HTSX330100 - Thomas & Betts Corporation

PROTECTION AND CONTROL

Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility

SX Full-Range

CL Fuses

PG-PC-H-0307

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™ SX 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 wet-well fuse holders

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 (140°C and 71°C for 2.2 inch and 3.3 inch

diameter Trans-Guard™ SX designs, respectively)

The Trans-Guard™ SX 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 in elevated ambient

temperatures up to their rated maximum

Application:

Trans-Guard™ SX fuses are specifically

designed to be installed in “wet-well” fuse

holders for oil-filled padmounted switchgear

and transformer applications (only 2.2 inch

diameter designs are suitable for wet-well fuses

holders mounted directly in transformers).

application temperature, which is 140°C and

71°C for the 2.2 inch and 3.3 inch diameter

designs, respectively. The Trans-Guard™

SX 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.

CAUTION: Trans-Guard™ SX fuses

are NOT designed for any type of live

switching operation.

Trans-Guard™ SX Fuses

Wet Well

Holder (kV)

Nominal Fuse

Voltage Rating

(kV)

Current Rating

(Amps)

Dimensions inches (mm)

A B C

8.3

5.5 100-250 3.29”

(83.6mm)

19.06”

(484.1mm)

14.66”

(372.4mm)

8.3

5-75 2.22”

(56.3mm)

19.06”

(484.1mm)

7.93”

(201.4mm)

90-160 3.29”

(83.6mm)

19.06”

(484.1mm)

11.85”

(300.1mm)

15.51

5-75 2.22”

(56.3mm)

19.06”

(484.1mm)

12.24”

(310.9mm)

90-150 3.29”

(83.6mm)

19.06”

(484.1mm)

14.66”

(372.4mm)

15.5 15.5

5-75 2.22”

(56.3mm)

21.12”

(536.4mm)

12.24”

(310.9mm)

90-150 3.29”

(83.6mm)

21.12”

(536.4mm)

14.66”

(372.4mm)

23.0 23.0 10-65 2.22”

(56.3mm)

21.12”

(536.4mm)

15.05”

(382.3mm)

TABLE 21 – DIMENSIONAL INFORMATION FOR TRANS-GUARD™ SX FUSES

CONSTRUCTION

PROTECTION AND CONTROL

Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility

SX Full-Range

CL Fuses

PG-PC-H-0307

Trans-Guard™ SX Fuses

NOTES:

1. To order a 15.5kV fuse that will fit in an 8.3kV wet-well fuseholder, replace the 7th character (“0”)

in the catalog number (see Table 22) with a “2” (Example: HTSX242050).

Nominal

Fuse Voltage

Rating (kV)

Current

Rating

(Amps)

Fuse

Catalog

Number

Rated

Maximum

Voltage (kV)

Maximum Continuous

Current (in Oil @ 60°C)

(5)

Peak Arc

Voltage

(6) (kV)

Minimum

Melt I2t

(AMP2

-SEC)

Maximum

Melt I2t (3) (4)

(AMP2

-SEC)

