Hi-Tech Fuses, Inc.
Product Information Sheet
Trans-Guard OS & OS Shorty Backup Type Current-Limiting Fuses
GENERAL:
The Trans-Guard OS (Oil-Submersible) and the Trans-Guard OS Shorty
backup type current-limiting fuses are primarily used with a series connected
bayonet or terminal board weak link expulsion fuse for “two-fuse” protection
of distribution transformers. The newer OS Shorty fuses were specifically
designed to be more compact in size and allow for easier installation in
smaller distribution transformers. Both the OS and OS Shorty fuses’ ability to
significantly reduce fault energy and their very high interruption capability
(50kA symmetrical) provide state-of-the-art protection against today’s ever
increasing available fault currents. Utilizing these designs minimizes the
likelihood of disruptive equipment failures, such as transformer tank ruptures, by limiting the amount of energy
that is let through to the source of the fault to a value below the withstand capability of the transformer.
DESIGN FEATURES:
Ø Highest current ratings available in a single fuse body minimizes the costs and physical space
associated with paralleling two fuses to achieve the desired current rating.
Ø Smaller physical size achieved particularly with our line of OS Shorty fuse designs.
Ø Rigorous testing to meet ANSI/IEEE standards and internal quality requirements including 100%
physical inspection, resistance measurement, and helium mass spectrometer leak testing.
Ø Durable design for long life including machined brass end caps, filament-wound high temperature epoxy
tubular bodies, sand filler and hermetic sealing system.
Ø High fault current interrupting capability (50,000 amperes symmetrical) for most ratings.
Ø Broad range of fuse ratings available with our Standard OS and Shorty OS lines (30 amps – 400 amps).
Ø Elevated rated maximum voltages (10kV,17.2kV, and 25.5kV) suitable with many of the OS Shorty designs.
FUSE RATINGS:
Table 1 – Trans-Guard OS and OS Shorty Fuse Catalog Information
Current
Rating
(Amps)
Trans -Guard OS
Cat. No.
Trans -Guard OS
Shorty Cat. No.
Nominal Voltage Rating - 8.3kV
30
35
Trans -Guard OS
Cat. No.
Trans -Guard OS
Shorty Cat. No.
Nominal Voltage Rating – 15.5kV or 17.2kV 1
Trans-Guard OS
Cat. No.
Nominal Voltage Rating – 23kV
HTSS240030
HTDS232035
Trans -Guard OS
Shorty Cat. No.
HTSS252030
HTDS242035
40
45
50
65
80
HTDS232040
HTSS232040
HTDS242040
HTDS242045
HTDS242050
HTDS242065
HTDS242080
HTSS240040
HTDS252040
HTSS252040
HTDS232050
HTDS232065
HTDS232080
HTSS232050
HTSS232065
HTSS232080
HTSS240050
HTSS242065
HTSS242080
HTDS252050
HTDS252065
HTSS252050
HTSS252065
HTSS252080
100
125
130
150
160
HTDS232100
HTDS332125
HTSS232100
HTSS232125
HTSS232065
HTSS232150
HTSS232080
HTDS242100
HTDS342125
HTSS242100
HTSS242125
HTSS242065
HTSS242150
HTSS242080
HTDS352100
HTDS352125
HTSS252100
165
175
200
200
250
HTDS332165
HTSS232165
HTDS342165
HTDS332200
HTSS232200
HTSS232100
HTDS342200
300
330
400
HTDS332150
HTDS232150
HTDS342150
HTSS252065
HTDS352150
HTSS252080
HTSS242165
HTDS352175
HTDS332125
HTDS342125
HTSS232150
HTSS232165
HTSS232200
HTDS342150
HTSS242100
HTSS242125
HTSS252100
HTSS242150
HTSS242165
Notes: ___ Shaded current ratings shown are achieved by using a parallel combination of two fuses (order two fuses).
1
See Tables 3a and 3b for specific Nominal Voltage Ratings.
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc.
1
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
DIMENSIONAL INFORMATION:
B
A
¼-20 threaded hole
½” deep
C
Table 2 – Trans-Guard OS and OS Shorty Fuse Dimensional Information
Nom. Voltage
Rating(kV)
Current
Rating
(Amps)
Dimensions
inches (millimeters)
A
B
C
Approx
.
