S&C VacuFuse II User manual

January 24, 2022
© S&C Electric Company 2022, all rights reserved Instruction Sheet 466-500
VacuFuse®II Self-Resetting Interrupter
Outdoor Distribution (7.2 kV through 15 kV)
For Overhead Distribution Transformer
Protection
Installation
Table of Contents
Section Page Section Page
Introduction
Qualified Persons ........................... 2
Read this Instruction Sheet ................... 2
Retain this Instruction Sheet. . . . . . . . . . . . . . . . . . . 2
Proper Application .......................... 2
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 II Interrupter into the
Cutout Mounting..........................10
Closing the VacuFuse II Interrupter into the
Cutout Mounting..........................11
Understanding the Closing Sequence ...........12
Operation
If the VacuFuse II Self-Resetting Interrupter
Is Found Open ...........................13
If Maintenance Is to Be Performed on the
Transformer .............................14
Understanding the LED Indicators and
POSITION Indicator .......................15
Opening and Closing the VacuFuse II Interrupter ...16
Removing the VacuFuse II Interrupter
from the Cutout Mounting...................18
Troubleshooting
Removing the VacuFuse II Interrupter
from the Cutout Mounting Using
Loadbuster®—The S&C Loadbreak Tool ..... 20

2 S&C Instruction Sheet 466-500
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 a
VacuFuse II 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 II Self-Resetting Interrupter. Designate
a location where you can easily retrieve and refer to this publication.
Proper
Application WARNING
The VacuFuse II 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 II Self-Resetting Interrupter are listed in the ratings table in Specification
Bulletin 466-31. They are also etched on the body of the interrupter.

S&C Instruction Sheet 466-500 3
Introduction
The VacuFuse II 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 II Self-Resetting Interrupter can be applied on the primary
side of 7.2-kV overhead distribution transformers up to 150 kVA and on 15-kV transformers up to
250 kVA when mounted in a 110 or 125/150 kV-BIL cutout mounting. To ensure proper performance,
VacuFuse II interrupters must only be installed in present-production (“-R10” or “-R11”) S&C-provided
cutout mountings. See the example in Figure 1. An example of an earlier-production S&C cutout
mounting is shown in Figure 2.
Figure 1. A present-production (“-R10” or
“-R11”) S&C-provided Type XS Fuse Cutout
mounting.
Figure 2. An earlier-production (“-R9”) S&C
Type XS Fuse Cutout mounting. “-R8” and
earlier versions have a similar upper contact.

4 S&C Instruction Sheet 466-500
Introduction
Operating
Consider-
ations
For VacuFuse II Self-Resetting Interrupters with the Reclose feature: The VacuFuse II 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 a sequence reset time
(between 30 seconds and 15 minutes.)
The sequence of operation is as follows: The interrupter 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 II Self-Resetting Interrupter will lock open and drop
out. If fault current is not still on the line, the Sequence Reset Time timer will begin timing. If
another fault occurs during this time, the VacuFuse II Self-Resetting Interrupter will lock open
and drop out. If this timer expires without the VacuFuse II interrupter detecting fault current, the
VacuFuse II interrupter will reset to TCC0. Unless it has been specifically requested at the time of
order, TCC0 is the same curve as TCC1.
For VacuFuse II Self-Resetting Interrupters without the Reclose feature: The interrupter will
open and drop-out in response to a fault.
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 466-500 5
Safety Information
Understanding
Safety-Alert
Messages
Several types of safety-alert messages may appear throughout this instruction sheet and on labels
and tags attached to your S&C VacuFuse II 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 and carefully before
operating your VacuFuse II Self-Resetting Interrupter.
Replacement
Instructions
and Labels
If requiring additional copies of this instruction sheet, 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 avail-
able 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 immedi-
ately. 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
Location of Safety Labels
6 S&C Instruction Sheet 466-500
Reorder Information for Safety Labels
Location Safety Alert Message Description Part Number
A
WARNING A VacuFuse® II Self-Resetting Interrupter must be dropped out from the cutout
mounting to be considered OPEN and de-energized.
Device may be energized from either side…
G-9842
DANGER
BFuse Link
TCC Curve (Label displaying the VacuFuse II interrupter’s protection curve) ●
●Contact your nearest S&C Sales Office.
B
A

