PROTECTION AND CONTROL Trans-GuardTM FX Fuses The Trans-GuardTM FX full-range currentlimiting fuse provides both overload and fault FX Full-Range CL Fuses 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 temperature (RMAT). The Trans-GuardTM 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. Figure 1 Figure 2 Applications: Trans-GuardTM FX fuses are available in a broad range of ratings. For ease of application, all designs are compatible with the industryrecognized standard mounting codes. Common applications include the Trans-GuardTM 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) * Installed in Elastimold MCAN rubber molded canister for dead-front/submersible applications (see page 47) * Installed directly in oil (contact factory for more information) Feature benefit/description Patented Damage Sensor Designed to significantly reduce the risk of fuse failure should the fuse be subjected to an element damaging current surge Hermetically sealed construction Ensures that no gasses escape from the fuse during current interruption. All Trans-GuardTM FX fuses are helium mass spectrometer leak tested to ensure sealing system integrity Rugged machined brass end caps Used for greater ferrule strength resulting in less distortion and more secure fuse attachment in dry-well canisters 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) 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 14 Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility PG-PC-H-0307 PROTECTION AND CONTROL Trans-GuardTM FX Fuses Construction FX Full-Range CL Fuses Table 12 - dimensional Information for Trans-GuardTM FX Fuses Nominal Fuse Voltage Rating (kV) Current Rating (Amps) 5.5 8.3 Standard Mounting Code A B C 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 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 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 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 15.5 23.0 Dimensions inches (mm) BLOWN FUSE INDICATOR Before Operation PG-PC-H-0307 Figure 3 After Operation Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility 15 PROTECTION AND CONTROL Trans-GuardTM FX Fuses Table 13 - Electrical characteristics of Trans-GuardTM fx fuses (single fuses) Nominal Fuse Voltage Rating (kV) FX Full-Range CL Fuses 5.5 Fuse Diameter (in) 3.3 2.2 8.3 3.3 2.2 15.5 3.3 23.0 16 2.2 Rated Maximum Voltage (kV) Maximum Continuous Current (In Air) (6) Current Rating (Amps) Fuse Catalog Number 80 HTFX320080 100 HTFX320100 125 HTFX320125 150 200 3 HTFX230003 5.0 6 HTFX230006 11.0 Peak Arc Minimum Maximum 2 2 Voltage Melt I t Melt I t (5) (3) (4) 2 2 (AMP-SEC) (AMP-SEC) (kV) 25C 40C 55C 99 96 94 15.0 22,100 110,000 126 122 118 15.0 56,700 280,000 142 138 134 15.0 78,300 380,000 HTFX320150 184 178 173 15.0 176,000 860,000 HTFX320200 208 202 196 15.0 259,000 1,270,000 4.9 4.7 30 100 350 10.5 10.0 32 620 2,700 5.5 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 80 HTFX230080 65 80 100 HTFX330100 125 3 6 8 10.0 87.0 84.0 81.5 23 34,000 200,000 100.0 98.0 95.0 22 51,200 280,000 HTFX330065 81.0 79.0 77.0 25 25,200 100,000 HTFX330080 95.0 92.0 89.0 25 47,200 185,000 120.0 117.0 113.0 25 78,300 330,000 HTFX330125 135.0 131.0 127.0 25 115,150 480,000 HTFX240003 5.0 4.9 4.7 51 100 510 HTFX240006 11.0 10.5 10.0 54 620 2,600 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 65 HTFX340065 78.0 75.0 73.0 40 25,200 110,000 80 HTFX340080 100 HTFX340100 6 8 8.8 8.3 17.2 15.5 88.0 85.0 82.0 40 39,400 185,000 114.0 110.0 107.0 40 80,000 380,000 HTFX250006 11.0 10.5 10.0 67 620 3,100 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 23.0 Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility RMAT (8) (C) 71 140 71 140 71 140 PG-PC-H-0307 