71
Medium
Voltage
Fuses
Section Contents
Page
Introduction ............................. 72
E-Rated Fues
For transformers & feeders . . . . . . . . . . . . . . . . . . . . . . .75
CL-14 & bolt-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
CL-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
For potential & small power transformers . . . . . . . . . . 78-79
R-Rated fuses for motor circuit protection . . . 80-82
British IEC fuses for motor circuit protection . . . 83
DIN IEC fuses for transformer protection ...... 84
Potential transformer fuses ................. 85
British IEC fuses for oil-filled switchgear ...... 86
Fast-acting fuses ......................... 87
EEI-NEMA Type K & T and Type H & N fuses . . . 88
BBU Boric acid fuses ................... 89-90
Fuseclips for medium and high voltage fuses . . . 91
Medium Voltage Fuses
For detailed information, visit the Electrical IEC section at www.cooperbussmann.com
72
Medium Voltage Fuses
Medium Voltage Fuses
Worldwide Circuit Protection Solutions
Cooper Bussmann is a world-leading supplier of medium
voltage fuses. Each product is backed by an efficient
worldwide distribution network with unrivaled service and
technical support. Cooper Bussmann circuit protection
solutions comply with major international standards: ANSI,
BS, DIN, IEC and UL.
Fuse Types
Medium voltage fuses generally fit into two categories –
expulsion fuses and current limiting fuses. The definitions per
ANSI C37.40 are:
Expulsion Fuse: “A vented fuse in which the expulsion effect
of the gases produced by internal arcing, either alone or
aided by other mechanisms results in current interruption.”
Expulsion fuses will limit the duration of an overcurrent
event, but they will not limit the magnitude of fault current.
Cooper Bussmann offers two types of expulsion fuses:
replacement fuse links for fused cutouts and boric acid
fuses.
Current Limiting Fuse: “A fuse unit that, when in its current-
responsive element is melted by a current within the fuse’s
specified current-limiting range, abruptly introduces a high
resistance to reduce current magnitude and duration,
resulting in subsequent current interruption.” A current
limiting fuse will reduce the magnitude a fault current as well
as limit the duration of the overcurrent event when operating
in its current limiting range. Cooper Bussmann offers a broad
range of current limiting fuses for protection of feeders,
transformers and motor circuits designed to ANSI, BS, DIN
and IEC standards.
Medium Voltage Current Limiting Fuses
Current limiting fuses are classified into three categories:
1. Full Range – defined by ANSI C37.40 as “a fuse capable
of interrupting all currents from the maximum rated
interrupting current down to the minimum continuous current
that causes the melting of the fusible element(s), when the
fuse is applied at the maximum ambient temperature
specified by the manufacturer.” It is able to interrupt any
current that will melt its element.
2. General Purpose – defined by ANSI C37.40 as “a fuse
capable of interrupting all currents from the maximum rated
interrupting current down to the current that causes melting
of the fusible element(s) in one hour.” Not all currents fall
within this range. It is possible for the fuse to be exposed to
an overcurrent lower than the value given by the one hour
criteria. In that case, a different overcurrent protection device
would be required to interrupt the overcurrent.
3. Back-up – defined by ANSI C37.40 as “a fuse capable of
interrupting all currents from the maximum interrupting rating
current down to the minimum interrupting current.”
The minimum interrupting current is the lowest current that
the fuse will be able to clear properly. This creates a need to
place a low current interrupting device, such as motor
overloads, in series with the back-up rated fuse.
E- and R-Rated Fuses
In North America, current limiting fuses typically fall into the
category of E-Rated fuses and R-Rated fuses. Cooper
Bussmann also offers a wide range of current limiting fuses
designed to BS, DIN and IEC standards.
E-Rated fuses are used to protect feeder circuits, power
transformers and potential transformers. E-Rated fuses have
defined current response times specified by ANSI C37.46.
E-Rated fuses 100A and below must melt in 300sec at an
rms current within the range of 200% to 240% of the
continuous current rating. E-Rated fuses above 100A must
melt in 600sec at an rms current within the range of 240% to
264% of the continuous current rating of the fuse. Cooper
Bussmann offers a wide variety of full range and general
purpose E-Rated fuses from 2.4kV up to 38kV.
R-Rated fuses are back-up fuses that provide short-circuit
protection for motor circuits. They are applied with MV motor
starters which provide the overload protection for the circuit.
R-Rated fuses also have defined current response times
specified by ANSI C37.46. R-Rated fuses will melt in a range
of 15 – 35sec at a current equal to 100 times the “R” rating.
Cooper Bussmann offers 2.4kV, 5.08kV, 7.2kV and 8.3kV
R-Rated fuses for motor circuit protection.
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
73
Medium
Voltage
Fuses
Medium Voltage Fuses
MV055 and
MV155
Specifications
Description: E-rated
medium, voltage current-
limiting fuses: for
transformer and feeder protection.
Dimensions: See Catalog Numbers table.
Construction: Silver ribbon element surrounded by silica
filler housed in a fiberglass tube and plated endcaps. An
epoxy paint protects the fuse tube from the surrounding
environment.
Ratings:
Volts: — 5.5kV (5-450A)
— 15.5kV (5-200A)
Amps: — 5-450A (5.5kV)
— 5-200A (15.5kV)
IR: — 50kA Sym. Max
Agency Information: Meets E requirements per ANSI
C37.46, Meets full range requirements per ANSI C37.40.