Safety Precautions
S&C Instruction Sheet 466-500 7
DANGER
The VacuFuse II 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 II
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 II Self-
Resetting Interrupter, use a conventional insulated
hotstick or S&C Universal Pole and Pole Extension
fitted with a Talon™ Handling Tool or distribution
prong. An extendostick 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. The
VacuFuse II interrupter can be operated using
Loadbuster®— The S&C Loadbreak Tool attached
to a conventional insulated hotstick or S&C
Universal Pole.
7. MAINTAINING PROPER CLEARANCE. Always
maintain proper clearance from energized
components.
8. DO NOT DISASSEMBLE the VacuFuse II Self-
Resetting Interrupter. There are no customer-
serviceable parts inside the VacuFuse II interrupter,
and disassembling the VacuFuse II interrupter will
void the warranty.

8 S&C Instruction Sheet 466-500
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 listed shipping skids, crates, and containers
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.
Packing
A complete VacuFuse II Self-Resetting Interrupter consists
of the following components:
• The VacuFuse II Self-Resetting Interrupter
• A current-production (“-R10”) Type XS Cutout Mount-
ing and miscellaneous mounting hardware for securing
the VacuFuse II Self-Resetting Interrupter to the pole
Handling
NOTICE
DO NOT DROP the VacuFuse II Self-Resetting
Interrupter or subject any of its parts to undue stress
during installation. Only remove a VacuFuse II Self-
Resetting Interrupter from the carton immediately
before installation.
Storage
VacuFuse II Self-Resetting Interrupters are shipped
on pallets banded with plastic wrap. This packaging is
designed to protect the VacuFuse II interrupters from
freight damage. This packaging is not suitable for outdoor
storage because it can pool water and damage VacuFuse
II interrupters. After receipt, VacuFuse II interrupters
should be stored indoors in their shipping packaging.
Storing VacuFuse II interrupters outdoors in the shipping
packaging will void the warranty.
Returning
When returning the VacuFuse II Self-Resetting Interrupter
for any reason, place the VacuFuse II 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 466-500 9
Before Starting
Familiarize yourself with the parts of the VacuFuse II
Self-Resetting Interrupter. See Figure 3.
Figure 3. An overview of the VacuFuse II Self-Resetting Interrupter.
POSITION indicator
CHARGING LED
OPEN/CLOSE
lever
Hinge-end contact
Jaw-end contact
Pull-ring
Installation
Trunnion
READY TO CLOSE LED

10 S&C Instruction Sheet 466-500
Installation
Installing a VacuFuse II 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 II Self-Resetting Interrupter.
The VacuFuse II interrupter is different from other
cutout-mounted devices. Failure to properly handle
a VacuFuse II interrupter with a hotstick and/or an
extendostick may lead to serious injury or death.
Complete the following steps to install a VacuFuse II
interrupter into a cutout mounting:
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 II
Self-Resetting Interrupter into a damaged
cutout mounting.
If installing in a new S&C Cutout
Mounting:For overhead pole-top style
VacuFuse II Self-Resetting Interrupters, attach
the mounting to its mounting bracket, as illus-
trated in Figure 4. A mounting bracket, suitable
for crossarm, pole, or wall mounting, is fur-
nished only if specified through the addition
of catalog number suffix “-B” or “-C” to the
VacuFuse II 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.
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 II
interrupter cutout mounting to the mounting bracket.