Weight
(lbs)
Trans-Guard OS
35
8.3
40-100
125-200
35-45
15.5
40-100
125-200
40-65
23.0
100-175
6.13-6.05
(155.7-153.7)
9.93-9.85
(252.2-250.2)
7.21-7.09
(183.1-180.0)
11.01-10.89
(279.7-276.6)
2.22-2.18
(56.4-55.4)
2.22-2.18
(56.4-55.4)
9.97-9.89
(253.2-251.2)
11.01-10.89
(279.7-276.6)
3.32-3.25
(84.3-82.5)
9.93-9.85
(252.2-250.2)
15.53-15.45
(394.5-392.4)
15.57-15.49
(395.5-393.4)
11.01-10.89
(279.7-276.6)
16.61-16.49
(421.9-418.8)
16.61-16.49
(421.9-418.8)
2.22-2.18
(56.4-55.4)
2.22-2.18
(56.4-55.4)
3.32-3.25
(84.3-82.5)
15.53-15.45
(394.5-392.4)
18.37-18.29
(466.6-464.6)
16.61-16.49
(421.9-418.8)
19.41-19.29
(493.0-490.0)
2.22-2.18
(56.4-55.4)
3.32-3.25
(84.3-82.5)
2.25
3.25
7.25
3.25
4.75
10.75
4.75
12.0
Trans-Guard OS Shorty
40
8.3
50-100
125-200
30-50
15.5/17.2
65-100
125-165
30-50
23.0
65-100
6.13-6.05
(155.7-153.7)
6.72-6.64
(170.7-168.7)
9.93-9.85
(252.2-250.2)
7.21-7.09
(183.1-180.0)
7.80-7.68
(198.1-195.1)
11.01-10.89
(279.7-276.6)
2.22-2.18
(56.4-55.4)
2.22-2.18
(56.4-55.4)
2.22-2.18
(56.4-55.4)
8.21-8.13
(208.5-206.5)
11.05-10.97
(280.7-278.6)
15.53-15.45
(394.4-392.4)
11.72-11.64
(297.7-295.7)
9.29-9.17
(236.0-232.9)
12.13-12.01
(308.1-305.1)
16.61-16.49
(421.9-418.8)
12.80-12.68
(325.1-322.1)
2.22-2.18
(56.4-55.4)
2.22-2.18
(56.4-55.4)
2.22-2.18
(56.4-55.4)
2.22-2.18
(56.4-55.4)
15.33-15.25
(389.4-387.4)
16.41-16.29
(416.8-413.8)
2.22-2.18
(56.4-55.4)
2.25
2.5
3.25
2.75
3.75
4.75
3.75
4.75
Note: Other Hardware is available, consult the factory.
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc.
2
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
TECHNICAL SUMMARY:
The following table summarizes the Trans -Guard OS and OS Shorty fuse performance and electrical characteristics. Copies of
Certified Test Reports CTR-002 & CTR-009, which detail the specific interrupting tests conducted on these designs, are available
upon request or on our web site (www.hi-techfuses.com).
