FX Full-Range
CL Fuses
14
PROTECTION AND CONTROL
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PG-PC-H-0307
Trans-Guard™ FX Fuses
• Installed in Elastimold MCAN rubber
molded canister for dead-front/submersible
applications (see page 47)
• Installed directly in oil (contact factory for
more information)
Figure 1
Patented Damage Sensor
Rugged machined brass end caps
Hermetically sealed construction
Designed to significantly reduce the risk of fuse failure should
the fuse be subjected to an element damaging current surge
Ensures that no gasses escape from the fuse during current
interruption. All Trans-Guard™ FX fuses are helium mass
spectrometer leak tested to ensure sealing system integrity
Used for greater ferrule strength resulting in less distortion and
more secure fuse attachment in dry-well canisters
FEATURE BENEFIT/DESCRIPTION
Tested in accordance with the most recent ANSI/IEEE standards
Includes requirements for short circuit testing at the
manufacturer’s specified rated maximum application
temperature (RMAT)
The Trans-Guard™ FX full-range current-
limiting fuse provides both overload and fault
current protection for distribution equipment
in a single fuse body. As a full-range fuse,
it is capable of interrupting any continuous
current between the minimum current that
can cause melting of its elements and its
rated maximum interrupting current (50,000
amps). The fuses are capable of interrupting
Applications:
Trans-Guard™ FX fuses are available in a
broad range of ratings. For ease of application,
all designs are compatible with the industry-
recognized standard mounting codes. Common
applications include the Trans-Guard™ FX:
• Installed in drywell canisters for distribution
transformer protection (see Figure 1)
• Clip mounted in live-front switchgear (see
Figure 2)
• Externally mounted on overhead distribution
systems (several outdoor versions available
– contact factory for more information)
Figure 2
in elevated ambient temperatures up to their
rated maximum application temperature
(RMAT). The Trans-Guard™ FX fuse is
hermetically sealed and thus discharges no
gasses during fuse operation. An additional
design distinction is its Patented Damage
Sensor that significantly reduces the
potential for fuse failure in the event of
element damaging current surges.
Optional blown fuse indicator (See Figure 3) Reliable indication of fuse operation with a unique design
that does not affect the fuse’s arcing performance
Nominal Fuse
Voltage Rating (kV)
Current Rating
(Amps)
Dimensions inches (mm) Standard
Mounting Code
A B C
5.5 80-200 3.32-3.25”
(84.4-82.5mm)
17.51-17.35”
(444.8-440.7mm)
1.21-1.17”
(30.7-29.7mm) 6
8.3
3-50 2.25-2.18”
(57.0-55.3mm)
10.00-9.90”
(254.0-251.5mm)
1.02-1.00”
(25.9-25.4mm) 4
65-80 2.25-2.18”
(57.0-55.3mm)
14.31-14.21”
(363.5-360.9mm)
1.02-1.00”
(25.9-25.4mm) 5
65-125 3.32-3.25”
(84.4-82.5mm)
14.70-14.54”
(373.4-369.3mm)
1.21-1.17”
(30.7-29.7mm) 5
15.5
3-50 2.25-2.18”
(57.0-55.3mm)
14.31-14.21”
(363.5-360.9mm)
1.02-1.00”
(25.9-25.4mm) 5
65-100 3.32-3.25”
(84.4-82.5mm)
17.51-17.35”
(444.8-440.7mm)