S&C Instruction Sheet 466-500 11
Installation
Figure 5. Guiding the trunnion into the hinge of the cutout
mounting using gloved hands.
Trunnion
STEP 3. Installation Using Insulated Gloves: With
the OPEN/CLOSE lever in the Open position,
insert the VacuFuse II Self-Resetting
Interrupter into a 110-kV BIL or a 125/150-kV
BIL-rated mounting with gloved hands, as
shown in Figure 5.
Closing the VacuFuse II Interrupter into the
Cutout Mounting
Complete the following steps to close a VacuFuse II Self-
Resetting Interrupter into its mounting:
NOTICE
Read the “Understanding the Closing Sequence”
section on page 12 before closing the VacuFuse II
Self-Resetting Interrupter into its cutout mounting.
STEP 1. Conrm the VacuFuse II 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 15 for more information. Place
the OPEN/CLOSE lever in the correct position
for the closing sequence desired. See the
“Understanding the Closing Sequence” section
on page 12.
STEP 2. Stand rmly in front of and in line with the
cutout mounting. Do not operate standing
directly underneath the VacuFuse II Self-
Resetting Interrupter. If using an extendostick,
stand from 6 to 10 feet (183 to 305 cm) away
from the pole.
STEP 3. Insert the straight prong of an Talon™ Handling
Tool or a distribution prong into the pull-ring.
STEP 4. Swing the VacuFuse II interrupter to within
approximately 45 degrees of the fully Closed
position, as shown in Figure 6.
STEP 5. While rmly gripping the stick, drive the
VacuFuse II Self-Resetting Interrupter closed
with forward force. Maintain the forward force
until the interrupter properly closes and latches
into the cutout mounting.
STEP 6. Disengage the prong from the pull-ring, taking
care to avoid pulling the VacuFuse II interrupter
open.
Figure 6. A VacuFuse II interrupter within approximately
45 degrees of the fully Closed position.
45°

12 S&C Instruction Sheet 466-500
Installation
Understanding the Closing Sequence
Note: The VacuFuse II Self-Resetting Interrupter is
shipped from the factory with the vacuum interrupter in
the Open position.
When closing the VacuFuse II Self-Resetting Interrupter
into the cutout mounting, the CHARGING LED will blink
at a 1-second interval as long as there is voltage available
at the cutout and the vacuum interrupter is OPEN.
The READY TO CLOSE LED will steadily illuminate
when the VacuFuse II Self-Resetting Interrupter has har-
vested enough energy to close the vacuum interrupter.
The VacuFuse II Self-Resetting Interrupter requires
45 ± 10 seconds to harvest enough energy to close the
vacuum interrupter.
There are two ways to close the vacuum interrupter:
Option 1 – Automatic Delay Close
Place the OPEN/CLOSE lever into the Closed (up) position
at any time (before or after mounting the unit into the
cutout mounting). When closed into the cutout mounting,
the CHARGING LED will blink at a 1-second interval as
long as there is voltage available at the cutout and the
vacuum interrupter is open. The unit will automatically
close the vacuum interrupter after 45 ± 10 seconds.
Option 2 – Manual Close
Place the OPEN/CLOSE lever into the Open (dow n) posit ion
before mounting the unit into the cutout mounting or at
any time before the READY TO CLOSE LED illuminates.
For an intentional close on a precise timing, wait until
the READY TO CLOSE LED is solidly lit. At that time, the
unit is ready to be closed manually by moving the OPEN/
CLOSE lever to the Closed position. Three seconds after
the lever is moved to the Closed position, the vacuum
interrupter will close.

S&C Instruction Sheet 466-500 13
Operation
If the VacuFuse II Self-Resetting Interrupter Is
Found Open
WARNING
The VacuFuse II Self-Resetting Interrupter is designed
to protect distribution transformers from internal and
external fault current. A VacuFuse II Self-Resetting
Interrupter found in the Open and Drop Out position
should not be closed using the OPEN/CLOSE lever
until the cause of the fault current has been determined
and repaired. Closing without repairing the fault could
result in equipment damage, injury, or death.
After responding to an overcurrent event, the VacuFuse
II interrupter’s vacuum interrupter will open and the
POSITION indicator will show a green target. If the over-
current event persists after the reclosing event, the unit
will lock out and drop out from the cutout mounting.
Follow these steps if the VacuFuse II Self-Resetting
Interrupter has operated and is in the Open and Drop
Out position:
STEP 1. Remove the VacuFuse II Self-Resetting
Interrupter from its mounting, if required by
utility practice, following the steps in the
“Removing the VacuFuse II 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 II Self-
Resetting Interrupter and close it into the
mounting following the steps described in the
“Installation” section starting on page 9.

