Medium Voltage Fuses
Medium Voltage Fuses
18
Medium Voltage Fuses
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product History Time Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Application and Naming . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current-Limiting Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expulsion Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Further Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pricing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V12-T18-2
V12-T18-2
V12-T18-2
V12-T18-3
V12-T18-4
V12-T18-5
V12-T18-6
V12-T18-8
V12-T18-8
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Volume 12—Aftermarket, Renewal Parts and Life Extension Solutions
CA08100014E—October 2016 www.eaton.com
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V12-T18-2
Medium Voltage Fuses
Medium Voltage Fuses
Current-Limiting and Expulsion Fuses
Current-Limiting and
Expulsion Fuses
Originally a
Westinghouse Product
Product History
The Eaton power fuse product
line was introduced in the
1930s by Westinghouse
Electric Corporation. As power
systems grew in size, the need
to sectionalize utility feeders
and to protect equipment
became apparent. The initial
fuse development efforts
resulted in the creation of
non-current-limiting, expulsion
type fuses. As the available
fault currents grew, the need
for a current-limiting fuse was
apparent and this resulted in
new interruption techniques.
While basic fuse technology
has not changed greatly
over the years, gradual
improvements have been
made to make the fuses
more current-limiting and
easier to manufacture and
install. Because standards
for fuses (ANSI C37) detail
only test methods and basic
performance requirements,
many different varieties of
fuses (length, diameter, short-
circuit interruption curves)
have been introduced over
the years.
Eaton presently manufactures
medium voltage fuses in
Haina, DR.
Product History Time Line
Page
Product 1935 1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 2000 Present
BAL
BAL-R
V12-T18-4 CLE
V12-T18-4 CLS
V12-T18-4 CLPT
V12-T18-4 CLT
V12-T18-4 CX/CXN
V12-T18-4 HLE
BA
DBA
V12-T18-5 RBA
V12-T18-5 RDB
DBS
V12-T18-5 DBU
Product Description
Eaton medium voltage
fuses offer such a range of
characteristics that almost
any fuse application, within
the practical range of such
interrupting devices, may
be satisfied. This range of
characteristics is offered
in part by the production of
both expulsion and current-
limiting power fuses.
Expulsion and current-limiting
fuses provide such diverse
characteristics by employing
different areas of fuse
technology. These differences
in technology, along with the
diverse characteristics, require
that different questions be
answered when applying
expulsion and current-
limiting fuses.
General Information
Fuses in Perspective
Voltage
Medium
Voltage
Current
Limiting
General
Backup Purpose
Distrbution
Power
CR
E
Expulsion
Cutouts
& Others
Distrbution
T
Boric
Acid
Power
KE
Type
Class
Application
Amp Rating
Advantages
Medium Voltage Fuse Comparison
Expulsion
Vented
Electromechanical
Expels gases/noise
Interrupts at natural current zero
Generally higher voltage/current applications
Differences in time/current characteristics
Current-Limiting
Sealed
Static
No gases/noise
Limits fault current
Generally higher interrupting ratings
Differences in time/current characteristics
Notes
1
BAL superseded by CLE.
2
BAL-R superseded by CLS.
3
BA—Refills and holders only, new installations use RBA.
4
DBA—Refills only.
5
DBS—Superseded by DBU.
Volume 12—Aftermarket, Renewal Parts and Life Extension Solutions
CA08100014E—October 2016 www.eaton.com
Medium Voltage Fuses
Current-Limiting and Expulsion Fuses
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Application Guide
Selection Guide
Ratings
kV,
Ampere,
Brand kA
2.4–15.5 kV
10E–1350A
to 85 kA
4.3–15.5 kV
3.5C–300C
50 kA
2.4–15.5 kV
4A–150A
25 kA
2.4–38 kV
0.25E–10E
to 80 kA
2.4–8.3 kV
2R–36R
50 kA
4.8–34.5 kV
0.5E–720E
4.8–34.5 kV
0.5E–720E
14.4–38 kV
5E–200E
15SE–200SE
3K–200K
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■
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■
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Type
Current
limiting
Class
General
purpose
Use
Feeder
Circuit
Power
Section- Fused
Trans-
alizing
Switches formers
■
■
■
Substation
Service
Underground
Trans-
DIP Distribution
formers
Pole Transformers
■
Pole-
Mounted
Trans-
formers
Pad-
Mounted
Distribution
Transformers
Sub-
Potential station
Motor Trans-
Capacitor
Starters formers Banks
■
Power BHLE/
CLE/
HLE/
HCL
Dist.
