S&C Fault Tamer Owner's manual

S&C Fault Tamer®Fuse Limiter
Outdoor Distribution (15 kV through 34.5 kV)
For Overhead Pole-Top Transformers
July 29, 2019
© S&C Electric Company 1995-2019, all rights reserved Instruction Sheet 451-500
Installation and Operation
Table of Contents
Section Page Section Page
Introduction
Qualified Persons ........................... 2
Read this Instruction Sheet ................... 2
Retain this Instruction Sheet. . . . . . . . . . . . . . . . . . . 2
Proper Application .......................... 2
Warranty .................................. 2
Safety Information
Understanding Safety-Alert Messages........... 3
Following Safety Instructions .................. 3
Replacement Instructions and Labels ........... 3
Safety Precautions ......................... 4
Shipping and Handling
Inspection ................................. 5
Installing the Fault Tamer Fuse Limiter
Mounting ................................. 6
Fusing ..................................... 7
Re-Fusing .................................. 9
Installing and Closing a Fault Tamer Fuse
Limiter.................................. 10
Opening a Fault Tamer Fuse Limiter......... 11
Operating with Loadbuster®—The S&C
Loadbreak Tool.......................... 12

2S&C Instruction Sheet 451-500
Introduction
Qualified Persons WARNING
Only qualified persons who are knowledgeable in the installation, operation, and
maintenance of overhead and underground electric distribution 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, insulated 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 and all materials included in the
product’s S&C Instruction Handbook before installing or operating your S&C Fault
Tamer Fuse Limiter. Familiarize yourself with the Safety Information and Safety
Precautions on pages 3 and 4. 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 S&C Fault Tamer Fuse Limiter.
Designate a location where you can easily retrieve and refer to this publication.
Proper Application WARNING
The equipment in this publication is only intended for a specific application. The
application must be within the ratings furnished for the equipment. Ratings for the
Fault Tamer Fuse Limiter are listed in the ratings table in Specification Bulletin
451-31. The ratings are also listed on the product.
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 451-500 3
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 Fault Tamer Fuse Limiter. Familiarize yourself
with these types of messages and the importance of these various 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 Monitoring and Support
Center at 1-888-762-1100.
NOTICE
Read this instruction sheet thoroughly and carefully
before installing your S&C Fault Tamer Fuse Limiter.
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.
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.

4S&C Instruction Sheet 451-500
Safety Precautions
DANGER
Fault Tamer Fuse Limiters operate 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
Fault Tamer Fuse Limiter 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 AND TAGS. Do not remove or
obscure any of the “DANGER,” “WARNING,”
“CAUTION,” or “NOTICE” labels. Remove tags
ONLY if instructed to do so.
5. ENERGIZED COMPONENTS. Always consider all
parts live until de-energized, tested, and grounded.
6. MAINTAINING PROPER CLEARANCE. Always
maintain proper clearance from energized
components.
7. OPERATION. Do not attempt to open an S&C Fault
Tamer Fuse Limiter to interrupt load current without
the use of a loadbreak tool such as Loadbuster®—
The S&C Loadbreak Tool. S&C Fault Tamer Fuse
Limiters are designed to protect equipment and to
disconnect faulted equipment from the system.
Fault Tamer Fuse Limiters cannot protect personnel
from injury or electrocution if contact is made with
energized circuits or hardware.

S&C Instruction Sheet 451-500 5
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 and/or damage:
1. Notify the delivering carrier immediately.
2. Ask for a carrier inspection.
3. Note 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 and/or damage.
Shipping and Handling

6S&C Instruction Sheet 451-500
Complete the following steps to install the mounting for
the Fault Tamer Fuse Limiter.
STEP 1. Attach the Fault Tamer Fuse Limiter mounting
to a suitable mounting bracket, as illustrated in
Figure 1. Note: A mounting bracket suitable for
crossarm, pole, or wall mounting is furnished
only if it has been specied through the addition
of sufx “-B” or “-C” to the catalog number of the
Fault Tamer Fuse Limiter. Tighten the carriage
bolt nut until snug but still loose enough to
permit pivot adjustment. Note the placement of
the external-tooth lockwasher between the
Fault Tamer Fuse Limiter center insert and the
mounting bracket.
STEP 2. Pivot the Fault Tamer Fuse Limiter mounting to
a position that will provide maximum ease of
operation and then securely tighten the carriage
bolt nut.
STEP 3. Make electrical connections. When using
aluminum conductors, be sure to wire-brush
them and apply a coating of oxidation inhibitor
before inserting them into the mounting’s
connectors.
Figure 1. Detail of attachment of the Fault Tamer Fuse Limiter
mounting to the mounting bracket.
External tooth
lockwasher
Carriage bolt nut
Lockwasher
Mounting bracket
Fault Tamer
center insert
Carriage bolt
Installing the Fault Tamer Fuse Limiter Mounting

