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
71
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.
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.
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.
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.
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.
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.
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.
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.
72
For detailed information, visit the Electrical IEC section at www.cooperbussmann.com
Medium Voltage Fuses
E-rated Fuses for Transformers and Feeders
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
5.5kV Catalog Numbers
Catalog
Numbers
Amp
Rating
Min
Melt
I
2
t
Max
Clear
I
2
t
2,400
8,000
8,000
11,000
23,000
31,000
45,000
45,000
90,000
181,000
8,000
12,000
23,000
31,000
45,000
45,000
90,000
181,000
270,000
580,000
600,000
786,000
1,100,000
1,520,000
2,400,000
3,149,000
4,376,000
6,071,000
9,796,000
Dimensions (in)*
Clip
Length Dia. Center Barrels
15.75
2
12
1
MV055F1CAX5E
5
180
MV055F1CAX7E
7
850
MV055F1CAX10E
10
850
MV055F1CAX15E
15
2,070
MV055F1CAX20E
20
2,370
MV055F1CAX25E
25
4,650
MV055F1CAX30E
30
9,490
MV055F1CAX40E
40
9,490
MV055F1CAX50E
50
13,600
MV055F1CAX65E
65
30,700
MV055F1DAX10E
10
850
MV055F1DAX15E
15
2,070
MV055F1DAX20E
20
2,370
MV055F1DAX25E
25
4,650
MV055F1DAX30E
30
9,490
MV055F1DAX40E
40
9,490
MV055F1DAX50E
50
13,600
MV055F1DAX65E
65
30,700
MV055F1DAX80E
80
54,600
MV055F1DAX100E
100
116,200
MV055F1DAX125E
125
167,400
MV055F1DAX150E
150
218,700
MV055F1DAX175E
175
227,900
MV055F1DAX200E
200
297,600
MV055F2DAX250E
250
669,600
MV055F2DAX300E
300
874,800
MV055F2DAX350E
350
911,600
MV055F2DAX400E
400
1,190,400
MV055F2DAX450E
450
1,555,000
1” = 25.4mm
Recommended Fuse Clips - see page 91
2
15.75
3
12
1
Medium
Voltage
Fuses
1
15.75
12
3
15.75
3
12
1
15.75
3
12
2
2
Data Sheet: 6700
15.5kV Catalog Numbers
Catalog
Numbers
MV155F1CBX5E
MV155F1CBX7E
MV155F1CBX10E
MV155F1CBX15E
MV155F1CBX20E
MV155F1CBX25E
MV155F1CBX30E
MV155F1DBX10E
MV155F1DBX15E
MV155F1DBX20E
MV155F1DBX25E
MV155F1DBX30E
MV155F1DBX40E
MV155F1DBX50E
MV155F1DBX65E
MV155F1DBX80E
MV155F1DBX100E
MV155F2DBX125E
MV155F2DBX150E
MV155F2DBX175E
MV155F2DBX200E
MV155F1DCX65E
MV155F1DCX80E
MV155F1DCX100E
MV155F2DCX125E
MV155F2DCX150E
MV155F2DCX175E
MV155F2DCX200E
*1” = 25.4mm.
Amp
Rating
5
7
10
15
20
25
30
10
15
20
25
30
40
50
65
80
100
125
150
175
200
65
80
100
125
150
175
200
Min
Melt
I
2
t
180
850
850
2,070
2,370
4,650
9,490
850
2,070
2,370
4,650
9,490
9,490
13,600
30,700
54,600
116,200
123,000
218,700
314,700
465,100
30,700
54,600
116,200
123,000
218,700
314,700
465,100
Max
Clear
I
2
t
2,900
8,000
8,000
12,000
23,000
31,000
45,000
8,000
12,000
23,000
31,000
45,000
45,000
90,000
181,000
270,000
600,000
677,000
1,287,000
1,689,000
2,405,000
181,000
270,000
600,000
677,000
1,287,000
1,689,000
2,405,000
Dimensions*
Clip
Length Dia. Center Barrels
18.75
15
1
2
18.75
3
15
1
1
18.75
15
18.75
3
3
15
2
2
21.75
3
18
1
1
21.75
21.75
3
18
18
2
2
Recommended Fuse Clips - see page 91
Data Sheet: 6701 (MV155)
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
73
Medium Voltage Fuses
E-rated Fuses for Transformer & Feeders
JCX, JCY, JCU, JCZ
and JDZ
Specifications
Description:
Indoor/enclosure
E-rated medium voltage, current-
limiting fuses for feeders and
power transformers with blown fuse
indication.
Dimensions:
See Catalog
Numbers table.
Construction:
plated ferrules.
