interrupter when being closed into the cutout mount-
ing depends on the reason why the interrupter powered
down. If the previous power-down reason was because
the interrupter operated to the Locked Open position,
either because of a trip-to-lockout or a manual open, then
the VacuFuse Self-Resetting Interrupter will operate in
Non-Reclose (NR) mode for the first 10 seconds. If a fault
is not present on the line, after 10 seconds the VacuFuse
Self-Resetting Interrupter will revert to Auto mode. If a
fault is present in the first 10 seconds, the VacuFuse Self-
Resetting Interrupter will trip and lock out.
If the previous power-down reason was not because
of a Locked Open condition—for example, a power loss
when the unit was in Auto mode—the device will operate
in Auto mode. If a fault is present, the device will trip and
enter its test sequence.
When closing with the MODE SELECTOR lever
down: The VacuFuse Self-Resetting Interrupter will
operate in Non-Reclose mode until the MODE SELECTOR
lever is moved to the Auto (up) position. The active TCC
will be the instantaneous curve.
To close a VacuFuse Self-Resetting Interrupter into its
mounting:
STEP 1. Conrm the VacuFuse Self-Resetting
Interrupter is in the Open position by viewing
its Position indicator. See the “Understanding
the LED Indicators and Position Indicator”
section on page 14 for more information. Stand
rmly in front of and in line with the cutout
mounting. Do not operate standing directly
underneath the VacuFuse Self-Resetting
Interrupter. If using an extendostick, stand
from 6 to 10 feet (183 to 305 cm) away from the
pole.
STEP 2. Insert the straight prong of a Talon Handling
Tool or a distribution prong into the pull-ring.
STEP 3. Swing the VacuFuse interrupter to within
approximately 45 degrees of the fully Closed
position, as shown in Figure 7.
Figure 7. Swinging the VacuFuse interrupter to within
approximately 45 degrees of the fully Closed position.
45°

12 S&C Instruction Sheet 465-500
STEP 4. While rmly gripping the stick, drive the
VacuFuse Self-Resetting Interrupter closed
with forward force. Maintain the forward force
until the VacuFuse interrupter properly closes
and latches into the cutout mounting.
STEP 5. Disengage the prong from the pull-ring, taking
care to avoid pulling the VacuFuse interrupter
open.
STEP 6. Verify the MODE SELECTOR lever is in the
proper position for the application, either in
the Auto or NR mode. See Figure 8. See the
“Setting the MODE SELECTOR Lever” section
on page 16. Pull the OPEN/CLOSE lever down
to close the VacuFuse interrupter and energize
the transformer.
Figure 8. The MODE SELECTOR lever in the NR mode
position.
Installation

S&C Instruction Sheet 465-500 13
Operation
Figure 9. A VacuFuse Self-Resetting Interrupter in the Open
position.
If the VacuFuse Self-Resetting Interrupter is
Found Open
WARNING
Do not close the VacuFuse Self-Resetting Interrupter
found in the Open position using the OPEN/CLOSE
lever until the cause of the fault current has been
determined and repaired. The VacuFuse interrupter
is designed to protect distribution transformers from
internal and external fault current. Closing without
repairing the fault could result in equipment damage,
injury, or death.
After responding to an overcurrent event, in either the
Auto or the NR mode, the VacuFuse interrupter’s vacuum
interrupter will open and the Position indicator will
show a green target. Opening the vacuum interrupter
disconnects the VacuFuse interrupter’s sensing and
display functions from line power, and all LEDs will be
inoperative after one minute. See Figure 9.
Follow these steps if the VacuFuse Self-Resetting
Interrupter has operated and is in the Open position:
STEP 1. Remove the VacuFuse Self-Resetting
Interrupter from its mounting, if required by
utility practice, following the steps in the
“Removing the VacuFuse Interrupter from the
Cutout Mounting” section starting on page 18.
STEP 2. Determine and resolve the cause of the fault.
STEP 3. After the cause of the fault has been determined
and after any necessary repairs have been
completed, install the VacuFuse Self-Resetting
Interrupter to its mounting and close it into
the mounting following the steps in the
“Installation” section starting on page 9.
If Maintenance is to be Performed on the
Transformer
Follow these steps if maintenance is to be performed on
the transformer:
STEP 1. Open the vacuum interrupter inside the
VacuFuse Self-Resetting Interrupter by pushing
up on the OPEN/CLOSE lever rmly using the
straight prong of the Talon tool or a distribution
prong. See Figure 10.
Figure 10. Opening the VacuFuse interrupter by pushing up on
the OPEN/CLOSE lever.
OPEN/CLOSE lever