Table 3a – Electrical Characteristics of Trans-Guard OS and OS Shorty Fuses (Single Fuses)
Nominal
Voltage
Rating
(kV)
Current
Rating
(A)
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
23.0
23.0
23.0
23.0
23.0
23.0
23.0
35
40
50
65
80
100
125
150
165
200
35
40
45
50
65
80
100
125
150
165
200
40
50
65
100
125
150
175
HTDS232035
HTDS232040
HTDS232050
HTDS232065
HTDS232080
HTDS232100
HTDS332125
HTDS332150
HTDS332165
HTDS332200
HTDS242035
HTDS242040
HTDS242045
HTDS242050
HTDS242065
HTDS242080
HTDS242100
HTDS342125
HTDS342150
HTDS342165
HTDS342200
HTDS252040
HTDS252050
HTDS252065
HTDS352100
HTDS352125
HTDS352150
HTDS352175
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
40
50
65
80
100
125
150
165
200
HTSS232040
HTSS232050
HTSS232065
HTSS232080
HTSS232100
HTSS232125
HTSS232150
HTSS232165
HTSS232200
8.3
10.0
10.0
10.0
10.0
8.3
8.3
8.3
8.3
17.2
17.2
17.2
17.2
17.2
17.2
17.2
17.2
15.5
30
40
50
65
80
100
HTSS240030
HTSS240040
HTSS240050
HTSS242065
HTSS242080
HTSS242100
HTSS242125
HTSS242150
HTSS242165
HTSS252030
HTSS252040
HTSS252050
HTSS252065
HTSS252080
HTSS252100
Fuse
Model
Number
Rated
Peak Arc
Maximum
Voltage
Voltage
(kV)
(5)
(kV)
Trans-Guard OS
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
23.0
23.0
23.0
23.0
23.0
23.0
23.0
26
26
26
26
26
26
22
22
22
22
49
46
49
46
46
49
49
44
44
44
44
64
65
66
69
67
65
63
Minimum
I/C
(A)
Minimum
2
Melt I T
(A 2 S e c )
Maximum
Total I 2 T
(A 2 S e c )
(3) (4)
415
260
320
430
600
850
450
535
1,250
1,700
380
270
450
330
450
700
1,000
500
600
1,200
1,530
280
340
465
600
1,000
1,300
1,530
3,140
3,200
5,000
11,000
17,000
39,000
29,000
45,000
67,300
156,000
3,140
3,200
4,340
5,000
11,000
17,000
39,000
29,000
45,000
67,300
156,000
3,200
5,000
11,000
20,100
31,400
66,900
108,600
10,000
10,500
16,000
34,000
45,000
120,000
90,000
160,000
230,000
580,000
10,000
9,500
14,500
16,000
34,000
45,000
120,000
90,000
160,000
230,000
580,000
10,500
17,000
38,000
70,000
105,000
220,000
360,000
26
25
25
25
25
26
24.5
24
24
415
300
350
430
570
850
900
1020
1120
3,140
2,500
3,700
6,300
12,800
39,000
23,000
39,500
54,500
10,000
14,000
18,000
31,000
66,000
120,000
110,000
175,000
225,000
17.2
17.2
17.2
17.2
17.2
17.2
17.2
17.2
15.5
49
49
49
49
49
49
49
49
48
240
330
440
360
440
580
540
700
780
1,260
2,680
4,440
3,700
6,300
12,800
14,800
34,800
51,200
6,800
12,000
17,000
22,000
36,000
76,000
66,000
137,000
195,000
25.5
25.5
25.5
25.5
25.5
25.5
71
71
71
70
70
70
300
390
570
360
440
575
920
1,580
3,200
3,700
6,300
12,800
4,250
9,750
20,000
17,000
28,000
70,000
Trans-Guard OS Shorty
23.0
23.0
23.0
23.0
23.0
23.0
125
150
165
30
40
50
65
80
100
(1)
(1)
(1)
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc.
3
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
TECHNICAL SUMMARY (CONTINUED):
Table 3b – Electrical Characteristics of Trans-Guard OS & OS Shorty Fuses (Fuses tested for use in Parallel)
Nominal
Voltage
Rating
(kV)
Current
Rating
(A)
(2)
Fuse
Model Number
(Order Two Fuses)
Rated
Maximum
Voltage
(kV)
Peak Arc
Voltage
(kV)
(5)
Maximum
Total I 2 T
Minimum
I/C
(A)
Minimum
Melt I 2 T
(A 2 Sec)
850
1,000
116,000
180,000
350,000
650,000
850
1,000
116,000
180,000
350,000
650,000
2
(A Sec)
(3) (4)
Trans-Guard OS
8.3
250
HTDS332125
8.3
22
8.3
300
HTDS332150
8.3
22
15.5
250
HTDS342125
15.5
44
15.5
300
HTDS342150
15.5
44
Trans-Guard OS Shorty
8.3
130
HTSS232065
8.3
25
420
14,800
65,000
8.3
160
HTSS232080
8.3
25
500
25,200
114,000
8.3
8.3
8.3
8.3
200
300
330
400
HTSS232100
HTSS232150
HTSS232165
HTSS232200
8.3
8.3
8.3
8.3
25
24.5
24
23.5
630
1,900
2,150
2,380
51,200
92,000
158,000
218,000
240,000
425,000
675,000
850,000
17.2
130
HTSS242065
17.2
47
420
14,800
92,000
17.2
160
HTSS242080
17.2
47
500
25,200
162,000
17.2
200
HTSS242100
17.2
47
630
51,200
310,000
HTSS242125
17.2
49
1,130
59,200
265,000
HTSS242150
HTSS242165
15.5
15.5
49
46
1,500
1,670
139,200
204,800
515,000
733,000
(1)
17.2
250
15.5
15.5
300
330
23.0
130
HTSS252065
25.5
69
360
14,800
68,000
23.0
23.0
160
200
HTSS252080
HTSS252100
25.5
23.0
69
69
450
560
25,200
51,200
115,000
280,000
(1)
Notes to Table 3a and 3b:
1. These fuses have only been tested at a rated maximum interrupting current of 44,000 A rms
symmetrical due to test station limitations. All other fuses have a rated maximum interrupting
current of 50,000 A rms symmetrical.