5.5

100 HTSX320100

5.5

114.0

22,100 110,000

150 HTSX320150 147.0 56,700 280,000

175 HTSX320175 172.0 78,300 380,000

225 HTSX320225 230.0 176,000 860,000

250 HTSX320250 253.0 259,000 1,270,000

8.3

5 HTSX230005

10.0

5.0 30 100 350

10 HTSX230010 11.5 32 620 2,700

12 HTSX230012 14.0 28 800 4,000

15 HTSX230015 17.0 28 800 4,000

20 HTSX230020 22.5 26 920 8,000

25 HTSX230025 25.0 26 1,310 9,500

30 HTSX230030 30.0 26 1,620 11,000

40 HTSX230040 43.0 26 3,660 22,000

50 HTSX230050 53.0 26 5,250 30,000

65 HTSX230065 65.0 26 8,700 50,000

75 HTSX230075 75.0 26 12,800 70,000

90 HTSX330090

8.3

92.0

25,200 100,000

100 HTSX330100 105.0 47,500 185,000

150 HTSX330150 150.0 78,300 330,000

160 HTSX330160 163.0 115,150 480,000

15.5

5 HTSX240005

17.2

5.0 51 100 510

10 HTSX240010 11.5 54 620 2,600

12 HTSX240012 14.0 46 800 3,700

15 HTSX240015 17.0 46 800 3,700

20 HTSX240020 22.5 43 920 6,500

25 HTSX240025 25.0 45 1,310 8,000

30 HTSX240030 30.0 45 1,620 10,000

40 HTSX240040 43.0 45 3,660 22,000

50 HTSX240050 53.0 45 5,250 30,000

65 HTSX240065 65.0 45 8,700 50,000

75 HTSX240075 75.0 45 12,800 70,000

90 HTSX340090

15.5

98.0

25,200 110,000

100 HTSX340100 117.0 39,400 185,000

150 HTSX340150 150.0 80,000 380,000

23.0

10 HTSX250010

23.0

11.5 67 620 3,100

12 HTSX250012 14.0 61 800 4,800

15 HTSX250015 17.0 61 800 4,800

20 HTSX250020 22.5 60 920 8,300

25 HTSX250025 25.0 60 1,310 11,200

30 HTSX250030 30.0 60 1,620 13,000

40 HTSX250040 42.0 60 3,660 28,000

50 HTSX250050 51.0 60 5,250 38,000

65 HTSX250065 65.0 60 8,700 61,000

TABLE 22 – ELECTRICAL CHARACTERISTICS OF TRANS-GUARD™ SX FUSES

NOTES:

1. Designs have a 50,000 Amps rms. Symmetrical Rating (except 5A 17.2kV which was tested at 44kA maximum).

2. Fuses rated 75A and below are 2.25” in diameter. Higher ratings are 3.3” in diameter.

3. Tabulated Maximum Total I

t values are for currents of 50,000 amperes at the nominal voltage of the fuse. Fuses which have a Rated Maximum Voltage higher

than their Nominal Voltage Rating will have a higher I

t let-through when applied at voltages up to these higher values. For example, Maximum Total I

t values are

increased by approximately 30% when 8.3kV fuses are applied at 10 kV and approximately 25% when 15.5kV fuses are used at 17.2 kV.

4. Maximum total I

t values are reduced for currents below 50,000 A. For example, at 10,000 A, I

t values are approximately 15% less than the published values.

5. Maximum continuous currents at different ambient temperatures: These may be determined by derating the fuses by 0.2% per degree C over 60°C (for example at

80°C the derating would be 20 x .2 = 4%, making the maximum continuous current of a 20 A fuse 22.5 x .96 = 21.6A) or rerating the fuses by .2 % per degree C under

60°C (for example at 40°C the rerating would be 20 x .2 = 4 %, making the maximum continuous current of a 20 A fuse 22.5 / .96 = 23.4A). The long time melting

current of the fuses (approximately one hour and longer) due to different ambient temperatures is the same as described above for “maximum continuous currents”.

See time current characteristics for melting characteristics in this time region.

6. 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.

PROTECTION AND CONTROL

Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility

SX Full-Range

CL Fuses

PG-PC-H-0307

Trans-Guard™ SX 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 10 10a5 5a5a5a5a5a10a

15 12 10a10a5 5 5a5a5a10a

25 20b25 12 12 10a10a5 5a5a10a

37.5 30b40 20 20a12 12a10a10a10a10a

50 40b50 25b30 20b25 15 15 10 10a10a10a

75 50 65 30 40 30b40 20b25 20 15 12 12a10a

100 65 (100) 40 50 40b50 25 30 25 30 20 15 15 12

167 (150)b(175) 65 (100) 50 75 40 50 40b50 25 30 25b30 20b25 20

250 (150) (225) (100) (150) 75 (100) 50 75 50 65 40b50 30 40 30b40 25b30

333 (225) (150) (175) (150)b(175) 75 90 65 90 50 65 40 50 40b50 30 40

500 (250)c(175) (250) (150) (225) 100 150 100 150 65 90 50 75 50 65 40 50

833 (250)c(250) 160 160 100 150 90 100 75 65

1000 (250)c160c150 100 150

1500 150c150

FuseVoltage (5.5kV) 8.3kV 15.5kV 23kV

TABLE 23 – RECOMMENDED TRANS-GUARD™ SX FOR SWITCHGEAR (MOUNTED IN A WET WELL FUSEHOLDER WITH A MAX. OIL TEMP. OF 60°C)

NOTE: Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating. See additional notes on page 26.

