Medium Voltage Fuse Links
Full Line Catalogue
Medium Voltage Fuse Links Full Line Catalogue
Cooper Bussmann, a division of Cooper Industries, is the leading source of circuit
protection solutions in the global marketplace. Cooper Bussmann products are approved for
use around the world and meet agency requirements and international standards: IEC, VDE,
DIN, UL, CSA, BS and others.
Cooper Bussmann global headquarters are in St Louis, Missouri (US) and the European
headquarters are in Burton-on-the-Wolds, Leicestershire (UK).
Cooper Bussmann manufactures over 50,000 part numbers covering extensive circuit
protection solutions for a wide range of applications: residential, industrial, motor
protection, power conversion, distribution, telecommunications, electronics and
automotive.
Cooper Bussmann has been a leading exponent in the design, development and
manufacture of medium voltage fuse links and their associated accessories for more than 90
years and has supplied fuse links to more than 90 countries worldwide.
The Cooper Bussmann team of specialist engineers plays a leading role in international
standardisation of medium voltage fuse links, offering comprehensive advice on selection
and applications.
With a continual commitment to meet our customers’ needs with innovative high quality
products with ISO 9002 ‘approval systems,’ Cooper Bussmann is the supplier of choice for
medium voltage circuit protection solutions, today.
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For product data sheets, www.cooperbussmann.com/DatasheetsIEC
Table of Contents
Introduction to Medium Voltage Fuse Link Technology
How to Order
DIN Fuse Links
Motor Fuse Links
Auxiliary Transformer Fuse Links
Oil Fuse Links
British Standard Air Fuse Links
US Style E-Rated Fuse Links
Fuse Clips
Expulsion Fuse Links
ASL - Automatic Sectionalising Links
Boric Acid Fuse Links
Cross References
DIN Fuse Links
Motor Fuse Links
Voltage and Auxiliary Transformer Fuse Links
Oil Fuse Links
British Standard Air Fuse Links
US Style E-Rated Fuse Links
Boric Acid Fuse Links
Time-Current Curves and Cut-Off Curves List
Index
109 to 110
111
111
112
113
114 to 118
119
120 to 121
122
4 to 6
7 to 8
9 to 24
25 to 34
35 to 54
55 to 62
63 to 75
76 to 93
94 to 95
96 to 97
98 to 101
102 to 108
For product data sheets, www.cooperbussmann.com/DatasheetsIEC
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Medium Voltage Fuse Links Full Line Catalogue
Introduction to Medium Voltage Fuse Link Technology
Offering unparalleled short-circuit interruption capabilities, Medium Voltage (MV) current-limiting fuse links are the principle
protection device used by electrical utilities and switchgear manufacturers throughout the world. Safe, reliable, environmentally
friendly and cost effective, MV fuse links are the protection device of choice for distribution circuits due to their speed of
operation and
current limiting
ability in the event of a short-circuit fault.
The diagram below shows the operation of a fuse link interrupting a short-circuit fault, achieving a current zero well within the
first half-cycle of a fault. Energy let-through into the site of a fault maybe typically only
1/500
th
of that of any other type of
switching device.
lt
Time in seconds
Peak amps
2
RMS
amps
l
2
The speed of operation reduces the effect of short-circuit currents, dramatically limiting the energy delivered to the faulted
circuit, preventing the catastrophic results of high faults and disturbing voltage arcs. The fuse link operation significantly limits
the arc-flash hazard at the fault location. Improved power supply quality also results from the use of fuse links. High fault
currents are interrupted in a few milliseconds, minimising voltage dips in system supply voltage.
Glossary for Medium Voltage Fuse Links
The following is a brief introduction to medium voltage fuse link technology. Some of the terms are also used in other areas of
fuse technology.
Current rating/Rated current, In -
The rated current of the fuse link, given in amps.