PROTECTION AND CONTROL Trans-GuardTM FX Fuses Table 14 - Electrical characteristics of Trans-GuardTM fx fuses (Parallel fuses) Nominal Fuse Voltage Rating (kV) Fuse Diameter (in) 2.2 8.3 3.3 15.5 3.3 Fuse Catalog Number 60 HTFX230030 80 HTFX230040 100 HTFX230050 130 HTFX230065 160 HTFX230080 130 HTFX330065 160 HTFX330080 200 HTFX330100 250 HTFX330125 60 HTFX240030 80 HTFX240040 Rated Maximum Voltage (kV) 10.0 8.3 8.8 8.3 17.2 Maximum Continuous Current (In Air) (6) 25C 40C 55C Peak Arc Voltage (5) (kV) Minimum 2 Melt I t (AMP-SEC) Maximum 2 Melt I t (3) (4) 2 (AMP-SEC) 80.0 77.0 75.0 26 21,000 120,000 2 98.0 95.0 92.0 26 34,000 180,000 111.0 108.0 105.0 24 51,200 250,000 170.0 165.0 160.0 22 136,000 670,000 198.0 191.0 186.0 21 204,800 890,000 158.0 154.0 151.0 24 100,800 400,000 186.0 180.0 175.0 24 189,000 740,000 235.0 229.0 221.0 24 313,000 1,300,000 265.0 256.0 249.0 24 460,500 1,800,000 80.0 77.0 75.0 45 21,000 110,000 98.0 95.0 92.0 45 34,800 170,000 100 HTFX240050 104.0 101.0 98.0 45 51,200 310,000 130 HTFX340065 152.0 147.0 143.0 39 100,800 440,000 160 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 15.5 RMAT (8) (C) 140 40 71 FX Full-Range CL Fuses 2.2 Current Rating (Amps) 140 71 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 sharing 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, maximum 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 confining enclosures: * These may be determined by derating the fuses by 0.2% per degree C over 25C (for example at 85C 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 confining enclosure, such as a drywell canister, additional derating of a fuse's maximum continuous current is necessary. Specifically, 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 140C at a reduced rated maximum voltage of 5.5kV. PG-PC-H-0307 Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility 17 PROTECTION AND CONTROL Trans-GuardTM FX Fuses TABLE 15 - Recommended Trans-GuardTM FX mounted in a standard drywell canister in oil (at a Max. oil temp. of 100C) Recommended Fuse Current Ratings (Amperes) FuseVoltage8.3kV FX Full-Range CL Fuses 1-Phase Transformer kVA 15.5kV23kV Transformer 1-Phase Voltage Rating (kV) Phase-to-Ground 2.4 4.16 A 4.8 B A 7.2 B 7.62 A B A 12 B A 14.4 B A 16 B A 19.9 A B 10 6b 8 6a 3 3a 3a 3a 3a 3a B A 6a B 15 8 12 6 6 3 3 3a 3a 3a 6a 25 18 20 8 12 8b 10 6 6 3 3 3 6a 37.5 20 30 12 18 b 12 18 8 10 8 6 a 6 a 6 6a 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 12b 18 10 12 10b 12 8 167 100 60 80 50 80 250 30 50 30 50 20 25 18 25 18 20 12 18 80 50 60 50 60 25 40 20 40 20 30 18 25 100 60 100 60 100 80 333 40 60 30 50 25 40 20 30 500 60 80 50 80 40 60 40 50 750 80 60 100 80 1000 100 TABLE 16 - Recommended 8.3kV Trans-GuardTM FX mounted in 15.5kV drywell canister in oil (at a Max. oil temp. of 100C) Recommended Fuse Current Ratings (Amperes) FuseVoltage8.3kV Transformer 1-Phase Voltage Rating (kV) Phase-to-Ground 1-Phase Transformer kVA 2.4 A 75 4.16 B 4.8 A B 65 80 A 7.2 B A 7.62 B A B 80 100 65 80 167 X* 160 250 160 80 80 130 80 130 333 130 160 X* 160 500 160 65 65 160 X* 130 65 65 X* 130 *X=Use an 8.3kV Drywell Canister. See Table 15 for fuse recommendations. 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. 