14 S&C Instruction Sheet 465-500
Operation
STEP 2. Remove the VacuFuse Self-Resetting
Interrupter from its mounting, if required,
following the steps in the “Removing the
VacuFuse Interrupter from the Cutout
Mounting” section starting on page 18. This
creates a visible “open gap” showing the
transformer is isolated from the feeder.
Depending on your utility’s standard practices,
additional grounds may be required.
STEP 3. Follow your utility’s standard practice for
performing transformer maintenance. After
any necessary maintenance or repairs have
been completed, install the VacuFuse Self-
Resetting Interrupter to its mounting and close
it into the mounting following the steps in the
“Installation” section starting on page 9.
Understanding the LED Indicators and
Position Indicator
LED Indicators
There are two LED indicators on the base of the VacuFuse
interrupter. See Figures 11 and 12.
The HEALTH INDICATOR LED is white and indicates
the “health” state of the VacuFuse interrupter. When the
VacuFuse interrupter is powered, the LED will flash white
at a 30-second interval to indicate a healthy condition.
If the VacuFuse interrupter is in an unhealthy state, the
white LED will “fast blink” at a one-second interval. If
the LED is off, that indicates the MODE SELECTOR lever
is down or the VacuFuse Self-Resetting Interrupter is no
longer powered.
The NR (Non-Reclose) LED is amber and will flash at
a 2-second interval when the VacuFuse interrupter is in
NR mode. See the “Setting the MODE SELECTOR Lever”
section on page 16 for more details about the modes. When
the VacuFuse interrupter is in the Auto mode, the amber
LED remains off.
NOTICE
At least 1.0 ampere of primary current must be flowing
through the VacuFuse Self-Resetting Interrupter to
power the control from its sleep state and illuminate
the HEALTH INDICATOR and NR LEDs. When
powered, the control will remain powered if the
transformer primary current does not fall below 1.0
ampere. If less than 1.0 ampere of primary current is
present, the VacuFuse Self-Resetting Interrupter will
still respond properly to fault current.
Figure 11. The HEALTH INDICATOR LED.
Figure 12. The NR (Non-Reclose) LED.
HEALTH
INDICATOR
LED
NR LED

S&C Instruction Sheet 465-500 15
Operation
Position Indicator
The POSITION indicator is located on the base of the
VacuFuse interrupter’s housing. It is a highly reective
visible red or green target that indicates the mechanical
position of the vacuum interrupter inside the VacuFuse
Self-Resetting Interrupter. The target is green when the
vacuum interrupter is in the Open position and red when
the vacuum interrupter is in the Closed position. See
Figures 13 and 14.
NOTICE
Catalog number option “-F1” reverses the colors of
the POSITION indicator to red for the Open position
and green for the Closed position. This option is
only available to Canadian utilities requiring reversed
colors on their system.
Do not refer to the position of the OPEN/CLOSE lever to
know the position of the vacuum interrupter. If the trans-
former is manually closed into fault current, the VacuFuse
interrupter will trip open in response, leaving the lever in
the Closed position when the vacuum interrupter is in
the Open position. Always observe the POSITION indica-
tor to know the position of the VacuFuse interrupter’s
vacuum interrupter.
Opening and Closing the VacuFuse
Interrupter
WARNING
Do not close the VacuFuse Self-Resetting Interrupter
found in the Open position using the OPEN/CLOSE
lever until the cause of the fault current has been
determined and repaired. The VacuFuse interrupter
is designed to protect distribution transformers from
internal and external fault current. Manual closing
without repairing the fault could result in equipment
damage, injury, or death.
The vacuum interrupter inside the VacuFuse Self-Resetting
Interrupter can be opened or closed using the yellow
OPEN/CLOSE lever on the side of the VacuFuse interrupter.
The VacuFuse Self-Resetting Interrupter will not “drop
out” of the cutout mounting when the vacuum interrupter
is in the Open position. It will remain upright in the cutout
mounting until manually removed.
To Open: Push the notched side of the yellow OPEN/
CLOSE lever up firmly using the straight prong of the Talon
tool or a distribution prong. The vacuum interrupter inside
the VacuFuse interrupter will open, and the POSITION
indicator will show the green target. See Figure 15.
Figure 13. The VacuFuse interrupter with the POSITION indicator
in the Open position.
Figure 14. The VacuFuse interrupter with POSITION indicator
in the Closed position.
Figure 15. Opening the VacuFuse interrupter by pushing up on
the OPEN/CLOSE lever.
Open
(Green)
POSITION
indicator
Closed
(Red)
POSITION
indicator
(Green)
Closed