Derating -
A reference to the fact that all MV fuse links must be derated once they are placed in a confined
space, for example when mounted in switchgear. The fuse link must be derated to take into account the effect of
heating on element resistance. Typically a fuse link is derated by between 5-20% depending on application.
Test Duty, TD -
A term used to refer to a specific type test within the IEC standard. Test Duty one
(TD1),
short-circuit test, Test Duty two
(TD2),
maximum arc energy test and Test Duty three
(TD3),
low overcurrent test.
Minimum Breaking Capacity Current, MBC, I
3
-
The minimum current the fuse link can interrupt safely, without
assistance from switchgear with instantaneous striker tripping.
Minimum Fusing Current (MFC) -
The minimum current which will cause the fuse link elements to
start to melt.
I
2
T -
The minimum value of pre-arcing and maximum value of total clearing energy a fuse link will allow to pass
through it during short circuit operation, expressed as an amount of current (I
2
), multiplied by time in seconds.
Watts Loss -
The power dissipation of the fuse link at a stated value of load current.
Breaking Capacity, I
1
-
The maximum short circuit current the fuse link has been tested to in accordance with
test Duty one (TD1), expressed in kA.
Resistance -
The resistance of the fuse link in free air at (20
o
C), measured in m
Ω
.
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For product data sheets, www.cooperbussmann.com/DatasheetsIEC
Introduction to Medium Voltage Fuse Link Technology
The main standard covering Medium Voltage (MV) fuse links is IEC 60282-1, 2009. IEC defines
MV as from 1kV to 72.5kV.
Current-limiting MV fuse links, split into three internationally recognised types:
Back-Up
(or sometimes called partial range), fuse
links, which will interrupt any current from their rated breaking capacity down to a minimum breaking current, specified by the
manufacturer.
General Purpose
MV fuse links will interrupt all currents that will melt the elements within one hour.
Full Range
MV fuse links can interrupt any current below the rated breaking capacity that melts the fuse elements satisfactorily.
The diagram below illustrates the three performance criteria in terms of their minimum breaking current I
3
.
Medium Voltage electrical fuse link performance to IEC 60282-1
Back-Up
Fuse Link
Zone of uncertain protection
General Purpose
Fuse Link
Zone of uncertain
protection
Full Range
Fuse Link
Minimum Breaking
Current (MBC) I
3
Typically 1.1 x I
N
Minimum fusing
current in free air
Typically 1.4 x I
N
Minimum fusing
current under
DERATED conditions
Minimum Breaking
Current (MBC)
Typically 1.8 x I
N
Current (amps)
Minimum Breaking
Current (MBC)
Typically 3 x I
N
Current-limiting MV fuse links are similar in construction to Low Voltage (LV) cartridge types. Fuse elements do need to be much
longer however to safely interrupt a medium voltage short-circuit. This is achieved by winding the elements round an internal
core or holder, often called a star-core or spider; using this technique a one metre length element can be accommodated in a
250mm length body. The elements are surrounded by a pure, highly compacted granular quartz filler.
Like a LV fuse link, a MV fuse link has a ceramic body. Most current-limiting MV fuse links are also fitted with a striker
mechanism. This is used to operate the trip bar or mechanism in a fuse-switch combination, fuse-switch or ring main unit (RMU)
to achieve low overload fault interruption and three-phase disconnection.
Typically striker mechanisms are driven by a spring mechanism, triggered by a thin striker wire or striker coil running the length
of the fuse link, connected in parallel to the fuse link elements. The striker coil is of much higher resistance than the fuse link
elements, so a current only flows through the striker coil when the fuse link elements melt. The current heats up the striker coil
and this in turn melts the wire retaining the spring, releasing it and pushing out the striker.
Porcelain Barrel
End Cap
Striker Coil
Striker
Porcelain
Barrel
Granular
Quartz
Striker
Coil
Weather Seal
Fuse Elements
Star Core
Starcore
Granular Quartz
Elements
For product data sheets, www.cooperbussmann.com/DatasheetsIEC
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