2. ___ Current ratings shown in Table 3b are achieved by using a parallel combination of two fuses
(order two fuses). To facilitate equal sharing of the interrupting duty, the two fuses should be
resistance matched (±2%) and be mounted such that current paths to and from each fuses are
symmetrical.
3. Tabulated maximum total I2t values are at the nominal voltage of the fuse. Values for 17.2kV
fuses at 15.5kV are reduced by approximately 12%, while values for 8.3kV and 23kV fuses at
10kV and 25.5kV are increased by approximately 30% and13% respectively.
4. Maximum total I2t values are reduced for currents below 50,000 A. For example, at 10,000 A,
maximum total I2t values are approximately 15% less than the published values.
5. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed.
Reduced voltages and currents will reduce the peak arc voltage. Consult the factory for
information.
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc.
4
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
FUSE SELECTION:
For a detailed explanation on selecting the appropriate backup current limiting fuse for a given application,
please refer to Hi-Tech Fuses, Inc. Application Bulletin FS-10.
For a quicker method of selecting the proper Trans-Guard OS or OS Shorty fuse for applications involving
coordination with Bay-O-Net expulsion fuses and transformers having impedances equal to, or higher, than
those listed in Table 4, please refer to fuse coordination Tables 5-8. These tables include columns that
specify both OS and OS Shorty fuses for each application (Note: The suggested Trans-Guard OS rating
may differ from those shown in Tables II-V of OS Brochure PB8411 as different transformer impedances
have been assumed.) More comprehensive tables listing fusing alternatives for transformers having any
impedance can be found at www.hi-techfuses.com .
Table 4- Assumed Transformer Impedances Used for Fuse Coordination Tables IV-VII
Transformer
Size (KVA)
5
10
15
25
37.5
45
50
75
100
112.5
150
167
225
250
300
333
500
750 and up
1Φ
Impedances
(%)
1.90
1.90
1.90
1.90
1.90
-1.90
1.90
2.00
--2.60
-4.00
-5.00
5.00
5.75
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc.
3Φ
Impedances
(%)
-----1.60
-1.60
-1.80
2.00
-3.00
-3.50
-4.00
5.75
5
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
Notes:
Bay-O-Net fuse selection
is based on Cooper
Power Systems
recommendations.