CX/
CXN
CLT
■
■
■
Backup
Power CLPT
6
7
■
■
Power BCLS/
CLS
Expulsion
Boric
acid
Power RBA
RDB
DBU
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9
10
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Guide to Names
BCLS—Bolt-in
version of
CLS fuse.
BHLE—Bolt-in
version of
HLE fuse.
CLE—Current-limiting
E-rated.
HLE/HCL—Current-limiting
E-rated, interchangeable
with General Electric and
Gould Shawmut.
CX/CXN—Current-limiting
interchangeable with
McGraw-Edison’s NX
brand fuses, C-rated.
CLT—Current-limiting
transformer fuse.
CLPT—Current-limiting
E-rated for potential
transformers.
CLS—Current-limiting
for
motor starters, R-rated.
RBA—Refillable
boric acid
expulsion fuse (indoor use).
RDB—Refillable
dropout
boric acid expulsion fuse
(outdoor use).
DBU—Dropout
boric acid
fuse interchangeable with
S&C’s SMU-20 refill.
Guide to Ampere Ratings
“E” Designation
Fuse rated 100E or below
will melt in 300 seconds at
a current value between 2.0
and 2.4 times the E number.
Fuse rated above 100E will
melt in 600 seconds at a
current value between 2.2
and 2.64 times the E number.
If the current is higher
than 2.4 or 2.64 times the
E number, the user must
consult the time-current
curves for that particular fuse.
“R” Designation
The fuse will melt in 15
to 35 seconds when the
current equals 100 times
the R number.
If the current is higher than
100 times the R number, the
user must consult the time-
current curves for that fuse.
“C” Designation
The fuse will melt in
1000 seconds at a current
value, between 1.7 and
2.4 times the C number.
If the current is higher than
2.4 times the C number,
the user must consult the
time-current curves for that
particular fuse.
“A” Designation
Fuses that do not comply
with “E,” “R” or “C”
designations.
Expulsion fuses can also be
E-rated, K-rated and T-rated,
and are also covered in the
ANSI standards. The K and
T ratings refer, respectively,
to relatively “fast” and
“slow” melting expulsion
fuses. Detailed time-current
tables adequately define
these ratings.
Volume 12—Aftermarket, Renewal Parts and Life Extension Solutions
CA08100014E—October 2016 www.eaton.com
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V12-T18-4
Medium Voltage Fuses
Current-Limiting Fuses
Current-Limiting Fuses
Product Description
Current-limiting fuses are
constructed with pure silver
fuse elements, a high-purity
silica sand filler, a specially
designed core and a glass
resin outer casing.
A high fault current melts the
silver element almost instantly
and loses energy to the
surrounding sand. The sand
melts and forms fulgurite,
a glass-like substance.
The arc voltage rapidly
increases to nearly three
times the fuse voltage rating
and forces the current to
zero. Low fault current melts
a solder drop on the silver
fuse element that, in turn,
melts the silver.
General Information
Applications
Current-limiting technologies
can be used to meet almost
every fuse application. Typical
applications for utility,
industrial, construction and
OEM customers include:
●
Accessories
A wide assortment of
mountings, live parts and
end fittings are available
to facilitate power fuse
installation.
Mountings
include a base,
porcelain or glass polyester
insulators and live parts. They
help enable the fuse to be
safely attached to the gear.
Mountings can be either
disconnect or nondisconnect.
Live Parts
attach the fuse
to the mountings and are
considered part of the
mounting. All parts above
the insulators are live parts.