1.21-1.17”
(30.7-29.7mm) 6
23.0 6-50 2.25-2.18”
(57.0-55.3mm)
17.12-17.02”
(434.8-432.3mm)
1.02-1.00”
(25.9-25.4mm) 6
TABLE 12 – DIMENSIONAL INFORMATION FOR TRANS-GUARD™ FX FUSES
CONSTRUCTION
FX Full-Range
CL Fuses
15
PROTECTION AND CONTROL
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PG-PC-H-0307
Trans-Guard™ FX Fuses
BLOWN FUSE INDICATOR
Figure 3
Before Operation After Operation
Nominal
Fuse
Voltage
Rating
(kV)
Fuse
Diameter
(in)
Current
Rating
(Amps)
Fuse
Catalog
Number
Rated
Maximum
Voltage
(kV)
Maximum Continuous
Current (In Air)
(6)
Peak Arc
Voltage
(5)
(kV)
Minimum
Melt I2t
(AMP2
-SEC)
Maximum
Melt I2t
(3) (4)
(AMP2
-SEC)
RMAT
(8)
(°C)
25°C 40°C 55°C
5.5 3.3
80
HTFX320080
5.5
99 96 94 15.0 22,100 110,000
71
100
HTFX320100
126 122 118 15.0 56,700 280,000
125
HTFX320125
142 138 134 15.0 78,300 380,000
150
HTFX320150
184 178 173 15.0 176,000 860,000
200
HTFX320200
208 202 196 15.0 259,000 1,270,000
8.3
2.2
3
HTFX230003
10.0
5.0 4.9 4.7 30 100 350
140
6
HTFX230006
11.0 10.5 10.0 32 620 2,700
8
HTFX230008
13.5 13.0 12.5 28 800 4,000
10
HTFX230010
16.0 15.5 15.0 28 800 4,000
12
HTFX230012
20.5 19.5 19.0 26 920 8,000
18
HTFX230018
23.5 22.5 22.0 26 1,310 9,500
20
HTFX230020
27.5 26.5 25.5 26 1,620 11,000
25
HTFX230025
37.0 35.5 34.5 26 3,660 22,000
30
HTFX230030
41.0 39.5 38.5 26 5,250 30,000
40
HTFX230040
50.0 48.5 47.0 26 8,700 50,000
50
HTFX230050
57.0 55.0 53.5 26 12,800 70,000
65
HTFX230065
8.8 87.0 84.0 81.5 23 34,000 200,000
80
HTFX230080
100.0 98.0 95.0 22 51,200 280,000
71
3.3
65
HTFX330065
8.3
81.0 79.0 77.0 25 25,200 100,000
80
HTFX330080
95.0 92.0 89.0 25 47,200 185,000
100
HTFX330100
120.0 117.0 113.0 25 78,300 330,000
125
HTFX330125
135.0 131.0 127.0 25 115,150 480,000
15.5
2.2
3
HTFX240003
17.2
5.0 4.9 4.7 51 100 510
140
6
HTFX240006
11.0 10.5 10.0 54 620 2,600
8
HTFX240008
13.5 13.0 12.5 46 800 3,700
10
HTFX240010
16.0 15.5 15.0 46 800 3,700
12
HTFX240012
20.5 19.5 19.0 43 920 6,500
18
HTFX240018
23.5 22.5 22.0 45 1,310 8,000
20
HTFX240020
27.5 26.5 25.5 45 1,620 10,000
25
HTFX240025
37.0 35.5 34.5 45 3,660 22,000
30
HTFX240030
41.0 39.5 38.5 45 5,250 30,000
40
HTFX240040
50.0 48.5 47.0 45 8,700 50,000
50
HTFX240050
53.0 51.5 50.0 45 12,800 70,000
3.3
65
HTFX340065
15.5
78.0 75.0 73.0 40 25,200 110,000
7180
HTFX340080
88.0 85.0 82.0 40 39,400 185,000
100
HTFX340100
114.0 110.0 107.0 40 80,000 380,000
23.0 2.2
6
HTFX250006
23.0
11.0 10.5 10.0 67 620 3,100
140
8
HTFX250008
13.5 13.0 12.5 61 800 4,800
10
HTFX250010
16.0 15.5 15.0 61 800 4,800
12
HTFX250012
20.5 19.5 19.0 60 920 8,300
18
HTFX250018
23.5 22.5 22.0 60 1,310 11,200
20
HTFX250020
27.5 26.5 25.5 60 1,620 13,000
25
HTFX250025
37.0 35.5 34.5 60 3,660 28,000
30
HTFX250030
41.0 39.5 38.5 60 5,250 38,000
40
HTFX250040
48.0 46.5 45.0 60 8,700 61,000
50
HTFX250050
55.0 53.0 51.5 60 12,800 82,000
TABLE 13 – ELECTRICAL CHARACTERISTICS OF TRANS-GUARD™ FX FUSES (SINGLE FUSES)
FX Full-Range
CL Fuses
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PG-PC-H-0307
Trans-Guard™ FX Fuses
Nominal
Fuse
Voltage
Rating
(kV)
Fuse
Diameter
(in)
Current
Rating
(Amps)