S&C Instruction Sheet 451-500 7
Fusing
Complete the following steps to install a new Fault Tamer
Fuse Limiter:
STEP 1. Unscrew the fuse-tube cap from the fuse tube
and remove the spring-and-cable assembly.
STEP 2. Screw a new fuse cartridge into the lower end of
the spring-and-cable assembly. Hand-tighten
until the thread bottoms out.
STEP 3. Rotate the red-beaded pull tab until it is
extended in line with the fuse cartridge, as
showninFigure2, andinserttheentireassembly
(fuse cartridge and spring-and-cable assembly)
into the fuse tube. Then, screw the fuse-tube
cap on the fuse-tube upper ferrule and tighten
securely with pliers.
Figure 2. Fault Tamer Backup Limiter, Fuse Tube, and Fuse Cartridge.
Upper ferrule
Fuse-tube
cap
Spring-
and-cable
assembly
Fuse
cartridge
Red-beaded
pull tab
Collar
nut
Alignment
keys
Backup
limiter
Trunnion
Exhaust-control section
Backup
Lockwasher
5/16 –18 hex nut
Threaded
stud
Detail B
Notches
Bottom View
Top View
Detail A
Detail C
Extension
adapter
Collar
Collar
nut

8S&C Instruction Sheet 451-500
Fusing
STEP 4. Carefully pull on the red-beaded pull tab to pull
the fuse cartridge through the fuse tube, against
spring tension, until the contact ngers expand
into the ring contact on the fuse tube. See
Figure 3 (top).
Avoid jerking and excessive overtravel. Slowly
release the red-beaded pull tab, permitting the
contact fingers to rest on the ring contact. See
Figure 3 (bottom). Remove the red-beaded pull
tab as shown in Figure 4.
CAUTION
Do not break off red-beaded pull tab. The
contact fingers may separate from the ring
contact, allowing the fuse cartridge to pull
back into the fuse tube. The proper way to
remove the red-beaded pull tab is shown in
Figure 4.
STEP 5. Align the keys on the fuse tube with the notches
in the exhaust-control section of the backup
limiter. See Figure 2, Details A and B on page 7.
Insert the fuse tube into the exhaust-control
section and hand-tighten the collar nut.
WARNING
The alignment keys in the fuse tube and the
notches in the exhaust control section of the
backup limiter are intended to guard against
inadvertent use of fuse tubes applicable to
one system voltage with backup limiters
applicable to a different system voltage. Do
not defeat the alignment keys or notches or
force together a fuse tube with a backup limiter
it is not designed to work with. Misapplying
Fault Tamer Fuse Limiter components
can result in arcing, equipment damage,
serious injury, or death.
STEP 6. Attach the trunnion to the threaded stud on the
backup limiter with the lockwasher and
5/16 –18 hex nut, provided. See Figure 2 on page 7.
For over-insulated Fault Tamer Fuse
Limiters with extension adapter: Remove the
trunnion from the backup limiter, if installed.
Save the hardware. Attach the extension
adapter to the threaded stud on the backup
limiter with the lockwasher and 5/16–18 hex nut
provided. Then, attach the trunnion to the
extension adapter with the 5/16 —18 x ⅞ hex-head
cap screw, lockwasher, and 5/16–18 hex nut pro-
vided. See Figure 2 Detail C.
NOTICE
Do not over tighten 5/16 –18 hex nut
(10 ft. lbs. max). Damage to the backup limiter
may result if the hex nut is overtightened.
Figure 3. Installation of Fault Tamer Fuse Limiter Cartridge.
Fuse
cartridge
⅛ -inch (3 mm)
approximately
Fuse tube
Ring contact
Contact
fingers
Maximum Pull-Through Position
Drop-Back Position
Red-beaded
pull tab
Figure 4. The proper way to remove the red-beaded pull tab.

