Figure 1. ELSP Current-Limiting Backup Fuse.

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1 Fusing Equipment Current-Limiting Backup Fuse Electrical Apparatus GENERAL The Cooper Power Systems Current-limiting Backup Fuse is used in series with low current primary protection devices such as a Bay-O-Net Fuse or MagneX Interrupter. The fuse is designed for use in transformer oil, Envirotemp FR3 fluid, or an approved equivalent. The fuse s highly efficient currentlimiting section minimizes the effects of high fault current stresses on equipment and the distribution system. Its minimum interrupting rating is coordinated with that of a low current interrupter to avoid undesirable low current operation; yet its maximum interrupting rating will clear the highest fault currents likely to occur. Higher continuous current ratings can be achieved by connecting two fuses in parallel. application The fuse is used in transformers to protect and isolate faulted equipment. When connected in series with a low current primary protection device, the fuse becomes an element of a twopart protection system that gives a full range of fault protection. This two-part system provides low current protection with the replaceable expulsion fuse or resettable MagneX Interrupter, and it adds the energylimiting protection of a current-limiting fuse. Together, they coordinate easily with upstream and downstream devices. Figure 1. Current-Limiting Backup Fuse. installation No special tools are required. The fuse is liquid immersed, mounted as near as possible to the incoming primary bushing to which it is connected. Normal liquid dielectric clearances should be used. Refer to Installation Instructions Sheet S for details. PRODUCTION TESTS Tests are conducted on 100 percent of production in accordance with Cooper Power Systems requirements. Physical Inspection I 2 t Testing Resistance Testing Helium Mass Spectrometer Leak Testing TABLE 1 Electrical s and Characteristics Fuse Type 8.3 kv kv Backup C Rated 17.2 kv Backup C Rated 23 kv Backup C Rated Maximum Interrupting Current,000 A rms symmetrical 43,000 A rms symmetrical 31,000 A rms symmetrical* * 23 kv, 1 A fuse is rated to,000 A rms symmetrical Supersedes

2 Current-Limiting Backup Fuse HIGH PURITY SILICA SAND FILLER Specific particle size, purity, and compaction gives the heat-absorbing and arc-quenching properties necessary for consistent clearing and low energy let-thru levels. MICA SPIDER Provides stable winding support without generating gas and pressure buildup during fuse operation. A B C SOLID COPPER END CAPS Brass inserts are tapped for attachment of a 1 /4 inch - 20 x 1 /2 inch lead hardware. DOUBLE SEALING SYSTEM Buna-N rubber gasket and epoxy sealant ensures seal performance and integrity. FIBERGLASS HOUSING Provides strength and maintains integrity of fuse during any interruption, from minimum melt current to maximum rated current of ka. INDELIBLE IDENTIFICATION LABEL Easy-to-read voltage and current ratings and catalog numbers. FUSE ELEMENT Stable under current cycling and thermal stress, providing consistent melt characteristics. The ribbons effectively control and minimize peak arc voltage levels resulting from high current interrup tions. During inter rup tion, the element effectively controls and limits both current and energy (l 2 t) let-thru levels. Figure 2. 2 diameter Current-Limiting Back-up Fuse cutaway shows design characteristics. Note: Dimensions given are for reference only. B C Figure 3. 3 diameter Current-Limiting Backup Fuse cutaway shows design characteristics. Note: Dimensions given are for reference only. 2