Table 5 - 1Φ Transformer Coordination Table For Expulsion & Trans-Guard OS / OS Shorty Fuses
TRANS-GUARD OS / OS SHORTY FUSE VOLTAGE RATING (kV)
8.3
15.5/17.2
TRANSFORMER VOLTAGE (kV) PHASE-TO-GROUND
4.16-4.8
7.2-7.96
12-12.47
13.2-14.4
16.0
KVA
2.4
Link
OS
Dual Sensing
5
C03 35
10
C05 35
15
C08 50
25
C10 100
37.5 C12 165
50
C12 200
75
C 1 4 --1 0 0 C 1 4 --167
----250
----333
----500
-----
Shorty Link
OS
Shorty Link O S
a,c
Bay-O-Net (4000358___)
40
C03 3 5
40
C03
40
C05 3 5
40
C03
65
C05 3 5
40
C03
100 C08 5 0
65
C05
150 C10 8 0
100 C08
165 C10 1 0 0 125 C08
300 C12 1 6 5 150 C10
330 C12 2 0 0 165 C10
--C 1 4 --300 C12
--C 1 8 --330 C14
--C 1 8 --330 C14
--------C18
and
35
35
35
35
50
65
100
100
165
250
250
---
Current Sensing Bay-O-Net (4000353___)
5
10
15
25
37.5
50
75
100
167
250
333
500
C04 35
C06 35
C08 35
C10 65
C10 80
C12 100
C14 165
C14 200
C 1 7 ---------------
Dual Element
5
C03 35
10
C05 35
15
C07 50
25
C09 80
37.5 C11 100
50
C12 100
75
----100
----167
----250
----333
-----
40
40
40
80
100
125
165
200
300
-------
C04
C04
C06
C08
C08
C10
C12
C12
C14
C16
C17
---
35
35
35
35
50
80
100
150
165
200
300
---
40
40
40
40
65
100
125
150
165
200
300
---
C04
C04
C04
C06
C06
C08
C10
C10
C12
C14
C16
C17
Shorty Link
a,b
Shorty Link
OS
19.9
Shorty Link
OS
Shorty Link
OS
Shorty
OS / OS Shorty Fuse Coordinations
40
C03 35
30
C03 35
30
C03
40
C03 35
30
C03 35
30
C03
40
C03 35
30
C03 35
30
C03
40
C03 35
30
C03 35
30
C03
50
C05 35
30
C05 35
30
C03
65
C05 35
30
C05 35
30
C05
100 C08 50
65
C08 50
50
C08
125 C08 65
80
C08 65
65
C08
150 C10 100 100 C10 100 1 0 0 C10
200 C12 125 125 C12 125 1 2 5 C10
200 C12 125 125 C12 125 1 2 5 C12
330 C14 250 165 C14 250 1 6 5 C12
-------------------------
30
30
30
30
30
30
50
65
100
100
125
125
C03 40
C03 40
C03 40
C03 40
C03 40
C05 40
C05 40
C05 40
C08 50
C10 65
C10 100
C12 100
30
30
30
30
30
30
30
40
65
80
80
130
C04
C04
C04
C04
C04
C06
C06
C08
C10
C10
C12
C14
-------------------------
30
30
30
30
30
30
30
40
65
65
100
150
C04 40
C04 40
C04 40
C04 40
C04 40
C04 40
C06 40
C06 40
C08 40
C10 50
C12 100
C12 100
30
30
30
30
30
30
30
30
40
65
80
100
OS / OS Shorty Fuse Coordinations
40
C03 35
30
C03 35
30
C03
40
C03 35
30
C03 35
30
C03
40
C03 35
30
C03 35
30
C03
40
C03 35
30
C03 35
30
C03
40
C05 35
30
C04 35
30
C03
50
C06 35
40
C05 35
30
C04
100 C07 45
50
C06 35
40
C06
100 C09 65
80
C07 50
65
C07
125 C11 80
100 C09 65
80
C07
--C12 80
100 C11 80
100 C09
--C12 100 100 C12 80
100 C12
-----------------------
30
30
30
30
30
30
40
50
65
80
100
C03
C03
C03
C03
C03
C03
C05
C06
C07
---
and OS / OS Shorty Fuse Coordinations
35
35
35
35
35
35
65
80
100
150
200
300
a,c
OS
23.0
Bay-O-Net (4038108___)
and
40
C03 3 5
40
C03 35
40
C04 3 5
40
C03 35
50
C05 3 5
40
C03 35
100 C06 3 5
40
C04 35
125 C09 6 5
80
C06 35
125 C09 8 0
100 C07 50
--C12 1 0 0 125 C09 80
--C12 1 0 0 125 C09 80
--------C12 100
-------------------------
40
40
40
40
40
40
80
100
125
150
200
300
C04 35
C04 35
C04 35
C04 35
C06 35
C06 35
C08 35
C08 35
C10 65
C12 100
C14 150
C14 150
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc
30
30
30
30
30
30
40
50
80
100
150
150
C04 35
C04 35
C04 35
C04 35
C06 35
C06 35
C08 35
C08 35
C10 65
C12 80
C12 80
C14 150
30
30
30
30
30
30
40
40
80
100
100
150
Bay-O-Net fuses are
selected to meet inrush
criteria of 12 times
transformer full load
current for 0.1 second.
Backup OS / OS “Shorty”
fuses are selected to
melt only on internal
transformer faults, where
transformer impedance
is equal, to or greater
than, the value given in
Table III. If the
impedance is higher, a
smaller fuse can often be
used.