Fuse
Catalog
Number
Rated
Maximum
Voltage
(kV)
Maximum Continuous
Current (In Air)
(6)
Peak Arc
Voltage
(5)
(kV)
Minimum
Melt I2t
(AMP2
-SEC)
Maximum
Melt I2t
(3) (4)
(AMP2
-SEC)
RMAT
(8)
(°C)
25°C 40°C 55°C
8.3
2.2
60
HTFX230030
10.0 80.0 77.0 75.0 26 21,000 120,000
140
80
HTFX230040
98.0 95.0 92.0 26 34,000 180,000
100
HTFX230050
8.3 111.0 108.0 105.0 24 51,200 250,000
130
HTFX230065
8.8 170.0 165.0 160.0 22 136,000 670,000
160
HTFX230080
198.0 191.0 186.0 21 204,800 890,000 40
3.3
130
HTFX330065
8.3
158.0 154.0 151.0 24 100,800 400,000
71
160
HTFX330080
186.0 180.0 175.0 24 189,000 740,000
200
HTFX330100
235.0 229.0 221.0 24 313,000 1,300,000
250
HTFX330125
265.0 256.0 249.0 24 460,500 1,800,000
15.5
2.2
60
HTFX240030
17.2
80.0 77.0 75.0 45 21,000 110,000
14080
HTFX240040
98.0 95.0 92.0 45 34,800 170,000
100
HTFX240050
104.0 101.0 98.0 45 51,200 310,000
3.3
130
HTFX340065
15.5
152.0 147.0 143.0 39 100,800 440,000
71160
HTFX340080
172.0 167.0 160.0 39 157,500 740,000
200
HTFX340100
222.0 214.0 208.0 39 320,000 1,520,000
TABLE 14 – ELECTRICAL CHARACTERISTICS OF TRANS-GUARD™ FX FUSES (PARALLEL FUSES)
NOTES FOR TABLES 13 AND 14:
1. Designs have a 50,000 Amps rms. Symmetrical Rating (except 3A 17.2 kV which was tested at 44 kA maximum).
2. Current ratings shown in Table 14 are achieved by using a parallel combination of two fuses (order two fuses). To facilitate equal shar-
ing of the interrupting duty, the two fuses should be resistance matched (± 2%) and be mounted such that the current paths to and from
each fuse are symmetrical.
3. Tabulated Maximum Total I2t values are for currents of 50,000 amperes at the nominal voltage of the fuse (except for fuses having a rated
maximum voltage of 8.8kV, in which case the maximum total I2t values are at 8.8kV). Fuses that have a rated maximum voltage higher
than their nominal voltage rating will have a higher I2t let-through when applied at voltages up to these higher values. For example, maxi-
mum total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV
fuses are used at 17.2 kV.
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 currents and voltages will reduce the
peak arc voltage. Consult the factory for further information.
6. Maximum continuous currents at higher ambient temperatures, and in conning enclosures:
• These may be determined by derating the fuses by 0.2% per degree C over 25°C (for example at 85°C the derating would be
60 x .2 = 12%, making the maximum continuous current of a 30 A fuse 41 x .88 = 36.1 A).
• When fuses are applied in a conning enclosure, such as a drywell canister, additional derating of a fuse’s maximum continuous
current is necessary. Specically, the maximum continuous current for fuses used in a dry-well canister, with the canister completely
submerged in oil, will be reduced by an additional 2% (3% for fuses having a rated maximum voltage of 8.8kV). When calculating
the derating for temperature, as described above, the temperature of the oil surrounding the canister should be used. For other
types of enclosures, please consult the factory.