S&C Instruction Sheet 451-500 9
Re-Fusing
Complete the following steps when re-fusing a Fault Tamer
Fuse Limiter.
STEP 1. When a Fault Tamer Fuse Limiter operates, it
swings to the Open position. Remove it from the
mounting using a universal pole and a suitable
fuse-handling tting, such as an S&C Talon™
Handling Tool or a distribution prong. See
Figure 6 on page 10.
CAUTION
As with any current-limiting fuse, when a
backup limiter operates, it can become hot
enough to cause burns. Wear gloves and
handle the Fault Tamer Fuse Limiter by
the fuse tube to avoid possible burn
hazard.
STEP 2. Unscrew the collar nut and remove the fuse tube
from the backup limiter.
STEP 3. Determine whether the backup limiter has
operated by checking its continuity. Touch one
lead of the continuity tester to the trunnion and
the other to the button contact inside the
exhaust-control device. See Figure 5.
WARNING
Failure to check the backup limiter for
continuity can return a limiter to service
that has already operated. This can result
in personal injury, fire, or equipment or
property damage.
If the backup limiter does not have continuity,
remove the trunnion so it can be reused, and then
discard the backup limiter. If the backup limiter
does have continuity, it can be reused—but
first, remove any debris that might be inside the
exhaust-control section of the backup limiter.
WARNING
Failure to remove debris from inside the
exhaust-control device can prevent full travel
of the fuse cartridge during a subsequent
Fault-Clearing operation. This can result
in arcing, equipment damage, serious
injury, or death.
Do not remove the screen or copper
shot at the bottom of the exhaust-control
device. See Figure 5. Doing so can result
in serious injury or death during a
subsequent fault clearing operation.
STEP 4. Unscrew the fuse-tube cap from the fuse tube
and remove the spring-and-cable assembly.
Unscrew the upper terminal of the blown fuse
cartridge from the spring-and-cable assembly
and discard. If the spring-and-cable assembly is
damaged, install a new assembly.
STEP 5. Visually inspect the fuse tube bore and, if
required, remove any debris.
STEP 6. Push the upper ferrule down until it reaches
a positive stop to verify full travel of the
upper ferrule and the latching mechanism. See
Figure 2 on page 7.
Continue with Steps 2 through Step 6 of
the “Fusing” section on pages 7 and 8.
Figure 5. Checking the continuity of a backup limiter.
(Cross-sectional view of exhaust-control section.)
Screen
Copper
shot
Trunnion
Button
contact

10 S&C Instruction Sheet 451-500
Installing and Closing a Fault Tamer Fuse Limiter
Figure 6. Installing a Fault Tamer Fuse Limiter into a mounting.
Catalog number 98021
Catalog number 98072
Catalog numbers
98022, 98052, and 98044●
Catalog numbers
98053 and 98054■
●Install and remove using lifting eye in trunnion.
■Does not use extension adapter.
Fault Tamer Fuse
Limiter hinge
Talon curled
prong
Keyhole
Lifting
eye
Talon handling tool
straight prong Lifting eye Lifting eye
Complete the following steps to install and close a Fault
Tamer Fuse Limiter:
STEP 1. Insert the curled prong of an S&C Talon
Handling Tool or a distribution prong into the
opening of the lifting eye. See Figure 6. Or, as an
alternate, insert the straight prong on the S&C
Talon tool or a distribution prong into the
keyhole opening in the trunnion.
NOTICE
For some Fault Tamer Fuse Limiters, the
lifting eye is located in the trunnion. For
other models, the lifting eye is molded into
the backup limiter.
STEP 2. Guide the Fault Tamer Fuse Limiter into the
hinge of the mounting, as shown in Figure 6.
Then, disengage the distribution prong. If a
Talon too is used, rotate the universal pole
counterclockwise 180° to disengage.
STEP 3. Insert the straight prong on the S&C Talon
Handling Tool or a distribution prong in the
pull-ring on the fuse tube and swing the Fault
Tamer Fuse Limiter to within approximately
45° of the fully Closed position. See Figure 7.
Then, while looking away from the Fault Tamer
Fuse Limiter, drive the Fault Tamer Fuse
Limiter to the Closed position using a vigorous
thrust. Carefully disengage the prong from the
pull-ring, taking care to avoid pulling the Fault
Tamer Fuse Limiter open.
WARNING
Use of the Talon Handling Tool curled
prong to close a Fault Tamer Fuse Limiter
can prevent full closure, resulting in arcing,
equipment damage, serious injury, or death.
Figure 7. Swing the Fault Tamer Fuse Limiter to within
approximately 45° of the fully Closed position (approximately
20° above the horizontal) before a final Closing operation.
45°
20°
25°