Shaded areas
indicate parallel fuse
applications.
a
Or equivalent bayonet
link (ABB & ERMCO).
b
Current Sensing BayO-Net fuses are selected
to melt with 3 to 4 times
transformer full load
current at 300 seconds.
c
40
40
40
40
40
40
40
40
50
-----
30
30
30
30
30
30
30
40
50
---
Dual Sensing and
Dual Element Bay-O-Net
fuses are selected to
limit transformer load to
approximately 160%
for 7 hours and 200% for
2 hours with the
transformer initially
carrying 75% of load at
an ambient temperature
of 35°C.
6
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
Table 6- 3Φ Transformer Coordination Table For Expulsion & Trans-Guard OS / OS Shorty Fuses
TRANS-GUARD OS / OS SHORTY FUSE VOLTAGE RATING (kV)
15.5/17.2
TRANSFORMER VOLTAGE (kV) PHASE-TO-PHASE
8.3
KVA
2.4
4.16-4.8
7.2-7.96
12-12.47
d
13.2-14.4
d
20.8
Bay-O-Net fuse selection is
based on Cooper Power
Systems recommendations.
23.0
d
23.0
24.9
Notes:
d
27.6
34.5
Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty
Dual Sensing Bay-O-Net (4000358___)
45
75
112.5
150
225
300
500
750
1000
1500
2000
C10 100
C12 200
C14 --C14 --C18 --C18 ----- ----- ----- ----- ----- ---
125
165
300
300
400
400
-----------
C08 65
C10 100
C12 165
C12 200
C14 300
C14 300
C18 --C18 ----- ----- ----- ---
65
125
150
165
300
300
400
400
-------
a,c
C05
C08
C08
C10
C12
C12
C14
C18
C18
-----
35
65
65
100
125
150
250
300
-------
Current Sensing Bay-O-Net (4000353___)
45
75
112.5
150
225
300
500
750
1000
1500
2000
2500
C10 80
C12 100
C12 165
C14 165
C16 200
C17 300
--- ----- ----- ----- ----- ----- ---
100
125
165
165
200
300
-------------
C08 35
C10 80
C10 80
C12 100
C14 150
C14 150
C17 300
C17 300
--- ----- ----- ----- ---
40
100
100
125
150
150
300
300
---------
C06
C06
C08
C10
C10
C12
C14
C16
C17
-------
45
75
112.5
150
225
300
500
750
1000
C09 80
C12 100
--- ----- ----- ----- ----- ----- ----- ---
100
125
---------------
C07 50
C09 80
C11 100
C12 100
--- ----- ----- ----- ----- ---
65
100
125
125
-----------
C04
C06
C07
C09
C11
C12
-------
a,b
35
35
50
80
80
100
150
200
300
-------
a,c
Dual Element Bay-O-Net (4038108___)
and OS / OS Shorty Fuse Coordinations
40
65
80
125
150
150
200
330
330
-----
C03
C05
C08
C08
C10
C10
C12
C14
C14
35
35
50
65
80
80
125
250
250
d
C18 ----- ---
30
30
50
65
100
100
125
150
165
300
---
C03
C05
C08
C08
C10
C10
C12
C14
C14
35
35
50
50
80
80
125
150
250
d
C18 300
--- ---
30
30
50
65
80
100
125
150
165
300
---
C03
C03
C05
C05
C08
C08
C10
C12
C12
C14
---
35
35
35
35
40
40
80
125
125
250
---
30
30
30
30
50
50
80
125
125
165
---
C03
C03
C05
C05
C08
C08
C10
C12
C12
C14
C14
35
35
35
35
40
40
65
125
125
250
250
30
30
30
30
50
50
80
125
125
150
165
C03
C03
C05
C05
C08
C08
C10
40
40
40
40
40
40
65
e
C12 100
e
C12 100
e
C14 ----- ---
30
30
30
30
65
65
80
130
130
200
---
C03 40
C03 40
C05 40
C05 40
C08 40
C08 40
C10 65
C10 65
C12 100
C14 --C14 ---
30
30
30
30
65
65
80
80
130
200
200
C03 40
C03 40
C03 40
C05 40
C05 40