18 Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility PG-PC-H-0307 PROTECTION AND CONTROL Trans-GuardTM FX Fuses TABLE 17 - Recommended Trans-GuardTM FX mounted in a standard drywell canister in oil (at a Max. oil temp. of 100C) Recommended Fuse Current Ratings (Amperes) FuseVoltage8.3kV 3-Phase Transformer kVA 15.5kV23kV Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase 2.4 A 15 4.16 B A 4.8 B 7.2-7.96 A B A 8.32 B A 12.47 B A 13.2-14.4 B A 20.8 B A 22.9-24.9c B A B 34.5c A B 6 3 3 3 3 3 3 6 6 6a a 6 3 3 3 3 6 a 6 6a 8 10 6 30 10 18 6 45 18 20 8 75 25 40 100 40 112.5 a a a a a a a a 6 6a 3 3a 3a 6a 6a 6a 12 b 8 10 6 6 3 3 6 a 6 6a 18 20 12 18 8 6 6a 6a 6a 50 20 25 18 8 6 a 6 6a 40 60 20 30 150 50 80 25 200 80 100 225 80 12 8b 10 6 20 b 12 18 10 12 8 20 25 12 18 12b 18 8b 10 40 25 40 18 20 18 20 10 40 60 30 50 20 30 20 25 6 a a 8 6 6a 6a 18 b 10 12 6 6 6a 12 20 12b 18 8 10 8 6 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 12b 18 8 500 100 60 80 50 80 30 50 30 40 20 25 18 25 12 18 50 80 50 60 25 40 25 40 18 25 60 100 60 80 40 40 20 30 50 40 80 750 80 80 1000 1500 100 2000 50 TABLE 18 - Recommended 8.3kV Trans-GuardTM FX mounted in 15.5kV drywell canister in oil (at a Max. oil temp. of 100C) Recommended Fuse Current Ratings (Amperes) FuseVoltage8.3kV Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase 3-Phase Transformer kVA 2.4 A 4.16 B 112.5 65 150 80 A 4.8 B 200 80 X* 65 225 80 130 65 300 130 500 160 b 750 1000 160 65 80 X* 160 160 A 7.2-7.96 B 8.32 A B A B 65 80c 130 80c 130 80c 130 160 130 160 130 160c 65 80 80 130 1500 160c c 80c b 130 *X=Use an 8.3kV Drywell Canister. See Table 17 for fuse recommendations. 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). PG-PC-H-0307 Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility 19 FX Full-Range CL Fuses 22.5 a PROTECTION AND CONTROL Trans-GuardTM FX Fuses TABLE 19 - Recommended Trans-GuardTM FX mounted in air at 40C Ambient temperature Recommended Fuse Current Ratings (Amperes) FuseVoltage8.3kV FX Full-Range CL Fuses 3-Phase Transformer kVA 15.5kV23kV Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase 2.4 A 4.16 B A 4.8 B A 7.2-7.96 B A B 8.32 A 12.47 B A 13.2-14.4 B A B 20.8 A 22.9-24.9c B A B 34.5c A B 15 6 3 3 3 3 3 3 6 6 6a 22.5 8 a 6 6 a 3 3 3 3 6 a 6 6a a a a a a a a a a a a 30 10b 12 6 6 6a 3 3a 3a 6a 6a 6a 45 12 18 8 8 6 a 6 3 3 6 a 6 6a 75 20 40 12 18 12b 18 8 8 6 6a 6a 6a 6a 100 25 40 18 20 18 20 12 12 8 6 6 a 6 6a 112.5 30 50 20 25 18 20 12b 18 8 6a 6a 6a 150 40 (65) 25 30 20 25 18 20 12 10 6 6 6a 200 (65) (80) 30 50 25 40 20 25 8 8 6a 225 (65) 100 40 (65) 40 50 25 8 6 300 (80) (130) 50 (80) 40 (65) 25 500 (160) 250 750 250 a 10 b 12 8 18 b 10 12 8 18 20 12b 18 12b 18 30 20 30 12 18 b 12 18 40 25 30 18 20 18 20 b a a 8 10 12 10 12 8 (80) (130) (80) 125 50 (65) 40 (65) 25 40 25 40 18 25 18 25 12 18 (130) 200 125 (160) (65) 100 (65) (80) 40 65 40 65 25 40 20 40 18 25 200 250 (160) 250 100 (130) (80) (130) 65 100 65 80 30 50 30 50 20 25 (160) 200 (130) c 200 100 130 80 130 50 25 50 200c 250c 130 200 100 160 40 2500 160 200 130 200 50 3000 200 1000 1500 250 2000 200 50 b 200 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. 20 Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility PG-PC-H-0307 PROTECTION AND CONTROL Trans-GuardTM FX Fuses FUSE ORDERING INFORMATION 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 1519) 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. table 20 - FUSE Catalog Numbers Fuse Diameter (in) Catalog Number 5.5kV 8.3kV 15.5kV 23.0kV 3 - 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 2.2 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 - HTFX330065 HTFX340065 - 80 HTFX320080 HTFX330080 HTFX340080 - 100 HTFX320100 HTFX330100 HTFX340100 - 125 HTFX320125 HTFX330125 - - 130 - HTFX330065 HTFX340065 - 150 3.3 HTFX320150 - - - 160 - HTFX330080 HTFX340080 - 200 HTFX320200 - - - 200 - HTFX330100 HTFX340100 - 250 - HTFX330125 - - FX Full-Range CL Fuses Current Rating (Amps) 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. PG-PC-H-0307 Shaded current ratings shown are achieved by using a parallel combination of two fuses (order two fuses). Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com/utility 21