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1 B C Table 1 DIMENSIONAL Information for Trans-Guard OS Fuses Fuse Voltage Rating (kv) 1/4-20 threaded hole 1/2 deep (both ends) Current Rating (Amps) Fuse Catalog Number 35 HTDS Overall Diameter (A) Overall Length (B) ( mm) Body Length (C) ( mm) A Fuse Weight 2.25lb. 1.02kg 40 HTDS HTDS HTDS ( mm) ( mm) 3.25lb. 1.47kg 80 HTDS HTDS HTDS ( mm) 150 HTDS HTDS ( mm) ( mm) 7.25lb. 3.29kg 200 HTDS HTDS HTDS ( mm) ( mm) 3.25lb. 1.47kg 40 HTDS HTDS HTDS ( mm) ( mm) 4.75lb kg 80 HTDS HTDS ( mm) 125 HTDS HTDS HTDS ( mm) ( mm) 10.75lb. 4.87kg 200 HTDS HTDS HTDS ( mm) ( mm) ( mm) 4.75lb kg 65 HTDS HTDS HTDS HTDS ( mm) ( mm) ( mm) 12.0lb. 5.44kg 175 HTDS NOTE: Other hardware is available, consult the factory.
2 TABLE 3 ELECTRICAL CHARACTERISTICS OF Trans-Guard OS FUSES (SINGLE FUSES) Rated Peak Arc Maximum Fuse Voltage Current Fuse Maximum Voltage Minimum Minimum Total l 2 t Rating Rating Catalog Voltage (kv) l/c Melt l 2 t (AMP 2 -SEC) (kv) (Amps) Number (kv) (3) (Amps) (AMP 2 -SEC) (2) HTDS ,140 10, HTDS ,200 10, HTDS ,000 16, HTDS ,000 34, HTDS ,000 45, HTDS , , HTDS ,000 90, HTDS , , HTDS ,250 67, , HTDS , , , HTDS ,140 10, HTDS ,200 9, HTDS ,340 14, HTDS ,000 16, HTDS ,000 34, HTDS ,000 45, HTDS ,000 39, , HTDS ,000 90, HTDS , , HTDS ,200 67, , HTDS , , , HTDS ,200 10, HTDS ,000 17, HTDS ,000 38, HTDS ,100 70, HTDS ,000 31, , HTDS ,300 66, , HTDS , , , All fuses have a rated maximum interrupting current of 50,000 A rms symmetrical. 2. Maximum total I 2 t values are reduced for currents below 50,000 A. For example, at 10,000 A, maximum total I 2 t values are approximately 15% less than the published values. 3. 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.
3 TABLE 5 ELECTRICAL CHARACTERISTICS OF Trans-Guard OS FUSES (Fuses tested for use in Parallel) Fuse Rated Peak Arc Maximum Fuse Voltage Current Catalog Number Maximum Voltage Minimum Minimum Total l 2 t Rating Rating (Order Two Voltage (kv) l/c Melt l 2 t (AMP 2 -SEC) (kv) (Amps) Fuses) (kv) (5) (Amps) (AMP 2 -SEC) (3) (4) 250 HTDS , , HTDS , , , HTDS , , HTDS , , ,000 TABLE 6 ELECTRICAL CHARACTERISTICS OF Trans-Guard OS SHORTY FUSES (Fuses tested for use in Parallel) Fuse Rated Peak Arc Maximum Fuse Voltage Current Catalog Number Maximum Voltage Minimum Minimum Total l 2 t Rating Rating (Order Two Voltage (kv) l/c Melt l 2 t (AMP 2 -SEC) (kv) (Amps) Fuses) (kv) (5) (Amps) (AMP 2 -SEC) (3) (4) Notes for tables 5 and 6: 130 HTSS ,800 65, HTSS , , HTSS , , HTSS ,900 92, , HTSS , , , HTSS , , , HTSS ,800 92, HTSS , , HTSS , , (1) HTSS ,130 59, , (1) HTSS , , , HTSS , , , HTSS ,800 68, HTSS , , HTSS , ,000 (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 above 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 I 2 t values are at the nominal voltage of the fuse. Values for 17.2kV fuses at kv are reduced by approximately 12%, while values for 23kV fuses at 25.5kV are increased by approximately 13%. (4) Maximum total I 2 t values are reduced for currents below 50,000 A. For example, at 10,000 A, maximum total I 2 t 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.