C05 40
C08 40
C10 65
C10 65
C12 100
C14 ---
30
30
30
30
30
30
65
80
80
130
200
C04
C06
C06
C08
C10
C10
C12
C14
C14
C16
---
35
35
35
35
65
65
100
150
150
200
-----
30
30
40
40
65
80
125
150
150
250
---
C04
C06
C06
C08
C10
C10
C12
C14
C14
C16
35
35
35
35
50
65
100
150
150
200
e
C17 300
-- ---
30
30
30
40
65
65
100
150
150
250
300
--
C04
C04
C06
C06
C08
C08
C10
C12
C12
C14
C16
35
35
35
35
35
35
65
80
80
150
200
e
C17 300
30
30
30
30
40
40
65
80
100
150
250
300
C04
C04
C04
C06
C08
C08
C10
C12
C12
C14
C16
C16
35
35
35
35
35
35
50
80
80
150
200
200
30
30
30
30
30
30
65
80
100
150
250
250
C04
C04
C04
C06
C08
C08
C10
C12
C12
40
40
40
40
40
40
50
100
100
e
C14 125
e
C16 ---- ---
30
30
30
30
30
30
65
80
100
160
200
--
C04 40
C04 40
C04 40
C06 40
C06 40
C08 40
C10 50
C10 50
C12 100
C14 125
C14 125
-- ---
30
30
30
30
30
30
65
65
80
160
160
--
C04 40
C04 40
C04 40
C04 40
C06 40
C06 40
C08 40
C10 40
C12 100
C12 100
C14 125
-- ---
30
30
30
30
30
30
30
65
80
100
160
--
C03
C03
C04
C05
C06
C07
----
30
30
30
30
40
50
----
C03
C03
C03
C04
C06
C07
----
30
30
30
30
40
50
----
C03
C03
C03
C03
C05
C06
C07
---
30
30
30
30
30
40
50
---
and OS / OS Shorty Fuse Coordinations
35 40 C03 35 30
35 40 C04 35 30
65 65 C06 35 40
80 100 C07 50 50
80 100 C09 65 65
100 125 C09 65 80
--- --- C12 100 100
--- ---- --- ---- ---- --- --
C03
C04
C06
C07
C09
C09
C12
---
35 30 C03 35 30 C03
35 30 C03 35 30 C03
35 40 C05 35 30 C04
45 50 C06 35 40 C05
65 65 C07 35 50 C06
65 80 C09 50 65 C07
80 100 C11 65 80 C09
--- -- C12 80 100 C11
--- --- --- -- C12
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc
Backup OS / OS “Shorty” fuses
are selected to melt only on
internal transformer faults,
where transformer impedance
is equal to, or greater than, the
value given in Table III. If the
impedance is higher, a smaller
fuse can often be used.
Shaded areas indicate
parallel fuse applications.
a
Or equivalent bayonet link
(ABB & ERMCO).
b
and OS / OS Shorty Fuse Coordinations
40
40
65
100
100
125
150
200
300
-------
Bay-O-Net fuses are selected
to meet inrush criteria of 12
times transformer full load
current for 0.1 second.
35 30
35 30
35 30
35 30
35 30
35 50
65 65
65 80
80 100
40
40
40
40
40
40
-------
40
40
40
40
40
40
-------
40
40
40
40
40
40
40
-----
Current Sensing Bay -O-Net
fuses are selected to melt with
3 to 4 times transformer full
load current at 300 seconds
c
Dual Sensing and Dual
Element Bay-O-Net fuses are
selected to limit transformer
load to approximately 160% for
7 hours and 200% for 2 hours
w ith the transformer initially
carrying 75% of load at ambient
temperature of 35°C.
d
Applications are limited to
gnd Y-gnd Y connected
transformers with no more than
50% delta connected
secondary load. Phase-toground rated fuses are
frequently recommended for
gnd Y-gnd Y connected
transformers.
e
Bay-O-Net assembly may be
subjected to damage during
fault clearing at currents above
the Bay-O-Net’s Maximum I/C.