S&C Instruction Sheet 451-500 11
Opening a Fault Tamer Fuse Limiter
WARNING
Do not attempt to open a Fault Tamer Fuse
Limiter to interrupt load current without the use of
a loadbreak tool such as Loadbuster®—The S&C
Loadbreak Tool. An arc started by opening a Fault
Tamer Fuse Limiter under load without a loadbreak
tool can cause arcing, equipment damage, serious
injury, or death.
S&C’s Loadbuster tool is ideally suited for use in opening
Fault Tamer Fuse Limiters. The Loadbuster tool is S&C’s
unique method of providing low-cost, positive, and
convenient live-switching capability for such devices.
Instructions for use of the Loadbuster tool with an S&C
Fault Tamer Fuse Limiter are shown in the next section.
Following an opening operation using a Loadbuster
tool, the Fault Tamer Fuse Limiter can be lifted out of the
mounting using a universal pole equipped with a suitable
fuse-handling fitting, such as an S&C Talon Handling Tool
or a distribution prong.
NOTICE
A Fault Tamer Fuse Limiter should not be left in the
Open position for an extended period of time because
water may damage the fuse tube.

12 S&C Instruction Sheet 451-500
Operating with Loadbuster®—The S&C Loadbreak Tool
Figure 8. A Loadbuster tool connected to an S&C Fault Tamer
Fuse Limiter.
Attachment
hook Anchor
Pull-ring hook
Pull-ring latch
Pull-ring
Pull-ring latch
Figure 9. A Loadbuster tool in the Tripped position.
Check for proper resetting of the Loadbuster tool by
extending the tool about 3 inches (76 mm) by hand.
Throughout this travel, an increasing spring resistance
should be felt.
STEP 1. Reach the Loadbuster tool across in front of the
Fault Tamer Fuse Limiter and hook the anchor,
located at the top of Loadbuster tool, over the
attachment hook on the far side of the Fault
Tamer Fuse Limiter. See Figure 8.
STEP 2. Swing the Loadbuster tool toward the Fault
Tamer Fuse Limiter and pass the Loadbuster
tool’s pull-ring hook through the pull-ring on the
Fault Tamer Fuse Limiter. The pull-ring latch
will deect and upon complete entry of the
pull-ring will spring back, locking the
Loadbuster tool to the pull-ring. The Loadbuster
tool is now connected across the upper contacts
of the Fault Tamer Fuse Limiter.
STEP 3. To open the circuit, operate the Loadbuster tool
with a rm, steady pull until it is extended to its
maximum length. See Figure 9. Avoid jerking
and hesitation. The resetting latch will keep it
open. Generally, there will be no indication of
circuit interruption. The only sound will be that
of the Loadbuster tool tripping.

S&C Instruction Sheet 451-500 13
Operating with Loadbuster®—The S&C Loadbreak Tool
Figure 11. Resetting the Loadbuster tool.
Figure 10. Detaching a Loadbuster tool from a Fault Tamer
Fuse Limiter.
Resetting
latch
STEP 4. To detach a Loadbuster tool after circuit
interruption, rst raise it slightly and disengage
the anchor from the attachment hook.
WARNING
Careless manipulation of the Loadbuster
tool can decrease the open gap to the point
where flashover will occur. This can result
in arcing, electrical shock, serious injury,
or death.
Next, bring the Fault Tamer Fuse Limiter
toward its fully Open position, as illustrated
in Figure 10. Then, remove the Loadbuster tool
from the pull-ring by rotating the pole. This will
deflect the pull-ring latch to release the pull-
ring. Because a Fault Tamer Fuse Limiter will
drop fully open by gravity, it may be preferred
to remove the Loadbuster tool by “rolling” it
off both the attachment hook and pull-ring at
the same time by twisting the pole after the
Loadbuster tool has been tripped and fully
extended. To perform this operation easily and
smoothly, always roll the Loadbuster tool so it
rotates in an upward direction.
STEP 5. Toreset aLoadbuster tool for the next operation,
hold it as shown in Figure 11. Extend the tool
slightly and lift the resetting latch with your
thumb. With the latch up, telescope the tool
completely so the trigger can reset itself.
Depress the telescoping tube until the orange
paint on the inner tube assembly is no longer
visible. Check for proper resetting by extending
the tool about 3 inches (76 mm). Throughout
this travel an increasing spring resistance
should be felt.