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

A B A B A B A B A B A B A B A B

15 10a5 5 5a5a5a5a10a

22.5 12 10a10a5 5a5a5a10a

30 15 10 10a10a5 5a5a10a

45 20b25 15 12 10 10a5 5 10a

75 30 40 20b25 20 12 12 10a10a10a

100 40 50 25 30 25b30 20 15 12a10a10a

112.5 40 65 30b40 25 30 20 20a12 12a10a

150 65 75 40b50 30 40 25b30 20b25 15 15 10

200 75 (100) 50 65 40 50 30 40 25 30 20 20 12

225 75 (100) 50 75 40 65 30 40 30b40 20b25 20 15

300 (150)b(175) 65 (100) 65 75 40 50 40b50 25 30 25 30 20

500 (175) (250) (150)b(175) (100) (150) 65 90 50 75 40 50 40b50 25 30

750 (250) (150) (225) (150) (225) 90 150 75 100d50 75 50 65 40b50

1000 (225) (175) (250) 150 160 100d150d75 90 65 90 50 65

1500 (250)c(250) 160 150d100 150 100 150 65

2000 150 150

2500 150c150

3000 150c

FuseVoltage (5.5kV) 8.3kV 15.5kV 23kV

TABLE 24 – RECOMMENDED TRANS-GUARD™ SX FOR SWITCHGEAR: PROTECTING DELTA CONNECTED TRANSFORMERS (MOUNTED IN A WET WELL FUSEHOLDER WITH A MAX. OIL TEMP. OF 60°C)

NOTE: Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating. See additional notes on page 26.

PROTECTION AND CONTROL

Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility

SX Full-Range

CL Fuses

PG-PC-H-0307

Trans-Guard™ SX Fuses

PROTECTION AND CONTROL

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 22.9-24.9 34.5

A B A B A B A B A B A B A B A B A B A B

15 10a5 5 5a5a5a5a5a5a10a

22.5 12 10a10a5 5a5a5a5a5a10a

30 15 10 10a10a5 5a5a5a5a10a

45 20b25 15 12 10 10a5 5 5a5a10a

75 30 40 20

25 20 12 12 10a10a5 5 10a

100 40 50 25 30 25b30 20 15 12a10a10a10a10a

112.5 40 65 30

40 25 30 20 20a12 12a10a10a10a

150 65 75 40

50 30 40 25b30 20b25 15 15 10 10a10a

200 75

(100)

50 65 40 50 30 40 25 30 20 20 12 12 10a

225 75

(100)

50 75 40 65 30 40 30b40 20b25 20 15 12 10a

300

(150)b(175)

(100)

65 75 40 50 40b50 25 30 25 30 20 20a12

500

(175) (250) (150)b(175) (100) (150)

(100)

50 75 40 50 40b50 25 30 25b30 20

750

(250) (150) (225) (150) (225) (100) (150)

(100)

50 75 50 65 40b50 40b50 25b30

1000

(225) (175) (250) (150) (175) (150)b(175)

75 90 65 90d50 65 40 50 30 40

1500

(250)c(250) (175) (250) (150) (225)

100 150 100d150d65 90 65 75 40 50

2000

(225) (225)

150 150d75 100 75 90 50

2500

(250)c(250)

160 150d100 150 90 150 65

3000 160c150 100 150

TABLE 25 – RECOMMENDED TRANS-GUARD™ SX FOR SWITCHGEAR: PROTECTING GNDY-GNDY* CONNECTED TRANSFORMERS WITH

LESS THAN 50% DELTA CONNECTED SECONDARY LOAD (MOUNTED IN A WET WELL FUSEHOLDER WITH A MAX. OIL TEMP. OF 60°C)

NOTES FOR TABLES 23, 24 AND 25:

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 c

urrent for 10 seconds.