7
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
Table 7 - 1Φ Transformer Coordination Table For
Cooper High Ampere Overload Bay-O-Net (4038361___CB) & Trans-Guard OS / OS Shorty Fuses
KVA
TRANS-GUARD OS / OS SHORTY FUSE VOLTAGE RATING (kV)
8.3
15.5/17.2
TRANSFORMER VOLTAGE (kV) PHASE-TO-PHASE
2.4
4.16-4.8
7.2-7.96
12-12.47
13.2-14.4
Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty
75
100
167
250
333
500
833
C03 200
C03 200
C04 200
C05 300
--- ----- ----- ---
165
200
300
300
-------
--- ----- --C03 165
C04 200
C05 200
C05 300
--- ---
--- --- --- --- --- --- ------- --- --- --- --- --- ----165 --- --- --- --- --- ----165 --- --- --- --- --- ----300 C03 150 150 --- --- ----300 C04 200 165 C03 125 125 C03
--- C05 300 300 C04 165 165 C04
--- ----- ----- ----- ----- --125 125
165 150
Table 8 - 3Φ Transformer Coordination Table For
Cooper High Ampere Overload Bay-O-Net (4038361___CB) & Trans-Guard OS / OS Shorty Fuses
TRANS-GUARD OS / OS SHORTY FUSE VOLTAGE RATING (kV)
8.3
15.5/17.2
TRANSFORMER VOLTAGE (kV) PHASE-TO-PHASE
KVA
2.4
4.16-4.8
7.2-7.96
12-12.47
13.2-14.4
a
20.8
24.9
a
Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty
112.5
150
225
300
500
750
1000
1500
2000
2500
C03 165
C03 165
C04 200
C04 200
C05 ----- ---- ----- ----- ----- ---
165 --- --- --- --- --165 --- --- --- --- --200 --- --- --- --- --300 C03 150 150 --- --300 C04 200 200 C03 150
--- C05 200 300 C04 165
--- --- --- --- C05 200
--- --- --- --- C05 300
--- --- --- --- --- ----- --- --- --- --- ---
--------150
150
200
300
-----
----------C03
C04
C04
C05
b
C05
----------125
165
200
200
300
----------125
150
165
250
300
--- ----- ----- ----- ----- ----- --C03 125
C04 165
C05 200
b
C05 300
----- --- --- --- --- ------- --- --- --- --- ------- --- --- --- --- ------- --- --- --- --- ------- --- --- --- --- ------- --- --- --- --- --125 --- --- --- --- --- --165 C03 125 125 C03 125 125
250 C04 165 150 C04 165 150
300 C04 165 165 C04 165 150
Notes:
Ø Bay-O-Net fuse selection is based on Cooper Power Systems recommendations.
Ø Bay-O-Net fuses are selected to meet inrush criteria of 12 times transformer full load current for 0.1 second.
Ø Backup OS Shorty & OS fuses are selected to melt only on internal transformer faults, where transformer
impedance is equal to, or greater than, the value given in Table 4. If the impedance is higher, a smaller fuse
can often be used.
Ø
Shaded areas indicate parallel fuse applications.
Ø High Ampere Overload Bay-O-Net fuses are selected to limit transformer load to approximately 160% for 7
hours and 200% for 2 hours with the transformer initially carrying 75% of load at ambient temperature of 35°C.
a
Applications are limited to gnd Y-gnd Y connected transformers with no more than 50% delta connected
secondary load. Phase-to-ground rated fuses are frequently recommended for gnd Y-gnd Y connected
transformers.
b
Bay-O-Net assembly may be subjected to damage during fault clearing at currents above the Bay-O-Net’s
maximum I/C.
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc
8
Trans-Guard OS and OS Shorty Oil-Submersible Backup Type Current-Limiting Fuses
NOTES :
No warranty or representation, expressed or implied, including any implied warranty of merchantability or fitness for a particular purpose regarding the product described
herein is extended by anything contained in this brochure. Hi-Tech Fuses, Inc. neither assumes nor authorized any other person, firm or entity to assume for it any liability in
connection with the sale or use of the product described in this brochure. Any such warranties or other terms and conditions of sale of products shall be in accordance with
Hi-Tech Fuses, Inc. standard terms and conditions of sale for such products, which are available on request.
Hi-Tech Fuses, Inc.
415 19th St. Dr. SE, Hickory, NC 28602
Phone: 828-322-1855 Fax: 828-322-2376 Email: hi-tech@hi-techfuses.com Internet: www.hi-techfuses.com
January 2005 • Supersedes February 2003 • 2005 Hi-Tech Fuses, Inc
9