CLE and HLE Current-Limiting—E-Rated
●
●
●
●
●
●
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CLPT Current-Limiting E-Rated for
Potential Transformer Protection
The element burns back until
there is a sufficient internal
gap to interrupt the current.
This is known as the M-effect.
Eaton current-limiting fuses
are offered in two basic
types: backup and general
purpose. Backup fuses
have a published minimum
interrupting current and
require a series device for
breaking the circuit for
currents below this minimum
level. General purpose fuses
have improved low current
interruption capability and are
designed to interrupt low fault
currents that cause the fuse to
melt in one hour or less.
Feeder circuit
sectionalizing
Power transformers
Substation service
transformers
Underground distribution
transformers
Pole-mounted
transformers
Pad-mounted distribution
transformers
Fused switches
DIP poles
Motor starters
Potential transformers
Substation capacitor banks
Live Parts
CLS Current-Limiting for Motor Starter
End Fittings
are metal parts
that attach to each end of
the fuse at the ferrules.
They are used only on
disconnect fuses or when
converting a nondisconnect
to a disconnect fuse.
CX Current-Limiting—Interchangeable
with McGraw Edison’s NX Type
CLT Current-Limiting
for Transformer Protection
Volume 12—Aftermarket, Renewal Parts and Life Extension Solutions
CA08100014E—October 2016 www.eaton.com
Medium Voltage Fuses
Expulsion Fuses
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Expulsion Fuses
Product Description
Eaton expulsion fuses
use boric acid as the
interrupting medium. Under
a fault condition, arc heat
decomposes the boric acid,
which produces gases and
boric anhydride. The water
vapor blast extinguishes the
arc in a deionizing action
and exits from the bottom
of the fuse.
Type RBA indoor expulsion
fuses are fitted with a filter
or condenser that moderates
the discharge exhaust. The
discharge filter limits the
exhaust to a small and
relatively inert amount of
gas and lowers the noise
level without affecting the
fuse interrupting rating.
Steam discharge, that can
affect the interrupting, is fully
restricted by the condenser.
Each type RDB outdoor
dropout fuse includes an
ejector pin that is forced
through the top of the fuse.
The ejector pin releases a
latch on the mounting and the
fuseholder is kicked outward
and swings into the dropout
position, through 180° with a
vertical mounting, or 90° with
an underslug mounting.
Refill units can be field
installed into RBA and RDB
expulsion fuses. Once the old
unit has been removed, the
separately purchased unit
can be easily installed into
the fuse holder.
Accessories
The following accessories are
available for expulsion fuses:
Mountings
include a base,
porcelain or glass polyester
insulators and live parts. They
help enable the fuse to be
safely attached to the gear.
Mountings can be either
disconnect, nondisconnect
or dropout. Fuses may be
vertical or underhung.
Live Parts
attach the fuse
to the mountings and are
considered part of the
mounting. All parts above
the insulators are live parts.
End Fittings
must be
mounted on DBU fuse units
to enable them to be fitted
into the mounting.
Filters and Condensers
are for indoor applications of
RBA expulsion fuses. They
confine the arc within the
fuse and substantially reduce
the noise and exhaust when
the fuse interrupts.
Mufflers
are used with DBU
fuses in indoor applications
to virtually eliminate offensive
noise and exhaust gases
when the fuse interrupts.
General Information
Applications
Expulsion technologies can
be used to meet a number
of fuse applications. Typical
applications for utility,
industrial construction and
OEM customers include:
●
RBA—Refillable Boric Acid
●
●
●
RDB—Refillable Dropout Boric Acid
●
●
●
Feeder circuit
sectionalizing
Fused switches
Power transformers
Substation service
transformers
DIP poles
Potential transformers
Substation capacitor banks
DBU—Dropout Boric Acid—
Interchangeable with S&C’s SMU-20
Volume 12—Aftermarket, Renewal Parts and Life Extension Solutions
CA08100014E—October 2016 www.eaton.com
V12-T18-5
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