3 TABLE 2 Interrupting s Continuous Current Interrupting Capacity 8.3 kv 9.9 kv 15.5 kv Melt I 2 t Maximum Clear I 2 t Interrupting Capacity Melt I 2 t Maximum Clear I 2 t Interrupting Capacity Melt I 2 t Notes: 1. The 8.3 kv, A and 100 A ratings have been tested and approved for application at 9.9 kv. 2. The 15.5 kv, A through 125 A ratings have been tested and approved for application at 17.2 kv. The maximum interrupting rating for the 15.5 kv fuse, A through 125 A at 17.2 kv is 43 ka. For the 23 kv, 2 A fuse (parallel 125 A) the maximum interrupting rating is 12 ka. ** Parallel Fuses Maximum Clear I 2 t 200 1,0 9, ,0 9, ,0 10, ,900 14, ,900 14, ,900 19, ,0, ,0, ,0 33, ,0 33, ,0 34, ,0 40, ,600 56, ,600 56, ,600 62, ,600 76, ,600 76, , , , , ,100 1, ,0 290, ,0 260, , , , , , , , , , ,0 690, ** ,0 0,000 0 ** 1,0 234,200 1,2, ,200 1,0,000 3 ** 1,0 328,900 1,700, ** 1,0 412,0 2,100, ** 2, ,000 2,0, Continuous Current Interrupting Capacity 17.2 kv 23 kv Melt I 2 t Maximum Clear I 2 t Interrupting Capacity Melt I 2 t Maximum Clear I 2 t 200 1,0 10, ,0 12, ,900 19,0 2 2,900 20, ,0 34, ,0 39, ,0 42, ,0 44, ,600 62, ,600 70, , , , , ,100 1, ,100 1, ,0 320, ,200 4,000 2 ** ,0 6,000 0 ** ,200 1,0,000 3 ** ,900 1,700,000 3

4 Current-Limiting Backup Fuse ORDERING INFORMATION To order an current-limiting fuse, de ter mine the am per age and voltage ratings of the ap pli ca tion and specify the fuse required from Table 3. For parallel fusing, order two fuses. New Part Numbering Guide: C B U C xx xxx C D Cooper Backup Under-oil Clamp-Mounted Voltage Current 2 inch 3 inch 1 Single Barrel Design 00 Revision Code M Metric End Connection TABLE 3 Dimensional Information Current Dimension A Dimension B Dimension C Voltage (kv) Part Numbers Inches (mm) Inches (mm) Inches (mm) Description CBUC0C (183) 6.0 (152) 2.1 (53) 8.3 kv A 40 CBUC040C (183) 6.0 (152) 2.1 (53) 8.3 kv 40 A CBUC0C (183) 6.0 (152) 2.1 (53) 8.3 kv A 65 CBUC065C (183) 6.0 (152) 2.1 (53) 8.3 kv 65 A CBUC0C (244) 8.4 (214) 2.1 (53) 8.3/9.9 kv A CBUC08100C (244) 8.4 (214) 2.1 (53) 8.3/9.9 kv 100 A 125 CBUC08125C (244) 8.4 (214) 2.1 (53) 8.3 kv 125 A 1 CBUC081D (289) 3.0 (76) 8.3 kv 1 A 165 CBUC08165D (289) 3.0 (76) 8.3 kv 165 A 1 CBUC081D (289) 3.0 (76) 8.3 kv 1 A 2 CBUC082D (289) 3.0 (76) 8.3 kv 2 A CBUC090C (244) 8.4 (214) 2.1 (53) 9.9 kv A CBUC09040C (244) 8.4 (214) 2.1 (53) 9.9 kv 40 A CBUC090C (244) 8.4 (214) 2.1 (53) 9.9 kv A 65 CBUC09065C (244) 8.4 (214) 2.1 (53) 9.9 kv 65 A CBUC1C (247) 8.5 (216) 2.1 (53) 15.5 kv A 40 CBUC140C (247) 8.5 (216) 2.1 (53) 15.5 kv 40 A CBUC1C (247) 8.5 (216) 2.1 (53) 15.5 kv A 65 CBUC165C (247) 8.5 (216) 2.1 (53) 15.5 kv 65 A 15.5 CBUC1C (356) 12.8 (325) 2.1 (53) 15.5/17.2 kv A 100 CBUC15100C (356) 12.8 (325) 2.1 (53) 15.5/17.2 kv 100 A 125 CBUC15125C (429) 15.6 (396) 2.1 (53) 15.5/17.2 kv 125 A 1 CBUC151D (405) 3.0 (76) 15.5 kv 1 A 165 CBUC15165D (405) 3.0 (76) 15.5 kv 165 A 1 CBUC151D (405) 3.0 (76) 15.5 kv 1 A CBUC170C (356) 12.8 (325) 2.1 (53) 17.2 kv A CBUC17040C (356) 12.8 (325) 2.1 (53) 17.2 kv 40 A CBUC170C (356) 12.8 (325) 2.1 (53) 17.2 kv A 65 CBUC17065C (356) 12.8 (325) 2.1 (53) 17.2 kv 65 A CBUC2C (323) 11.5 (292) 2.1 (53) 23 kv A 40 CBUC240C (323) 11.5 (292) 2.1 (53) 23 kv 40 A CBUC2C (323) 11.5 (292) 2.1 (53) 23 kv A 65 CBUC265C (323) 11.5 (292) 2.1 (53) 23 kv 65 A 23 CBUC2C (429) 15.6 (396) 2.1 (53) 23 kv A 100 CBUC23100C (429) 15.6 (396) 2.1 (53) 23 kv 100 A 125 CBUC23125D (4) 3.0 (76) 23 kv 125 A 1 CBUC231D (4) 3.0 (76) 23 kv 1 A 165 CBUC23165D (4) 3.0 (76) 23 kv 165 A 23 kv fuse for use on 35 kv systems 1 CBUC351D (4) 3.0 (76) 23 kv 1 A fuse for use on a 35 kv System 4

