Time-Current Characteristic (TCC) Curves

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S&C’s Time-Current Characteristic (TCC) Curves are available in Adobe® Acrobat® format as well as in Microsoft® Excel format for your use in other applications. Click the +/- accordions below to see the TCC Curves.

S&C also offers Coordinaide™ — The S&C Protection and Coordination Assistant. Coordinaide lets you quickly and easily select the optimal protective device (e.g., power fuses, TripSaver® Dropout Reclosers, Vista® Underground Distribution Switchgear, or IntelliRupter® PulseCloser® Fault Interrupters).

S&C Standard Speed
Curve TypekV Nom. RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting All SMU-20 and SMU-40 TCC Number 153-2 PDF EXCEL
Total Clearing 4.8 SMU-40 TCC Number 153-2-1-4 PDF EXCEL
Total Clearing 14.4 SMU-20 TCC Number 153-2-2 PDF EXCEL
Total Clearing 14.4 and 25 SMU-40 TCC Number 153-2-3-4 PDF EXCEL
Total Clearing 25 and 34.5 SMU-20 TCC Number 153-2-4 PDF EXCEL
S&C Standard Speed for VTs
Curve TypekV Nom. RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting All SMU-20 and SMU-40 TCC Number 115-2 PDF EXCEL
Total Clearing 4.8 through 25 SMU-40 TCC Number 115-2-3-4 PDF EXCEL
Total Clearing 14.4 through 34.5 SMU-20 TCC Number 115-2-4 PDF EXCEL
S&C Slow Speed
Curve TypekV Nom. RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting All SMU-20 and SMU-40 TCC Number 119-2 PDF EXCEL
Total Clearing 4.8 SMU-40 TCC Number 119-2-1-4 PDF EXCEL
Total Clearing 14.4 SMU-20 TCC Number 119-2-2 PDF EXCEL
Total Clearing 14.4 and 25 SMU-40 TCC Number 119-2-3-4 PDF EXCEL
Total Clearing 25 and 34.5 SMU-20 TCC Number 119-2-4 PDF EXCEL
S&C Very Slow Speed
Curve TypekV Nom. RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting All SMU-20 TCC Number 176-2 PDF EXCEL
Total Clearing 14.4 SMU-20 TCC Number 176-2-2 PDF EXCEL
Total Clearing 25 and 34.5 SMU-20 TCC Number 176-2-4 PDF EXCEL
S&C “K” Speed
Curve TypekV Nom. RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting All SMU-20 TCC Number 165-2 PDF EXCEL
Total Clearing 14.4 SMU-20 TCC Number 165-2-2 PDF EXCEL
Total Clearing 25 and 34.5 SMU-20 TCC Number 165-2-4 PDF EXCEL
S&C “DR” Speed
Curve TypekV Nom. RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting All SMU-20 TCC Number 175-2 PDF EXCEL
Total Clearing 14.4 SMU-20 TCC Number 175-2-2 PDF EXCEL
Total Clearing 25 and 34.5 SMU-20 TCC Number 175-2-4 PDF EXCEL

S&C Standard Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SMD TCC Number 153-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-1A TCC Number 153-1-5-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-2C TCC Number 153-1-5-2 PDF EXCEL
Total Clearing 34.5 and 46 SMD-50 TCC Number 153-1-5-5 PDF EXCEL
Total Clearing 69 SMD-2B and SMD-3 TCC Number 153-1-6 PDF EXCEL
Total Clearing 69 SMD-1A TCC Number 153-1-6-1 PDF EXCEL
Total Clearing 69 SMD-50 TCC Number 153-1-6-5 PDF EXCEL
Total Clearing 115 and 138 SMD-1A and SMD-2B TCC Number 153-1-9 PDF EXCEL
S&C Standard Speed for VTs
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SMD TCC Number 115-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-1A TCC Number 115-1-5-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-2C TCC Number 115-1-5-2 PDF EXCEL
Total Clearing 69 SMD-2B and SMD-3 TCC Number 115-1-6 PDF EXCEL
Total Clearing 69 SMD-1A TCC Number 115-1-6-1 PDF EXCEL
Total Clearing 115 and 138 SMD-2B TCC Number 115-1-9 PDF EXCEL
S&C Slow Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SMD TCC Number 119-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-1A TCC Number 119-1-5-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-2C TCC Number 119-1-5-2 PDF EXCEL
Total Clearing 34.5 and 46 SMD-50 TCC Number 119-1-5-5 PDF EXCEL
Total Clearing 69 SMD-2B and SMD-3 TCC Number 119-1-6 PDF EXCEL
Total Clearing 69 SMD-1A TCC Number 119-1-6-1 PDF EXCEL
Total Clearing 69 SMD-50 TCC Number 119-1-6-5 PDF EXCEL
Total Clearing 115 and 138 SMD-1A and SMD-2B TCC Number 119-1-9 PDF EXCEL
S&C Very Slow Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SMD TCC Number 176-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-1A TCC Number 176-1-5-1 PDF EXCEL
Total Clearing 34.5 and 46 SMD-2C TCC Number 176-1-5-2 PDF EXCEL
Total Clearing 69 SMD-2B and SMD-3 TCC Number 176-1-6 PDF EXCEL
Total Clearing 69 SMD-1A TCC Number 176-1-6-1 PDF EXCEL
Total Clearing 115 and 138 SMD-2B TCC Number 176-1-9 PDF EXCEL