4 Fuse Selection For a detailed explanation on selecting the appropriate backup current limiting fuse for a given application, please refer to Hi-Tech Fuses 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 7, please refer to fuse coordination Tables These tables include columns that specify both OS and OS Shorty fuses for each application. More comprehensive tables listing fusing alternatives for transformers having any impedance can be found at TABLE 7 Assumed transformer impedances used for fuses coordination (Tables 8-11) Transformer Size () 1ɸ Impedances (%) 3ɸ Impedances (%) and up
5 TABLE 8 1 transformer coordination table for expulsion & Trans-Guard os/os shorty fuses FuseVoltage.3kV /17.2kV kv Transformer Voltage Rating (kv) Phase-to-Ground 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 ( ) a,c and OS/OS Shorty Fuse Coordinations 5 C C C C C C03 30 C C C C C C C03 30 C C C C C C C03 30 C C C C C C C03 30 C C C C C C C03 30 C C C C C C C05 30 C C C C C C C08 50 C C C C C C C08 65 C C C C C C C C C C C C C C C C C C C C C C C C Current Sensing Bay-O-Net ( ) a,b and OS/OS Shorty Fuse Coordinations 5 C C C C C C04 30 C C C C C C C04 30 C C C C C C C04 30 C C C C C C C04 30 C C C C C C C04 30 C C C C C C C06 30 C C C C C C C06 30 C C C C C C C08 40 C C C C C C C10 65 C C C C C C10 65 C C C C C C C C C C C C Dual Element Bay-O-Net ( ) a,c and OS/OS Shorty Fuse Coordinations 5 C C C C C C03 30 C C C C C C C03 30 C C C C C C C03 30 C C C C C C C03 30 C C C C C C C03 30 C C C C C C C04 30 C C C C C C06 40 C C C C C C07 50 C C C C C07 65 C C C C C C C Bay-O-Net fuse selection is based on Cooper Power Systems recommendations. 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 7. If the impedance is higher, a smaller fuse can often be used. Shaded areas indicate parallel fuse applications. a Or equivalent Bay-O-Net link. b 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 with the transformer initially carrying 75% of load at an ambient temperature of 35 C. 11
6 TABLE 9 3 transformer coordination table for expulsion & Trans-Guard os/os shorty fuses.3kv /17.2kV kv Transformer Voltage Rating (kv) Phase-to-Phase d 24.9 d d 34.5 d 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 ( ) a,c and OS / OS Shorty Fuse Coordinations 45 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 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 C12 e C C C C C C C C12 e C C C18 d 300 C18 d C C C14 e 200 C C C C C Current Sensing Bay-O-Net ( ) a,b and OS / OS Shorty Fuse Coordinations 45 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 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 e C C C17 e C C C16 e 200 C C C17 e C Dual Element Bay-O-Net ( ) a,c and OS / OS Shorty Fuse Coordinations 45 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 C C C C C C C C C C C C C C C Bay-O-Net fuse selection is based on Cooper Power Systems recommendations. 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 7. If the impedance is higher, a smaller fuse can often be used. Shaded areas indicate parallel fuse applications. a Or equivalent bayonet link. b 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 with 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-to-ground 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. 12
7 TABLE 10 1 transformer coordination table for Cooper high ampere overload BaY-o-net ( _CB) & Trans-Guard os/os shorty fuses FuseVoltage.3kV /17.2kV Transformer Voltage (kv) Phase-to-Ground Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty Link OS Shorty 75 C C C C C C C C C C C C C C C TABLE 11 3 transformer coordination table for Cooper high ampere overload BaY-o-net ( _CB) & Trans-Guard os/os shorty fuses FuseVoltage.3kV /17.2kV Transformer Voltage Rating (kv) Phase-to-Phase a 24.9 a LINk os shorty link os shorty LINk os shorty LINk os shorty LINk os shorty LINk os shorty LINk os shorty C C C C C C C C C C C C C C C C C C C C C C C C05 b C05 b C C Bay-O-Net fuse selection is based on Cooper Power Systems recommendations. Bay-O-Net fuses are selected to meet inrush criteria of 12 times transformer full load current for 0.1 second. 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 7. If the impedance is higher, a smaller fuse can often be used. Shaded areas indicate parallel fuse applications. 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. 13
OVERALL LENGTH (B) " ( mm) " ( mm) " ( mm) " ( mm)
1 4-20 threaded hole 1 2" deep (both ends) Dimensional Information NOMINAL CURRENT CAT. NO. 40 HTSS232040 50 HTSS232050 65 HTSS232065 80 HTSS232080 100 HTSS232100 125 HTSS232125 150 HTSS232150 165 HTSS232165
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