5 Method A Correlation Information Use the correlation information in Tables 4, 5 and 6 to determine the amperage and voltage ratings of the fuse combination required for the application. Then use Table 3 to determine the appropriate fuse catalog number. Correlation is based on IEEE Std C57.92 standard Loading Guide and IEEE Std C standard Through- Fault Guide, and the Pad-mounted Fusing Philosophy Reference Document, R Tables 4, 5 and 6 indicate the rec om mend ed Bay-O-Net fuse link or MagneX Interrupter and combination for each application. To order a current sensing Bay-O- Net Fuse, complete catalog number To order a dual sensing Bay-O-Net Fuse, complete catalog number To order a dual element Bay-O-Net Fuse, complete catalog number To order a High Ampere Overload Bay- O-Net Fuse, complete catalog number Examples: To order an and dual element Bay-O-Net fuse combination for a single-phase, 7.2 kv phase-to-ground, kva transformer, specify: 1 A Fuse CBUC0C100 1 Bay-O-Net Fuse C07 Method B Time Current Curves To determine or confirm the fuse that will coordinate with up stream and downstream system requirements, use the time-current characteristic curves and specify the fuse in di cated from Table 3. For full size TCC curves R (8.3/9.9 kv), R (15.5/17.2 kv), and R (23.0 kv), contact your Cooper Power Systems rep re sen ta tive. 5

6 Current-Limiting Backup Fuse TABLE 4 Recommended Single-Phase Bay-O-Net and Combinations 8.3 kv Nominal Single -Phase Voltage (kv) Phase-to-Ground Single- Phase (kva) Indicates parallel fuse application Notes: The following tables show minimum recommended fuse ratings. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Rec om mended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. If a different transformer impedance is used, a different Fuse rating may be required. If a larger % is used, a smaller may coordinate. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C17 and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C C C C C C C C C C C C18 and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C C C C C C C C High Amp Overload Bay-O-Net/ Combinations c C03CB C04CB C03CB C05CB C04CB C05CB C03CB C04CB 6

7 TABLE 4 (Continued) Recommended Single-Phase Bay-O-Net and Combinations Single-Phase (kva) 15.5 kv 23 kv Nominal Single -Phase Voltage (kv) Phase-to-Ground Indicates parallel fuse application Notes: The following tables show minimum recommended fuse ratings. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Rec om mended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. If a different transformer impedance is used, a different Fuse rating may be required. If a larger % is used, a smaller may coordinate. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. d. Use 23.0 kv Rated fuse for this application range. (See Table 2, Note 2, Page 3 of this catalog section.) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C14 and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C d C C10 and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C High Amp Overload Bay-O-Net/ Combinations c C03CB C03CB