14 S&C Instruction Sheet 466-500
Operation
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 II Self-Resetting Interrupter by
pulling down on the OPEN/CLOSE lever rmly
using the straight prong of the Talon tool or a
distribution prong. See Figure 7.
STEP 2. Remove the VacuFuse II Self-Resetting
Interrupter from its mounting after the
interrupter opens and drops-out. If required by
utilitypractice,followthestepsinthe“Removing
the VacuFuse II 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 II
Self-Resetting Interrupter and close it into the
mounting following the steps described in the
“Installation” section starting on page 9. Figure 7. The OPEN/CLOSE lever in the Closed position.
OPEN/CLOSE
lever

S&C Instruction Sheet 466-500 15
Operation
Understanding the LED Indicators and
POSITION Indicator
LED Indicators
Two LEDs are on the base of the VacuFuse II interrupter.
See Figure 8.
The CHARGING LED is white and indicates the
VacuFuse II interrupter is harvesting energy to close the
vacuum interrupter. When the VacuFuse II interrupter
is powered, the CHARGING LED will start flashing at
one flash per second as long as voltage is in the cutout
mounting and the vacuum interrupter is open. When full
charge is achieved, the CHARGING LED will continue
flashing, the READY TO CLOSE LED will illuminate, and
the CHARGING LED will keep blinking.
NOTICE
At least 3.5 amperes of primary current must be
flowing through the VacuFuse II Self-Resetting
Interrupter to power the control from its Sleep state.
When powered, the control will remain powered if
the transformer primary current does not fall below
3.5 amperes. If less than 3.5 amperes of primary
current are present, the VacuFuse II Self-Resetting
Interrupter will still respond properly to fault current.
POSITION Indicator
The POSITION indicator is located on the base of the
VacuFuse II 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 II
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
Figure 9 and Figure 10 on page 16. POSITION indicator
in the Open (green)
position
Figure 9. The vacuum interrupter in the Open position.
CHARGING
LED
Figure 8. The LEDs on the base of the VacuFuse II
interrupter.
READY TO
CLOSE LED

16 S&C Instruction Sheet 466-500
POSITION
indicator in the
Closed (Red)
position
Figure 10. The vacuum interrupter in the Closed position.
NOTICE
Catalog number option “-J1” 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 that require reversed
colors on their system.
Do not refer to the position of the OPEN/CLOSE lever
to know the position of the vacuum interrupter. When the
VacuFuse II interrupter trips in response to a fault, the lever
does not move, leaving the lever in the Closed position when
the vacuum interrupter is in the Open position. Always
observe the POSITION indicator to know the position of the
VacuFuse II interrupter’s vacuum interrupter.
Opening and Closing the VacuFuse II
Interrupter
WARNING
The VacuFuse II Self-Resetting Interrupter is designed
to protect distribution transformers from internal and
external fault current. A VacuFuse II interrupter found
in the Open and Drop Out position (POSITION
indicator displaying a green target) should NOT be
manually closed until the cause of the trip operation
has been determined and repaired. Manual closing
without repairing the fault could result in equipment
damage, injury, or death.
The vacuum interrupter inside the VacuFuse II Self-
Resetting Interrupter can be opened using the yellow
OPEN/CLOSE lever on the side of the VacuFuse II inter-
rupter, with or without power. The interrupter must be
powered for at least 45 seconds before the vacuum inter-
rupter can be closed by moving the lever to the Closed
position.
The VacuFuse II Self-Resetting Interrupter will “drop
out” of the cutout mounting after one minute when the
vacuum interrupter is in the Open position and the unit
has locked open.
Operation