MV055 Features and Benefits
• Standard clip center distance of 12 inches with 2 and 3 inch
barrel diameters for retrofitting in existing hardware
• Open fuse indicator for ease in troubleshooting
• Full range rating with 50,000 Interrupting Rating
• Double pulsed at 90% of minimum I
2
t to establish
manufacturing reliability
MV055 Typical Applications
• 5.0kV Transformer Primary Protection
• 5.0kV Feeder Circuit Protection
• 5.0kV Voltage Switches
• 5.0kV Metal-enclosed Switchgear
MV155 Features and Benefits
• Standard clip center distance of 15 and 18 inches with 2 and
3 inch barrel diameters for retrofitting in existing hardware
• Open fuse indicator for ease in troubleshooting
• Full range rating with 50,000 Interrupting Rating
• Double pulsed at 90% of minimum I2t to establish
manufacturing reliability
MV155 Typical Applications
• 15.0kV Transformer Primary Protection
• 15.0kV Feeder Circuit Protection
• 15.0kV Voltage Switches
• 15.0kV Metal-enclosed Switchgear
E-rated Fuses for Transformers and Feeders
15.5kV Catalog Numbers
MMiinn MMaaxx DDiimmeennssiioonnss**
CCaattaalloogg AAmmpp MMeelltt CClleeaarr CClliipp
NNuummbbeerrss RRaattiinngg II
22
tt II
22
tt LLeennggtthh DDiiaa.. CCeenntteerr BBaarrrreellss
MV155F1CBX5E 5 180 2,900 18.75 15 1
MV155F1CBX7E 7 850 8,000
MV155F1CBX10E 10 850 8,000
MV155F1CBX15E 15 2,070 12,000 2
MV155F1CBX20E 20 2,370 23,000
MV155F1CBX25E 25 4,650 31,000
MV155F1CBX30E 30 9,490 45,000
MV155F1DBX10E 10 850 8,000 18.75 3 15 1
MV155F1DBX15E 15 2,070 12,000
MV155F1DBX20E 20 2,370 23,000
MV155F1DBX25E 25 4,650 31,000
MV155F1DBX30E 30 9,490 45,000
MV155F1DBX40E 40 9,490 45,000
MV155F1DBX50E 50 13,600 90,000
MV155F1DBX65E 65 30,700 181,000
MV155F1DBX80E 80 54,600 270,000
MV155F1DBX100E 100 116,200 600,000
MV155F2DBX125E 125 123,000 677,000 18.75 3 15 2
MV155F2DBX150E 150 218,700 1,287,000
MV155F2DBX175E 175 314,700 1,689,000
MV155F2DBX200E 200 465,100 2,405,000
MV155F1DCX65E 65 30,700 181,000 21.75 3 18 1
MV155F1DCX80E 80 54,600 270,000
MV155F1DCX100E 100 116,200 600,000
MV155F2DCX125E 125 123,000 677,000 21.75 3 18 2
MV155F2DCX150E 150 218,700 1,287,000
MV155F2DCX175E 175 314,700 1,689,000
MV155F2DCX200E 200 465,100 2,405,000
*1” = 25.4mm.
Data Sheet: 6700
Data Sheet: 6701 (MV155)
5.5kV Catalog Numbers
MMiinn MMaaxx DDiimmeennssiioonnss ((iinn))**
CCaattaalloogg AAmmpp MMeelltt CClleeaarr CClliipp
NNuummbbeerrss RRaattiinngg II
22
tt II
22
tt LLeennggtthh DDiiaa.. CCeenntteerr BBaarrrreellss
MV055F1CAX5E 5 180 2,400 15.75 2 12 1
MV055F1CAX7E 7 850 8,000
MV055F1CAX10E 10 850 8,000
MV055F1CAX15E 15 2,070 11,000
MV055F1CAX20E 20 2,370 23,000
MV055F1CAX25E 25 4,650 31,000
MV055F1CAX30E 30 9,490 45,000
MV055F1CAX40E 40 9,490 45,000
MV055F1CAX50E 50 13,600 90,000
MV055F1CAX65E 65 30,700 181,000
MV055F1DAX10E 10 850 8,000 15.75 3 12 1
MV055F1DAX15E 15 2,070 12,000
MV055F1DAX20E 20 2,370 23,000
MV055F1DAX25E 25 4,650 31,000
MV055F1DAX30E 30 9,490 45,000
MV055F1DAX40E 40 9,490 45,000
MV055F1DAX50E 50 13,600 90,000
MV055F1DAX65E 65 30,700 181,000
MV055F1DAX80E 80 54,600 270,000
MV055F1DAX100E 100 116,200 580,000
MV055F1DAX125E 125 167,400 600,000 15.75 3 12 1
MV055F1DAX150E 150 218,700 786,000
MV055F1DAX175E 175 227,900 1,100,000
MV055F1DAX200E 200 297,600 1,520,000
MV055F2DAX250E 250 669,600 2,400,000 15.75 3 12 2
MV055F2DAX300E 300 874,800 3,149,000
MV055F2DAX350E 350 911,600 4,376,000
MV055F2DAX400E 400 1,190,400 6,071,000
MV055F2DAX450E 450 1,555,000 9,796,000
1” = 25.4mm
Recommended Fuse Clips - see page 91
15.75
12
2
1
2
3
18.75
3
15
1
2
2
1
18
21.75
Recommended Fuse Clips - see page 91