S&C Electric Company

Time-Current Characteristic Curves

SMU-20 and SMU-40 Fuse Units, Indoor and Outdoor Distribution

For your convenience, S&C’s TCC Curves have been saved in Adobe® PDF and Microsoft® Excel formats. To view the PDFs online, you’ll need Adobe’s Acrobat® Reader® software, available for free download at Adobe’s website.

S&C Standard Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
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 Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
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 Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
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 Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
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 Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
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 Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SMU-20 TCC Number 175-2 PDF Excel
Total Clearing 14.4 SMU-20 TCC Number 175-2-2 PDF Excel