16 S&C Instruction Sheet 465-500
Operation
To Close: Pull the pull-ring of the yellow OPEN/CLOSE
lever down firmly using the straight prong of the Talon
tool or a distribution prong. The vacuum interrupter inside
the VacuFuse interrupter will close, and the POSITION
indicator will show the red target. See Figure 16. If the
VacuFuse interrupter is inadvertently closed into a fault,
the vacuum interrupter will trip open independently of any
force still applied to OPEN/CLOSE lever.
To Reset the OPEN/CLOSE Lever After Manually
Closing into Fault Current: If the transformer is manu-
ally closed into fault current, the VacuFuse interrupter
will trip open in response, leaving the lever in the Closed
position when the vacuum interrupter is in the Open
position. The lever can be “reset” by operating it into the
Open position while the vacuum interrupter is in the
Open position.
Setting the MODE SELECTOR Lever
Before leaving the VacuFuse Self-Resetting Interrupter,
verify the MODE SELECTOR lever is in the desired
position. The MODE SELECTOR lever has two positions.
Figure 17 shows the MODE SELECTOR lever up in the
Auto mode position. Figure 18 on page 17 shows the
MODE SELECTOR lever down in the NR (non-reclose)
mode position.
Auto Mode—In the Auto mode, the VacuFuse inter-
rupter will respond to fault current according to its preset
TCC curve. The VacuFuse interrupter will perform one
reclosing operation (two trip operations total) to lockout.
The open interval between trip operations is user-specified
and factory set between 0.5 and 5 seconds.
The protection sequence reset time is a user-specified and
factory-set interval between 30 seconds and 15 minutes. If a
fault persists to the end of the protection sequence, the vac-
uum interrupter inside the VacuFuse interrupter will remain
in the Open/Lockout state until manually closed. The
VacuFuse Self-Resetting Interrupter will NOT drop out
of the mounting and will remain upright in the cutout
mounting.
The VacuFuse Self-Resetting Interrupter is in the Auto
mode when the curved label on the side of the VacuFuse
interrupter’s housing is fully covered and the label on the
bottom of the lever aligns with the label on the bottom
of the VacuFuse interrupter’s housing. See Figure 17 and
Figure 11 on page 14.
Figure 16. Closing the VacuFuse interrupter by pulling down on
the OPEN/CLOSE lever.
Figure 17. The MODE SELECTOR lever in the Auto mode
position.
MODE
SELECTOR
lever