S&C Instruction Sheet 466-500 17
OPEN/CLOSE lever
Figure 12. Operating the OPEN/CLOSE lever into the
Closed position.
To Open: Pull the yellow OPEN/CLOSE lever down
firmly using the straight prong of the Talon tool or a dis-
tribution prong. Remove the tool right away. The vacuum
interrupter inside the VacuFuse II interrupter will open,
and the POSITION indicator will show the green target.
After one minute of the vacuum interrupter in the Open
position, the unit will drop out. See Figure 11.
To Close: Push the pull-ring 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 II interrupter will close after 45 seconds of the
unit being powered, and the POSITION indicator will show
the red target. See Figure 12. If the VacuFuse II 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: When the
VacuFuse II interrupter trips in response to a fault,
the lever does not move, 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. When the lever is in the Closed position,
the interrupter will automatically close the next time it is
pushed into the cutout mounting and synchronize itself.
Note: After a permanent fault occurs, it is necessary to
wait at least 20 seconds before closing the interrupter into
the cutout mounting again. If the interrupter is closed into
the cutout mounting immediately after a permanent fault,
it will drop-out without closing. This happens due to the
interrupter interpreting that it never dropped-out from the
cutout mounting after the permanent fault.
Operation
Figure 11. Operating the OPEN/CLOSE lever into the Open
position.
OPEN/CLOSE lever

18 S&C Instruction Sheet 466-500
Operation
Removing the VacuFuse II Interrupter from
the Cutout Mounting
WARNING
DO NOT attempt to remove a VacuFuse II 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
II interrupter displays a red target. Removing the
VacuFuse II interrupter from its cutout mounting with
the vacuum interrupter in the Closed position may
cause arcing, equipment damage, serious injury, or
death.
Complete the following steps to remove the VacuFuse II
interrupter from its cutout mounting:
STEP 1. Open the vacuum interrupter inside the
VacuFuse II interrupter by pulling down on the
yellow OPEN/CLOSE lever. Conrm the
POSITION indicator at the base of the
VacuFuse II interrupter displays a green target.
STEP 2. Wait one minute until the VacuFuse II Self-
Resetting Interrupter drops out.
If the VacuFuse II Self-Resetting Interrupter
stays in its cutout mounting, confirm
the POSITION indicator at the base of the
VacuFuse II interrupter displays a green target.
Use the troubleshooting guide on page 20 to
determine the cause of the unit not dropping out.
In this case, the VacuFuse II Self-Resetting
Interrupter may not have energy to drop out,
may be stuck in the cutout mounting, or it is in
Abnormal mode.
If the VacuFuse II self-resetting interrupter
does not have enough power to drop out, it will
show the CHARGING LED blinking when power
is present in the cutout mounting. After one
minute of receiving power, the unit will drop out.
If the VacuFuse II self-resetting interrupter
is stuck in the cutout mounting, the unit will
show the CHARGING LED blinking. The
VacuFuse II self-resetting interrupter will
repeatedly attempt to drop out. If it does not
successfully drop out within 8 hours, the unit
will go into an End-of-Life state.

S&C Instruction Sheet 466-500 19
Operation
Figure 13. Removing the VacuFuse II interrupter with
gloved hands.
To prevent premature end of life, 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 II inter-
rupter disengages from the Closed into Cutout
position. A swift, firm pull will be required.
If the VacuFuse II self-resetting interrupter
is stuck in the cutout mounting in Abnormal
mode, it is necessary to check for voltage
presence in the cutout mounting.
If voltage is present in the cutout mounting
and the CHARGING LED is not blinking,
Abnormal mode is confirmed.
Remove the VacuFuse II self-resetting
interrupter from its cutout mounting using
Loadbuster®—The S&C Loadbreak Tool.
Then, re-install the VacuFuse II interrupter as
described in the “Installation” section starting
on page 9.
If there is no voltage present in the cutout
mounting, wait for power to be restored in the
cutout mounting and test again for any of the
three possible conditions.
If the VacuFuse II Self-Resetting Interrupter
is in its cutout mounting with the vacuum inter-
rupter in the Closed position and operating the
OPEN/CLOSE lever to the Open position does
not work, or the VacuFuse II interrupter is to
be removed from its cutout mounting in the
Closed position for any other reason, follow
the instructions in the “Removing the VacuFuse
II Interrupter from the Cutout Mounting using
Loadbuster®—The S&C Loadbreak Tool”
section on page 20.
STEP 3. Remove the VacuFuse II Self-Resetting
Interrupter from a 110-kV BIL-rated or a 125/
150-kV BIL-rated cutout mounting with gloved
hands as shown in Figure 13.