• Ratings in parentheses are 5.5 kV rated fuses.

a Fuse allows more than 300% of transformer rating.

b Fuse allows more than 200% of transformer rating.

c Fuse allows at least 125% of transformer rating.

d 15.5kV fuse must be used for voltages over 8.32 kV for delta configurations or 13.8kV GndY/8.32kV.

*Phase-to-Ground rated fuses are commonly used for GndY/GndY connected transformers having no more than 50% Delta connected

secondary load.

FuseVoltage

(5.5kV) 8.3kV 15.5kV 23kV

Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility

SX Full-Range

CL Fuses

PG-PC-H-0307

Trans-Guard™ SX Fuses

Continuous

Current Rating

(Amps)

Catalog Number

5.5kV 8.3kV 15.5kV 23.0kV

5 – HTSX230005 HTSX240005 –

10 – HTSX230010 HTSX240010 HTSX250010

12 – HTSX230012 HTSX240012 HTSX250012

15 – HTSX230015 HTSX240015 HTSX250015

20 – HTSX230020 HTSX240020 HTSX250020

25 – HTSX230025 HTSX240025 HTSX250025

30 – HTSX230030 HTSX240030 HTSX250030

40 – HTSX230040 HTSX240040 HTSX250040

50 – HTSX230050 HTSX240050 HTSX250050

65 – HTSX230065 HTSX240065 HTSX250065

75 – HTSX230075 HTSX240075 –

90 – HTSX330090 HTSX340090 –

100 HTSX320100 HTSX330100 HTSX340100 –

150 HTSX320150 HTSX330150 HTSX340150 –

160 – HTSX330160 – –

175 HTSX320175 – – –

225 HTSX320225 – – –

250 HTSX320250 – – –

TABLE 26 – ORDERING INFORMATION FOR TRANS-GUARD™ SX FUSES

NOTES:

To order a 15.5kV fuse that will fit in an 8.3kV Wet-well fuseholder, replace the 7th character (“0”) in the catalog number

with a “2” (EXAMPLE: HTSX242050).

Ordering Information:

To order the proper fuse for a particular application, first determine the correct fuse voltage

and current rating using the published performance data (Table 22 and the applicable TCC).

Then refer to Table 26 to determine the appropriate catalog number. Alternatively, fuse

selection can be determined using the accompanying application Tables 23-25.

PROTECTION AND CONTROL

When replacing the obsolete AB Chance SL fuse with a Hi-Tech Fuses Trans-

Guard™ SX fuse, it is important to recognize that the SX fuse designs should not

be used on distribution systems where the primary line-to-line voltage exceeds the

rated maximum voltage of the fuse as shown in the chart to the right:

This should be considered when choosing a proper replacement for the AB Chance

SL fuse as they were, in some cases, used on systems having line-to-line voltages

greater than that of the current-limiting fuse component of the assembly.

Again, when choosing the appropriate Hi-Tech SX fuse to replace the AB Chance

SL fuse, care must be taken to ensure that the rated maximum voltage of the SX

fuse exceeds the system line-to-line voltage. The only exception to this require-

ment is when all the transformers that are downstream from the switches where the

SX fuses are to be installed are GndY-GndY connected with less than 50% delta

connected secondary load. In that case, a fuse having a rated maximum voltage

exceeding the system line-to-neutral voltage may often be used.

TRANS-GUARD™ SX

Nominal

Fuse Voltage

Rating (kV)

Current

Rating

(Amps)

Rated

Maximum

Voltage (kV)

5.5 100-250 5.5kV

8.3 5-75 10.0kV

90-160 8.3kV

15.5 5-75 17.2kV

90-150 15.5kV

23.0 10-65 23.0kV

Important Notice When Using Trans-Guard™ SX Fuses

Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility

SX Full-Range

CL Fuses

PG-PC-H-0307

Trans-Guard™ SX Fuses