8 Current-Limiting Backup Fuse TABLE 5 Recommended Three-Phase Bay-O-Net and Combinations with Grounded Wye-Grounded Wye Connected Primary Windings Three- Phase (kva) Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. d. The use of these fuses will provide slightly less than 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems Representative for specific overload capability kv Fuse (Phase-to-Ground) Nominal Three -Phase Voltage (kv) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C C10 1. C C06 1. C06 1. C C C C C C C C C C C C C C10 3. C10 3. C C C C C C C C C C C C C C C C C C C C and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C C12 1. C08 1. C08 1. C08 1. C C C C C C C C C C C C C C C10 3. C C C C C C C C C C C C C C C and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C06 1. C06 1. C C C C C C C C C C C C12 3. C09 3. C09 3. C C C C C C C High Amp Overload Bay-O-Net/ Combinations c C03CB C03CB C04CB C03CB C05CB C04CB C03CB C05CB C03CB C03CB C03CB C04CB C04CB C04CB C05CB C05CB C05CB d C05CB d C05CB C05CB

9 TABLE 5 (Continued) Recommended Three-Phase Bay-O-Net and Combinations with Grounded Wye-Grounded Wye Connected Primary Windings Three-Phase (kva) 15.5 kv Fuse (Phase-to-Ground) Nominal Three -Phase Voltage (kv) Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C06 1. C04 1. C C C C C C C C08 3. C08 3. C C C C C C C C C C C C C C C C and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C05 1. C05 1. C C C C C C C C08 3. C08 3. C C C C C C C C C C C C C C and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C05 1. C04 1. C C C C C C C C C C C C C High Amp Overload Bay-O-Net/ Combinations c C03CB CO3CB C03CB C03CB C04CB C03CB C04CB C04CB C04CB C04CB 9

10 Current-Limiting Backup Fuse TABLE 5 (Continued) Recommended Three-Phase Bay-O-Net and Combinations with Grounded Wye-Grounded Wye Connected Primary Windings Three-Phase (kva) 23 kv Fuse (Phase-to-Ground) Nominal Three -Phase Voltage (kv) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C04 1. C C C C C C08 3. C C C C C C C C C C C14 and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C05 1. C C C C C C08 3. C C C C C C C C C C14 and Dual Element Bay-O-Net Fuse Combinations b C C C C C03 1. C C C C C C07 3. C C High Amp Overload Bay-O-Net/ Combinations c Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. 10

11 TABLE 6 Recommended Three-Phase Bay-O-Net and Combinations with Delta Connected Primary Windings Three-Phase (kva) 8.3 kv Fuse (Phase-to-Phase) Nominal Three -Phase Voltage (kv) Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C C C C C C C C and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C12 1. C C C C C C C C C C C C and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C High Amp Overload Bay-O-Net/ Combinations c C03CB C03CB C04CB C03CB C05CB C04CB C05CB

12 Current-Limiting Backup Fuse TABLE 6 (Continued) Recommended Three-Phase Bay-O-Net and Combinations with Delta Connected Primary Windings Three- Phase (kva) 15.5 kv Fuse (Phase-to-Phase) Nominal Three -Phase Voltage (kv) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C06 1. C06 1. C C C C C C C C10 3. C10 3. C C C C C C C C C C C C C C C and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C08 1. C08 1. C C C C C C C C C10 3. C C C C C C C C C C and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C06 1. C06 1. C C C C C C C C09 3. C09 3. C C C C C C C High Amp Overload Bay-O-Net/ Combinations c C03CB C03CB C03CB C03CB C04CB C04CB C04CB C05CB C05CB C05CB d C05CB d C05CB C05CB Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. d. The use of these fuses will provide slightly less than 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems Representative for specific overload capability. 12 Indicates parallel fuse application

13 TABLE 6 (Continued) Recommended Three-Phase Bay-O-Net and Combinations with Delta Connected Primary Windings Three-Phase (kva) 23 kv Fuse (Phase-to-Phase) Nominal Three -Phase Voltage (kv) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C06 1. C C C C C C08 3. C C C C C C C C C C C and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C05 1. C C C C C C08 3. C C C C C C C C C and Dual Element Bay-O-Net Fuse Combinations b C C C C C05 1. C C C C C C High Amp Overload Bay-O-Net/ Combinations c C03CB C03CB C03CB C04CB C03CB C04CB C04CB Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 12 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. 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 trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. The use of these fuses will provide 175% of rated load for 2 hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. 13