S&C Standard Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SM-4 and SM-5 TCC Number 153-4 PDF EXCEL
Total Clearing 4.6 through 14.4 SM-4 and SM-5 TCC Number 153-4-2 PDF EXCEL
Total Clearing 25 and 34.5 SM-4 and SM-5 TCC Number 153-4-4 PDF EXCEL
S&C Standard Speed for VTs
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SM-4 and SM-5 TCC Number 115-4 PDF EXCEL
Total Clearing 4.6 through 34.5 SM-4 and SM-5 TCC Number 115-4-4 PDF EXCEL
S&C Slow Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SM-4 and SM-5 TCC Number 119-4 PDF EXCEL
Total Clearing 4.6 through 14.4 SM-4 and SM-5 TCC Number 119-4-2 PDF EXCEL
Total Clearing 25 and 34.5 SM-4 and SM-5 TCC Number 119-4-4 PDF EXCEL
S&C Coordinating Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SM-4 TCC Number 179-4 PDF EXCEL
Total Clearing 14.4 SM-4 TCC Number 179-4-2 PDF EXCEL
S&C Coordinating Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SM-5 TCC Number 173-4 PDF EXCEL
Total Clearing 7.2 and 14.4 SM-5 TCC Number 173-4-2 PDF EXCEL
S&C Capacitor Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SM-5 TCC Number 174-4 PDF EXCEL
Total Clearing 14.4 SM-5 TCC Number 174-4-2 PDF EXCEL

S&C Standard Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 123-6 PDF EXCEL
Total Clearing 1 through 200 Fuse Link TCC Number 123-6-2 PDF EXCEL
S&C “K” Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 165-6 PDF EXCEL
Total Clearing 6K through 200K Fuse Link TCC Number 165-6-2 PDF EXCEL
S&C “T” Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 170-6 PDF EXCEL
Total Clearing 6T through 200T Fuse Link TCC Number 170-6-2 PDF EXCEL
S&C “KSR” Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 171-6 PDF EXCEL
Total Clearing 3KSR through 200KSR Fuse Link TCC Number 171-6-2 PDF EXCEL

 No longer available; TCC data for reference only.

S&C “QR” Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 166-6 PDF EXCEL
Total Clearing 1QR through 200QR Fuse Link TCC Number 166-6-2 PDF EXCEL
S&C “DR” Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 175-6 PDF EXCEL
Total Clearing 3DR through 20DR Fuse Link TCC Number 175-6-2 PDF EXCEL

 No longer available; TCC data for reference only.

S&C “N” Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 167-6 PDF EXCEL
Total Clearing 5N through 200N Fuse Link TCC Number 167-6-2 PDF EXCEL
S&C Coordinating Speed
Curve Type Ampere Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All Fuse Link TCC Number 172-6 PDF EXCEL
Total Clearing 101, 102, 103 Fuse Link TCC Number 172-6-2 PDF EXCEL

Fault Fiter® Electronic Power Fuse Time-Current Characteristic Curves

Compound
Curve TypeFuse TypeTCC NumberPDFExcel
Minimum Melting Fault Fiter TCC Number 420-7 PDF EXCEL
Total Clearing Fault Fiter TCC Number 420-7-2 EXCEL
Instantaneous
Curve TypeFuse TypeTCC NumberPDFExcel
Minimum Melting Fault Fiter TCC Number 400-7 PDF EXCEL
Total Clearing Fault Fiter TCC Number 400-7-2 EXCEL
Inverse
Curve TypeFuse TypeTCC NumberPDFExcel
Minimum Melting Fault Fiter TCC Number 410-7 PDF EXCEL
Total Clearing Fault Fiter TCC Number 410-7-2 PDF EXCEL
Subloop
Curve TypeFuse TypeTCC NumberPDFExcel
Minimum Melting Fault Fiter TCC Number 422-7 PDF EXCEL
Total Clearing Fault Fiter TCC Number 422-7 PDF EXCEL
Time-Delayed Compound
Curve TypeFuse TypeTCC NumberPDFExcel
Minimum Melting Fault Fiter TCC Number 421-7 PDF EXCEL
Total Clearing Fault Fiter TCC Number 421-7 PDF EXCEL


Parallel Fault Fiter® Electronic Power Fuses

Inverse
Curve TypeFuse TypeTCC NumberPDFExcel
Minimum Melting Fault Fiter TCC Number 410-7-P PDF EXCEL
Total Clearing Fault Fiter TCC Number 410-7-2-P PDF EXCEL

  Not Available. Please contact your S&C Sales Office to obtain a copy.