7. Reduction in the long time melting current of the fuses (approximately one hour and longer) due to higher ambient temperatures and use in
enclosures is the same as described above for “maximum continuous currents”. See time-current characteristics for melting characteristics
in this time region.
8. The 2.2” dia. 80A and 160A (paralleled 80A) fuses have an RMAT of 140°C at a reduced rated maximum voltage of 5.5kV.
FX Full-Range
CL Fuses
17
PROTECTION AND CONTROL
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PG-PC-H-0307
Trans-Guard™ FX Fuses
Recommended Fuse Current Ratings (Amperes)
1-Phase
Transformer
kVA
Transformer 1-Phase Voltage Rating (kV) Phase-to-Ground
2.4 4.16 4.8 7.2 7.62 12 14.4 16 19.9
A B A B A B A B A B A B A B A B A B
10 6b8 6a3 3a3a3a3a3a6a
15 8 12 6 6 3 3 3a3a3a6a
25 18 20 8 12 8b10 6 6 3 3 3 6a
37.5 20 30 12 18 12b18 8 10 8 6 6a6a6a
50 30 40 18 20 18 20 10 12 10 12 6 6 6 6a
75 50 80 25 40 20 30 12 20 12 20 8 12 8 10 8 6
100 60 80 30 50 25 40 20 25 20 25 12b18 10 12 10b12 8
167 100 60 80 50 80 30 50 30 50 20 25 18 25 18 20 12 18
250 80 80 50 60 50 60 25 40 20 40 20 30 18 25
333 100 60 100 60 100 40 60 30 50 25 40 20 30
500 60 80 50 80 40 60 40 50
750 80 80 60 100
1000 100
FuseVoltage 8.3kV 15.5kV 23kV
TABLE 15 – RECOMMENDED TRANS-GUARD™ FX MOUNTED IN A STANDARD DRYWELL CANISTER IN OIL (AT A MAX. OIL TEMP. OF 100°C)
NOTES FOR TABLES 15 AND 16:
Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating.
Fuses recommended in Table 16 must be mounted in a 15.5kV mounting code 5 drywell canister.
Recommended fuses meet inrush criteria of 12 times transformer full load current for 0.1 second and 25 times transformer full load current for 0.01 second.
Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds.
Shaded areas indicate parallel fuse applications.
a Fuse allows greater than 300% of transformer rating.
b. Fuse allows greater than 200% of transformer rating.
Recommended Fuse Current Ratings (Amperes)
1-Phase
Transformer
kVA
Transformer 1-Phase Voltage Rating (kV) Phase-to-Ground
2.4 4.16 4.8 7.2 7.62
A B A B A B A B A B
75 80
100 65 80
167 X* 160 65 80 80
250 160 80 130 80 130 65 65
333 130 160 X* 160 65 X* 65 X*
500 160 160 130 130
FuseVoltage 8.3kV
TABLE 16 – RECOMMENDED 8.3KV TRANS-GUARD™ FX MOUNTED IN
15.5KV DRYWELL CANISTER IN OIL (AT A MAX. OIL TEMP. OF 100°C)
*X=Use an 8.3kV Drywell Canister. See Table 15 for fuse recommendations.