20 S&C Instruction Sheet 466-500
Troubleshooting
Table 1.
Condition Description Action
The VacuFuse II interrupter’s vacuum
interrupter is in the Open position, and
the VacuFuse II interrupter is dropped out
and cannot be closed back into the cutout
mounting.
The VacuFuse II interrupter has reached the
end of its life.
Remove the VacuFuse II interrupter from the cutout
mounting and return it to S&C Electric Company
for service.
The vacuum interrupter cannot be closed
using the VacuFuse II interrupter’s OPEN/
CLOSE lever.
The VacuFuse II interrupter is in Abnormal
mode.
Remove the VacuFuse II interrupter from its cutout
mounting and return it to S&C Electric Company
for service.
The vacuum interrupter is in the Open
position, but the VacuFuse II interrupter
has not dropped out of the cutout
mounting.
Situation 1
The VacuFuse II Self-Resetting Interrupter
does not have enough power to drop out. The
CHARGING LED blinks with the presence of
voltage in the cutout mounting.
Situation 1 Action
Wait 1 minute after receiving power and the unit
will drop out by itself.
Situation 2
The VacuFuse II Self-Resetting Interrupter is
stuck in the cutout mounting. The CHARGING
LED blinks with the presence of voltage in the
cutout but after 1 minute the unit does not drop
out. The VacuFuse II Self-Resetting Interrupter
will repeatedly attempt to drop out. If it does
not successfully drop out within 8 hours, the
unit will go into an End-of-Life state.
Situation 2 Action
To prevent premature end of life, 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 II interrupter disengages from
the Closed into Cutout position. A swift, firm pull
will be required.
Situation 3
The VacuFuse II Self-Resetting Interrupter
is stuck in the cutout mounting in Abnormal
mode
Situation 3 Action
Check for voltage presence in the cutout mounting.
If voltage is present in the cutout mounting, and
the CHARGING LED is not blinking, Abnormal
mode is confirmed. Remove the VacuFuse
II interrupter from its cutout mounting using
Loadbuster®—The S&C Loadbreak Tool. Then,
install a new VacuFuse II interrupter as described
in the “Installation” section starting on page 9.
If there is no voltage present in the cutout
mounting, wait for power to be restored in the
cutout mounting and test again for any of the three
possible situation conditions.
Removing the VacuFuse II Interrupter from
the Cutout Mounting Using Loadbuster®—
The S&C Loadbreak Tool
If the VacuFuse II Self-Resetting Interrupter is in its cutout
mounting with the vacuum interrupter in the Closed
position and operating the OPEN/CLOSE lever to the Open
position does not work, or the VacuFuse II interrupter is
to be removed from its cutout mounting in the Closed
position for any other reason, it may be safely removed
using S&C’s Loadbuster tool. Following an opening opera-
tion with the Loadbuster tool, the VacuFuse II interrupter
can be lifted out of the mounting with gloved hands.
WARNING
DO NOT attempt to open a VacuFuse II Self-Resetting
Interrupter that is in the Closed position without using
a loadbreak tool such as S&C’s Loadbuster tool. An
arc started by opening a VacuFuse II Self-Resetting
Interrupter under load without a loadbreak tool can
cause equipment damage, serious injury, or death.
WARNING
DO NOT attempt to use a Loadbuster tool to open a
VacuFuse II Self-Resetting Interrupter while climbing
the pole. Engagement of a Loadbuster tool in this
position is difficult and may result in improper opening
operation, leading to arcing, faults, equipment
damage, serious injury, or death.