Eaton COOPER POWER SERIES User manual

ELF-LR™ Current-Limiting Fuse
Installation Instructions
COOPER POWER
SERIES
Fusing Equipment
MN132016EN
Effective November 2016
Supersedes
September 2005 (S240-71-1)

ii InstallatIon InstructIons MN132016EN November 2016
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.

iiiInstallatIon InstructIons MN132016EN November 2016
Contents
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY ................................... ii
SAFETY FOR LIFE .........................................................................iv
SAFETY INFORMATION ....................................................................iv
Safety instructions.............................................................................. iv
GENERAL ................................................................................ 1
APPLICATION ............................................................................. 1
OPERATION .............................................................................. 1
INSTALLATION ............................................................................ 1
REMOVAL ................................................................................ 2
TESTING ................................................................................. 3
MAINTENANCE ........................................................................... 3

iv
ELF-LR™ Current-Limiting Fuse
InstallatIon InstructIons MN132016EN November 2016
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.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, may result in equipment damage only.
Safety instructions
Following are general caution and warning statements that
apply to this equipment. Additional statements, related to
specific tasks and procedures, are located throughout the
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

1
ELF-LR™ Current-Limiting Fuse
InstallatIon InstructIons MN132016EN November 2016
General
CAUTION
Eaton’s Cooper Power series ELF-LR™ Current-Limiting
Fuse is designed to be operated in accordance with
normal safe operating procedures. These instructions are
not intended to supersede or replace existing safety and
operating procedures. READ ALL THE INSTRUCTIONS
BEFORE INSTALLING THE ELF-LR FUSE.
The ELF-LR fuse should be installed and serviced only
by personnel familiar with good safety practice and the
handling of high-voltage electrical equipment.
Eaton’s Cooper Power series ELF-LR™ Current-Limiting Fuse
is a full-range current-limiting fuse that is suitable for use in
areas where a high-fire hazard exists. ELF-LR liquid fuses
are noiseless and expel no hot gases or burning particles
while performing fault current interruptions.
The ELF-LR fuse has been granted permanent exemption
by the California Dept. of Forestry and Fire Protection from
the pole clearance requirements when mounted in the field
according to manufacturer’s specifications. The ELF-LR fuse
meets the exemption requirements listed specifically in the
California Code of Regulations, Title 14, Section 1255 (10).
Application
ELF-LR fuses are designed to protect pole-type
transformers, single-phase and three-phase laterals and
underground taps. The ELF-LR fuse is designed to be
mounted in a 15 kV liquid fuse-specific, bushing-style
mounting, such as S & C G-3942.
Operation
The ELF-LR fuse uses a blue cap to cover an orange
indicating band on the upper part of the fuse. When the
fuse operates, a striker pin is fired, dislodging the blue cap
and exposing the indicator band.
Figure 1. Line drawing of 8.3/13.2 kV and 17.2/23 kV
ELF-LR fuse.
Installation
ELF-LR fuses may be used as replacement fuses or in
original equipment. Replace fuses of equal size and rating
only. The ELF-LR fuse can be installed using a Kearney™
Fuse Puller, Part No. 4455-13, mounted on a Kearney
Fit-On™ Stick. Follow the instructions of the mounting
equipment for proper fit and connection.
Refer to Figure 2.
1. Verify that fuse is in the upright position. The 17.2/23kV
rated fuse has a retaining clip that holds the fuse
securely in place. When installing fuse, make sure that
retaining clip is toward cutout.
2. Insert bottom end of fuse in cutout bushing and push
top end into upper cutout bushing, making sure that
fuse is securely positioned.
3. Close cutout locking clips.
CAUTION
As always, when working near live high voltage
equipment, follow all approved safety practices when
installing or removing an ELF-LR.

2
ELF-LR™ Current-Limiting Fuse
InstallatIon InstructIons MN132016EN November 2016
Figure 2. Installing fuse in cutout.
CAUTION
If a fault is present when installing an ELF-LR fuse, the
striker pin will operate, dislodging the blue cap and
exposing the indicator band.
CAUTION
Additional fault locating and repair in accordance
with existing procedures should be completed before
replacing the ELF-LR fuse for a second time.
Removal
Open cutout locking clips. Using fuse puller, remove lower
end of fuse from cutout first, then upper end (see Figure 3).
Figure 3. Proper removal of fuse in cutout.
CAUTION
An ELF-LR fuse in a cutout with the actuator operated
indicates a blown fuse due to an overload or fault
condition. Faults and/or visibly failed equipment
should be located and repaired before reinstalling a
replacement ELF-LR fuse.

3
ELF-LR™ Current-Limiting Fuse
InstallatIon InstructIons MN132016EN November 2016
Testing
A continuity test in the field can determine if the fuse
element is open. This can be done using an ohmmeter or
self-powered continuity tester.
To confirm the integrity of the current-limiting section,
additional shop testing using a micro-ohmmeter to verify the
nominal resistance is recommended (See Table 1).
Table 1. ELF-LR Fuse Resistance Values
ELF-LR Fuse
Catalog No.
Fuse Ratings Resistance (Milliohms)
Voltage (kV) Current (A) Minimum Maximum
FAK81W6LR
FAK81W8LR
FAK81W12LR
FAK81W18LR
FAK81W20LR
8.3/13.2
8.3/13.2
8.3/13.2
8.3/13.2
8.3/13.2
6
8
12
18
20
68.8
49.3
43.3
29.4
24.5
89.0
60.3
53.0
35.9
30.0
FAK71W6LR
FAK71W8LR
FAK71W12LR
FAK71W18LR
FAK71W20LR
17.2/23
17.2/23
17.2/23
17.2/23
17.2/23
6
8
12
18
20
103.8
75.2
69.2
47.2
38.8
130.6
91.9
84.6
57.5
47.4
CAUTION
The ELF-LR fuse should not be installed if it has any
visual signs of operation and/or damage.
Maintenance
In areas of severe contamination, periodically examine
cutouts for build-up. Contact surfaces must be free of
contaminants

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United States
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United States
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All Rights Reserved
Printed in USA
Publication No. MN132016EN Rev. 0
November 2016
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For Eaton‘s Cooper Power series product
information
call 1-877-277-4636 or visit:
www.eaton.com/cooperpowerseries.
!
SAFETY
FOR LIFE