FX Full-Range
CL Fuses
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PROTECTION AND CONTROL
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PG-PC-H-0307
Trans-Guard™ FX Fuses
Recommended Fuse Current Ratings (Amperes)
3-Phase
Transformer
kVA
Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase
2.4 4.16 4.8 7.2-7.96 8.32 12.47 13.2-14.4 20.8 22.9-24.9c34.5c
A B A B A B A B A B A B A B A B A B A B
15 6 3 3 3a3a3a3a6a6a6a
22.5 8 10 6 6a3 3 3a3a6a6a6a
30 10 18 6 6 6a3 3a3a6a6a6a
45 18 20 8 12 8b10 6 6 3 3 6a6a6a
75 25 40 18 20 12 18 8 12 8b10 6 6 6a6a6a
100 40 50 20 25 18 20 12b18 10 12 8 6 8 6a6a6a
112.5 40 60 20 30 20 25 12 18 12b18 8b10 8 6 6a6a
150 50 80 25 40 25 40 18 20 18 20 10 18 10b12 6 6 6a
200 80 100 40 60 30 50 20 30 20 25 12 20 12b18 8 10 8 6
225 80 40 60 40 60 25 40 20 30 18 20 12 20 8 12 8 10 6
300 60 80 50 80 30 50 30 40 20 25 20 25 12 18 12b18 8
500 100 80 60 80 50 80 30 50 30 40 20 25 18 25 12 18
750 80 80 50 80 50 60 25 40 25 40 18 25
1000 60 100 60 80 40 40 20 30
1500 100 50 40
2000 50
TABLE 17 – RECOMMENDED TRANS-GUARD™ FX MOUNTED IN A STANDARD DRYWELL CANISTER IN OIL (AT A MAX. OIL TEMP. OF 100°C)
NOTES FOR TABLES 17 AND 18:
Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating.
Fuses recommended in Table 18 must be mounted in a 15.5kV mounting code 5 drywell canister.
Recommended fuses meet inrush criteria of 12 times transformer full load current for 0.1 second and 25 times transformer full load current for 0.01 second.
Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds.
Shaded areas indicate parallel fuse applications.
a Fuse allows greater than 300% of transformer rating.
b Fuse allows greater than 200% of transformer rating.
c Recommendations limited to gndY-gndY transformers with no more than 50% delta connected secondary load. Phase-to-ground rated fuses are frequently
recommended for gndY-gndY three phase transformers. In some cases, the fuses recommended in Table 18 may be suitable for use with transformers that
are not gndY-gndY (contact the factory further information).
Recommended Fuse Current Ratings (Amperes)
3-Phase
Transformer
kVA
Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase
2.4 4.16 4.8 7.2-7.96 8.32
A B A B A B A B A B
112.5 65
150 80
200 80 X* 65
225 80 130 65 65
300 130b160 65 80 80
500 160 X* 160 80 130 65 80c80c
750 160 130 80c130 80c130
1000 160 130 160c130b160c
1500 160c130
FuseVoltage 8.3kV
TABLE 18 – RECOMMENDED 8.3KV TRANS-GUARD™ FX MOUNTED IN
15.5KV DRYWELL CANISTER IN OIL (AT A MAX. OIL TEMP. OF 100°C)
*X=Use an 8.3kV Drywell Canister. See Table 17 for fuse recommendations.
FuseVoltage 8.3kV 15.5kV 23kV
FX Full-Range
CL Fuses
19
PROTECTION AND CONTROL
Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility
PG-PC-H-0307
Trans-Guard™ FX Fuses
Recommended Fuse Current Ratings (Amperes)
3-Phase
Transformer
kVA
Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase
2.4 4.16 4.8 7.2-7.96 8.32 12.47 13.2-14.4 20.8 22.9-24.9c34.5c
A B A B A B A B A B A B A B A B A B A B
15 6 3 3 3a3a3a3a6a6a6a
22.5 8 6a6a3a3a3a3a6a6a6a
30 10b12 6 6 6a3 3a3a6a6a6a
45 12 18 8 8 6a6a3 3 6a6a6a
75 20 40 12 18 12b18 8 8 6 6a6a6a6a
100 25 40 18 20 18 20 12 10b12 8 6 6a6a6a
112.5 30 50 20 25 18 20 12b18 12 8 8 6a6a6a
150 40 (65) 25 30 20 25 18 20 12 18 10b12 8b10 6 6 6a
200 (65) (80) 30 50 25 40 20 25 18 20 12b18 12b18 8 8 6a
225 (65) 100 40 (65) 40 50 25 30 20 30 12 18 12b18 8 10 8 6
300 (80)
(130)
50 (80) 40 (65) 25 40 25 30 18 20 18 20 12 10 12 8
500
(160)
250 (80)
(130)
(80) 125 50 (65) 40 (65) 25 40 25 40 18 25 18 25 12b18
750 250
(130)
200 125
(160)
(65) 100 (65) (80) 40 65 40 65 25 40 20 40 18 25
1000 200 250
(160)
250 100
(130)
(80)
(130)
65 100 65 80 30 50 30 50 20 25
1500 250
(160)
200
(130)
200c100 130 80 130 50 50 25 50
2000 200 200c250c130 200 100 160 40
2500 160 200 130 200 50
3000 200 200
TABLE 19 – RECOMMENDED TRANS-GUARD™ FX MOUNTED IN AIR AT 40°C AMBIENT TEMPERATURE
NOTES:
Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating.