S&C Instruction Sheet 465-500 17
Operation
NR (non-reclose) Mode—In the NR mode, the
VacuFuse Self-Resetting Interrupter will operate using the
“instantaneous” curve. The VacuFuse interrupter will lock
out and not attempt to reclose if a fault occurs while NR
mode is selected. The VacuFuse Self-Resetting Interrupter
is in the NR mode when the curved line is visible on the side
of the VacuFuse interrupter’s housing. The NR LED on the
base of the VacuFuse interrupter will blink at a 2-second
interval. See the “Understanding the LED Indicators and
Position Indicator” section on page 14. See Figure 18.
To place the MODE SELECTOR lever in the NR mode:
Rotate the MODE SELECTOR lever downward using the
straight prong of a Talon Handling Tool or a distribution
prong. See Figure 19. The lever will lock into the vertical
position.
To place the MODE SELECTOR lever in the Auto mode:
Rotate the MODE SELECTOR lever to the Up position
using the straight prong of a Talon Handling Tool or a
distribution prong. See Figure 20 on page 18. The lever
must completely cover the curved label on the housing of
the VacuFuse Self-Resetting Interrupter.
NOTICE
The MODE SELECTOR lever pictured in Figures 17
through 20 is shown with a tag clip. This tag clip can
be used to apply a tag to the equipment. A tag can
also be applied to the OPEN/CLOSE lever and to the
VacuFuse interrupter’s pull-ring when the VacuFuse
interrupter is in the “dropout” position. Tagging
in any of these places does not mechanically
lockout the equipment.
Figure 19. Rotating the MODE SELECTOR lever downward to
the NR mode position.
Figure 18. The MODE SELECTOR lever in the NR (non-reclose)
mode position.

18 S&C Instruction Sheet 465-500
Operation
Figure 20. Rotating the MODE SELECTOR lever upward to the
Auto mode position.
Removing the VacuFuse Interrupter from the
Cutout Mounting
WARNING
DO NOT attempt to remove a VacuFuse
Self-Resetting Interrupter from its cutout mounting
with the vacuum interrupter in the Closed position.
The vacuum interrupter is in the Closed position when
the POSITION indicator at the base of the VacuFuse
interrupter displays a red target. Removing the
VacuFuse interrupter from its cutout mounting with
the vacuum interrupter in the Closed position may
cause arcing, equipment damage, serious injury, or
death.
To remove the VacuFuse interrupter from its cutout
mounting:
STEP 1. Open the vacuum interrupter inside the
VacuFuse interrupter by pushing up on the
notch of the yellow OPEN/CLOSE lever.
Conrm the POSITION indicator at the base of
the VacuFuse interrupter displays a green
target.
STEP 2. Attach a Talon Handling Tool or a distribution
prong to a short hotstick. Using the straight
prong of the Talon tool or a distribution prong,
pull the pull-ring forward until the VacuFuse
interrupter disengages from the closed-into-
cutout position. A swift, rm pull will be
required.

S&C Instruction Sheet 465-500 19
Operation
STEP 3. Removal Using Insulated Gloves:Remove
the VacuFuse Self-Resetting Interrupter from a
125-kV BIL-rated or a 150-kV BIL-rated cutout
mounting with gloved hands as shown in
Figures 21 and 22.
Figure 21. Lifting the trunnion out of the hinge of the cutout
mounting using gloved hands.
Figure 22. Removing the VacuFuse interrupter.

20 S&C Instruction Sheet 465-500
Troubleshooting
Table 1. Troubleshooting
Condition Description Action
The vacuum interrupter is in the Closed (red
target) position and the white LED is fast-
blinking at one-second intervals.
The VacuFuse interrupter is in Abnormal
mode and may no longer be capable of
interrupting fault current.
Open the VacuFuse interrupter using
the OPEN/CLOSE lever. If the VacuFuse
interrupter will not open, bypass or
de-energize the VacuFuse interrupter
and remove it from its cutout mounting or
open and de-energize it using Loadbuster®—
The S&C Loadbreak Tool. Return the
VacuFuse interrupter to S&C Electric Company
for service.
The vacuum interrupter cannot be closed
using the VacuFuse interrupter’s OPEN/
CLOSE lever.
The VacuFuse interrupter is in Abnormal
mode.
Remove the VacuFuse interrupter from its
cutout mounting and return it to S&C Electric
Company for service.