14 Current-Limiting Backup Fuse Application peak let-through current Maximum peak let-thru curves provide the opportunity of comparing an unprotected system of one protected with an expulsion fuse, boric acid fuse or recloser to a system protected with current-limiting backup fuse. For example, as shown in Figure 4, an unprotected circuit with a 10,000 A available fault current can deliver a maximum peak current to a fault of about 28,000 A (find the intersection of the 10,000 A available current line with the peak current line, and read the result on the left maximum letthru axis). This would be the current delivered, regardless of the size of any expulsion fuse that could be applied. Protecting this apparatus with a 15.5 kv, A, fuse however, would limit the peak let-thru current to the apparatus to about 8,000 A. This is the same peak let-thru delivered to a fault by a system having only 40 A available current. Figure 4. Peak Let-through Curves for 8.3 kv, 9.9 kv, 15.5 kv, 17.2 kv and 23 kv Backup Current-Limiting Fuse. 14

15 TABLE 7 Recommended MagneX Interrupter and Current-Limiting Fuse Combinations Nominal Single Phase (kv Phase to ground) 10 kva without Emergency Overload with Emergency Overload MagneX Element 15 kva. without Emergency Overload with Emergency Overload MagneX Element 25 kva without Emergency Overload with Emergency Overload MagneX Element 37.5 kva without Emergency Overload with Emergency Overload MagneX Element kva without Emergency Overload with Emergency Overload MagneX Element 75 kva without Emergency Overload with Emergency Overload MagneX Element 100 kva without Emergency Overload with Emergency Overload MagneX Element 167 kva without Emergency Overload with Emergency Overload MagneX Element 8.3 kv 15.5 kv 23 kv E10 E E E 1 1 E E E10 65 E E E E E Notes: The MagneX Interrupter recommendations are based on: Deration factor of 0.5% per C above 25 C. Allowable loading greater than 140% for four hours in accordance with IEEE Std C standard guide for Loading Distribution s, Table 6. If using a MagneX Interrupter equipped without emergency overload, a smaller rating may be used. 40 E10 E E E E40 E E10 E12 E18 E01 E E10 E18 E01 E01 E12 15

16 Current-Limiting Backup Fuse Additional Information Refer to the following reference literature for additional information: Fuse Holder Bay-O-Net Fuse Holder Assembly Current Sensing Bay-O-Net Fuse Dual Sensing Bay-O-Net Fuse Dual Element Bay-O-Net Fuse High Ampere Overload Bay-O-Net Fuse MagneX Interrupter R Pad-mounted Fusing Philosophy R Bay-O-Net Fuse 353C Fuse Time Current Characteristic Curves R Bay-O-Net Fuse 358C Fuse Time Current Characteristic Curves R Bay-O-Net Fuse 361C Fuse Time Current Characteristic Curves R Bay-O-Net Fuse 108C Fuse Time Current Characteristic Curves R MagneX Interrupter Time Current Characteristic Curves R kv Delta Rated 23.0 kv 1 A Time Current Characteristic Curves R /9.9 kv Time Current Characteristic Curves R /17.2 kv Time Current Characteristic Curves R kv Time Current Characteristic Curves S Current-Limiting Backup Fuse Installation Instructions CP kv-23 kv Certified Test Report CP kv Delta Rated 23.0 kv 1 A Certified Test Report W Fuse Coordination and Protection for 35 kv Delta Systems W Optimized Overcurrent Protection for Pad-mounted Under-oil s B Optimal Overcurrent Protection Contact your Cooper Power Systems representative for further in for ma tion or other applications Cooper Industries. All Rights Reserved. Cooper Power Systems, Magnex, Envirotemp, and FR3 are valuable trademarks of Cooper Industries in the US and other countries. You are not permitted to use the Cooper Trademarks without the prior written consent of Cooper Industries. IEEE Std C57.92, IEEE Std C57.91 and IEEE Std C standards are trademarks of the Institute of Electrical and Electronics Engineer, Inc., (IEEE). This publication/product is not endorsed or approved by the IEEE. One Cooper Online 20 Badger Drive Waukesha, WI USA 16

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