1
ELSG Full-Range Current-Limiting Fuse
RE-FUSING INSTRUCTIONS MN132017EN November 2016
CAUTION
Eaton’s Cooper Power series ELSG Full-Range 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
INSTRUCTIONS BEFORE RE-FUSING AN ELSG FUSE.
The fuse should be installed and serviced only by
personnel familiar with good safety practice and the
handling of high-voltage electrical equipment.
Product Information
CAUTION
Remove and park all load side separable connectors and
install insulated protective caps on tap bushing before
installing or removing fuse. Fuse IS NOT a loadbreak
device.
Introduction
The ELSG fuse is designed for use in padmount
switchgear filled with mineral oil or approved equivalent.
(Refer to Figure 2.) It may also be used to protect power
transformers, feeders and other equipment that can benefit
from its energy-limiting properties. The fuse provides
consistent clearing of low currents as well as reliable high
speed interruption of high magnitude short circuit currents.
Its current-limiting capability limits both peak current
magnitude and fault duration, thus limiting the let-through
energy. The ELSG fuse is installed into the wetwell holder
assembly of de-energized apparatus using a shotgun stick.
3/8"-16 THREAD
1.85"
(46.99 mm)
A
B
3.25"
(82.6 mm)
3.00"
(76.2 mm)
1.00"
(25.4 mm)
2.155"
(54.74 mm)
1.0"
(25.4 mm)
4.30"
(109.2 mm)
2.33"
(59.2 mm)
4.37"
(111 mm)
1.53"
(38.9 mm)
.722"
(18.3 mm)
A
B
.625"
(15.9 mm)
A
B
2.33"
(59.2 mm)
2.155"
(54.74 mm)
1.00"
(25.4 mm)
3/8"-16 THD
x .5 FULL
THD. DEPTH
3.30"
(83.82 mm)
3/8"-16
THD THRU
1.20"
(30.48 mm)
.30"
(7.62 mm)
1.23"
(31.24 mm)
2.17"
(55.12 mm)
2.17"
(55.12 mm)
3.38"
(85.85 mm)
A
B
1.00"
(25.40 mm)
4.00"
(101.6 mm)
DELRIN GUIDE ROD –
USED AS A MECHANICAL
GUIDE FOR EASIER
INSTALLATION
4.68"
(118.9 mm)
TRIPLE FUSE ASSEMBLY
a) Two-inch diameter single barrel fuse*
b) Three-inch diameter single barrel fuse
c) Two-inch diameter double barrel fuse*
d) Two-inch diameter triple barrel fuse
Figure 1. Line illustration of ELSG Full Range Current-
Limiting Fuses.
† Used as a mechanical guide for easier installation on fuse
installed in the 25 and 35 kV wetwell holder.
With ELSG Fuse
Oil-Filled
Padmount
Switchgear
Figure 2. Oil-filled switchgear with ELSG fuse installed
in wetwell holder.