15 through 38 kV System Voltages
Curve TypeAmpere RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting 3, 5, 7, 10, 15, 20 Fault Tamer TCC Number 450-8 PDF EXCEL
Total Clearing 3, 5, 7, 10, 15, 20 Fault Tamer TCC Number 450-8-3 PDF EXCEL
S&C Standard Speed (12 through 22 kV System Voltages)
Curve TypeAmpere RatingsFuse TypeTCC NumberPDFExcel
Minimum Melting 1, 2, 3, 5, 7, 10, 15, 20 Fault Tamer TCC Number 123-8 PDF EXCEL
Total Clearing 1, 2, 3, 5, 7, 10, 15, 20 Fault Tamer TCC Number 123-8-3 PDF EXCEL

Information Bulletin 466-211 contains curve plots for all VacuFuse II Self-Resetting Interrupter TCCs. Data points for these curves can be found here.

Time-overcurrent relay curves marked with a star () conform to IEEE C37.112-1996, “IEEE Standard Inverse-Time Characteristic Equations for Overcurrent Relays.”

S&C Standard Speed
Curve TypeDevice TypeTCC NumberPDFExcel
Minimum Tripping S&C Overcurrent Control TCC Number 680-9 PDF EXCEL
Total Clearing S&C Overcurrent Control TCC Number 680-9-2 PDF EXCEL
S&C “K” Speed
Curve TypeDevice TypeTCC NumberPDFExcel
Minimum Tripping S&C Overcurrent Control TCC Number 681-9 PDF EXCEL
Total Clearing S&C Overcurrent Control TCC Number 681-9-2 PDF EXCEL
Tap Interrupter Speed
Curve TypeDevice TypeTCC NumberPDFExcel
Minimum Tripping S&C Overcurrent Control TCC Number 685-9 PDF EXCEL
Total Clearing S&C Overcurrent Control TCC Number 685-9-2 PDF EXCEL
Instantaneous S&C Overcurrent Control TCC Number 695-9-2 PDF EXCEL
Definite-Time Delay Speed S&C Overcurrent Control TCC Number 696-9-2 PDF EXCEL
Instantaneous and Definite-Time Delay Speed S&C Overcurrent Control TCC Number 697-9-2 PDF EXCEL
Main Interrupter Speed
Curve TypeDevice TypeTCC NumberPDFExcel
Minimum Tripping S&C Overcurrent Control TCC Number 690-9 PDF EXCEL
Total Clearing S&C Overcurrent Control TCC Number 690-9-2 PDF EXCEL
Instantaneous S&C Overcurrent Control TCC Number 695-9-2 PDF EXCEL
Definite-Time Delay Speed S&C Overcurrent Control TCC Number 696-9-2 PDF EXCEL
Instantaneous and Definite-Time Delay Speed S&C Overcurrent Control TCC Number 697-9-2 PDF EXCEL
Moderately Inverse Speed (U.S., U1)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 691-9-U1 PDF EXCEL
Inverse Speed (U.S., U2)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 691-9-U2 PDF EXCEL
Very Inverse Speed (U.S., U3)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 691-9-U3 PDF EXCEL
Extremely Inverse Speed (U.S., U4)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 691-9-U4 PDF EXCEL
Short-Time Inverse Speed (U.S., U5)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 691-9-U5 PDF EXCEL
Inverse Speed (I.E.C., C1)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 692-9-C1 PDF EXCEL
Very Inverse Speed (I.E.C., C2)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 692-9-C2 PDF EXCEL
Extremely Inverse Speed (I.E.C., C3)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 692-9-C3 PDF EXCEL
Long-Time Inverse Speed (I.E.C., C4)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 692-9-C4 PDF EXCEL
Short-Time Inverse Speed (I.E.C., C5)
Curve TypeDevice TypeTCC NumberPDFExcel
Average Tripping S&C Overcurrent Control TCC Number 692-9-C5 PDF EXCEL

Information Bulletin 680-211 contains curve plots for all Vista Overcurrent Control 2.0 TCCs. It also contains equation parameters for E-speed, T-speed, Tap, Main, IEEE, and IEC curves. Data points for K-speed curves can be found here.

Click here for the original Vista Overcurrent Control TCCs.