Recommended fuses meet inrush criteria of 12 times transformer full load current for 0.1 second and 25 times transformer full load current for
0.01 second. Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load
current for 10 seconds.
Shaded areas indicate parallel fuse applications.
Ratings in parenthesis are 2.2” dia. fuses (model numbers HTFX230065 and HTFX230080).
a Fuse allows greater than 300% of transformer rating.
b Fuse allows greater than 200% of transformer rating.
c Recommendations limited to gndY-gndY transformers with no more than 50% delta connected secondary load. Phase-to-ground rated
fuses are frequently recommended for gndY-gndY three phase transformers.
FuseVoltage 8.3kV 15.5kV 23kV
FX Full-Range
CL Fuses
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PG-PC-H-0307
Trans-Guard™ FX Fuses
Current
Rating
(Amps)
Fuse Diameter
(in)
Catalog Number
5.5kV 8.3kV 15.5kV 23.0kV
3
2.2
– HTFX230003 HTFX240003 -
6 – HTFX230006 HTFX240006 HTFX250006
8 – HTFX230008 HTFX240008 HTFX250008
10 – HTFX230010 HTFX240010 HTFX250010
12 – HTFX230012 HTFX240012 HTFX250012
18 – HTFX230018 HTFX240018 HTFX250018
20 – HTFX230020 HTFX240020 HTFX250020
25 – HTFX230025 HTFX240025 HTFX250025
30 – HTFX230030 HTFX240030 HTFX250030
40 – HTFX230040 HTFX240040 HTFX250040
50 – HTFX230050 HTFX240050 HTFX250050
60 – HTFX230030 HTFX240030 –
65 – HTFX230065 – –
80 – HTFX230080 – –
80 – HTFX230040 HTFX240040 –
100 – HTFX230050 HTFX240050 –
130 – HTFX230065 – –
160 – HTFX230080 – –
65
3.3
– HTFX330065 HTFX340065 –
80 HTFX320080 HTFX330080 HTFX340080 –
100 HTFX320100 HTFX330100 HTFX340100 –
125 HTFX320125 HTFX330125 – –
130 – HTFX330065 HTFX340065 –
150 HTFX320150 – – –
160 – HTFX330080 HTFX340080 –
200 HTFX320200 – – –
200 – HTFX330100 HTFX340100 –
250 – HTFX330125 – –
FUSE ORDERING INFORMATION
TABLE 20 – FUSE CATALOG NUMBERS
To order the proper fuse for a particular application, first determine the correct fuse
voltage and current rating using either the appropriate application table (Tables 15-
19) or the published performance data (Tables 13-14, the applicable TCC’s and Peak
Let-through Characteristics). Then refer to Table 20 to determine the appropriate
catalog number.
NOTES:
1. To order a fuse having a blown fuse indicator, replace the 7th character (“0”) in the catalog number with a
“1” (EXAMPLE: HTFX241040). Please note that indicator fuses are not suitable for use in drywell canister
applications. Also, an indicator option is not available on 3A fuses.
2. Contact factory for ordering information concerning available outdoor and under-oil fuse versions.
3. Shaded current ratings shown are achieved by using a parallel combination of two fuses (order two fuses).
FX Full-Range
CL Fuses
21
PROTECTION AND CONTROL
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PG-PC-H-0307
Trans-Guard™ FX Fuses