Ratings:
Volts: — 2750-8300V (See Catalog Numbers table for
details)
Amps: —
1
⁄
2
-750A
IR: — 40-63kA Sym
— 60-100kA ASYM
— See Catalog Numbers table for details
Catalog Numbers
Catalog
Amp
Maximum
Numbers
Rating
Design Voltage
2400V; E-Rated; Indoor/Enclosure
JCX-
1
⁄
2
E
0.5
2750
JCX-1E
1
2750
JCX-2E
2
2750
JCX-3E
3
2750
JCX-5E
5
2750
JCX-7E
7
2750
JCX-10E
10
2750
JCX-15E
15
2750
JCX-20E
20
2750
JCX-25E
25
2750
JCX-30E
30
2750
JCX-40E
40
2750
JCX-50E
50
2750
JCX-65E
65
2750
JCX-80E
80
2750
JCX-100E
100
2750
JCX-125E
125
2750
JCX-150E
150
2750
JCX-200E
200
2750
JCX-225E
225
2750
JCX-250E/280X
250/280
2750
JCX-300E/325X
300/325
2750
JCX-350X
350
2750
JCX-400X
400
2750
JCX-450X
450
2750
5500V; E-Rated; Indoor/Enclosure
JCY-
1
⁄
2
E
0.5
5500
JCY-1E
1
5500
JCY-2E
2
5500
JCY-3E
3
5500
JCY-5E
5
5500
JCY-7E
7
5500
JCY-10E
10
5500
JCY-15E
15
5500
JCY-20E
20
5500
JCY-25E
25
5500
Construction
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Double
Double
Double
Double
Double
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Maximum Interrupting Capacity
Amps (Asym.)
Amps (Sym.)
60,000
60,000
60,000
60,000
60,000
60,000
60,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
40,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
Dimensions - in (mm)
Length
Diameter
9.19 (233.38)
9.19 (233.38)
9.19 (233.38)
9.19 (233.38)
9.19 (233.38)
9.19 (233.38)
9.19 (233.38)
9.5 (241.3)
9.5 (241.3)
9.5 (241.3)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
10.81 (276.35)
11.19
11.19
11.19
11.19
11.19
11.19
11.19
11.19
11.19
11.19
(284.18)
(284.18)
(284.18)
(284.18)
(284.18)
(284.18)
(284.18)
(284.18)
(284.18)
(284.18)
2 (50.8)
2 (50.8)
2 (50.8)
2 (50.8)
2 (50.8)
2 (50.8)
2 (50.8)
2.1 (53.34)
2.1 (53.34)
2.1 (53.34)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
2
2
2
2
2
2
2
2
2
2
(50.8)
(50.8)
(50.8)
(50.8)
(50.8)
(50.8)
(50.8)
(50.8)
(50.8)
(50.8)
Features and Benefits
• Physically dimensioned for retrofitting in existing hardware
• Open fuse indicator for ease in troubleshooting
• Full range ANSI classification
Typical
• Medium
• Medium
• Medium
• Medium
Applications
Voltage Transformer Primary Protection
Voltage Feeder Circuit Protection
Voltage Switches
Voltage Metal-enclosed Switchgear
Contact Cooper Bussmann for the latest product information on E-Rated fuses for transformer and feeder protection.
Recommended fuseclips: see page 91 - 1A0065, 9078A67G04, A3354730
74
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
Medium Voltage Fuses
E-rated Fuses for Transformer & Feeders
Catalog Numbers: E-Rated; Indoor/Enclosure
Catalog
Amp
Numbers
Rating
5500V; E-Rated; Indoor/Enclosure
JCU-10E
10
JCU-15E
15
JCU-20E
20
JCU-25E
25
JCU-30E
30
JCU-40E
40
JCU-50E
50
JCU-65E
60
JCU-80E
80
JCU-100E
100
JCU-125E
125
JCU-150E
150
JCU-175E
175
JCU-200E
200
JCU-250E
250
JCU-300E
300
JCU-350E
350
JCU-400E
400
JCU-450E
450
JCU-600E
600
JCU-750E
750
8300V; E-Rated; Indoor/Enclosure
JCZ-15E
15
JCZ-20E
20
JCZ-25E
25
JCZ-30E
30
JCZ-40E
40
JCZ-50E
50
JCZ-65E
65
JCZ-80E
80
JCZ-100E
100
JCZ-125E
125
JCZ-150E
150
JCZ-200E
200
JDZ-20E
20
JDZ-25E
25
JDZ-30E
30
JDZ-40E
40
JDZ-50E
50
JDZ-65E
65
JDZ-80E
80
JDZ-100E
100
JDZ-125E
125
Maximum
Design Voltage
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
5500
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
8300
Construction
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Double
Double
Double
Double
*
*
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Double
Single
Single
Single
Single
Single
Single
Double
Double
Double
Maximum Interrupting Capacity
Amps. (Asym.)
Amps. (Sym.)
80,000
80,000
80,000
80,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
100,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
50,000
50,000
50,000
50,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
63,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
Dimensions - in (mm)
Length
Diameter
17.81
12.88
12.88
12.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
28.81
28.81
15.51
15.51
15.51
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
17.88
15.88
15.88
15.88
15.88
15.88
15.88
15.88
15.88
15.88
(452.4)
(327.0)
(327.0)
(327.0)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(731.77)
(731.77)
(393.95)
(393.95)
(393.95)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(454.15)
(403.2)
(403.2)
(403.2)
(403.2)
(403.2)
(403.2)
(403.2)
(403.2)
(403.2)
3 (76.2)
2.1 (53.34)
2.1 (53.34)
2.1 (53.34)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
3 (76.20)
4 (101.60)
4 (101.60)
2.1 (53.34)
2.1 (53.34)
2.1 (53.34)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
3 (76.2)
Medium
Voltage
Fuses
Recommended fuseclips: see page 91 - 1A0065, 9078A67G04, A3354730
General Notes:
1. All fuses are fitted with a striker pin which can be used for indication or tripping purposes.
2. The fuses are suitable for use either indoors or outdoors.
3. These fuses are interchangeable with corresponding fuses produced by most other leading North American manufacturers.
Contact Cooper Bussmann for the latest product information on E-Rated fuses for transformer and feeder protection.
*Bolt on mounting
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
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