SMU-20® and SMU-40® Fuse Units Time-Current Characteristic Curves

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
Total Clearing 4.8 SMU-40 TCC Number 153-2-1-4
Total Clearing 14.4 SMU-20 TCC Number 153-2-2
Total Clearing 14.4 and 25 SMU-40 TCC Number 153-2-3-4
Total Clearing 25 and 34.5 SMU-20 TCC Number 153-2-4

 

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
Total Clearing 4.8 through 25 SMU-40 TCC Number 115-2-3-4
Total Clearing 14.4 through 34.5 SMU-20 TCC Number 115-2-4

 

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
Total Clearing 4.8 SMU-40 TCC Number 119-2-1-4
Total Clearing 14.4 SMU-20 TCC Number 119-2-2
Total Clearing 14.4 and 25 SMU-40 TCC Number 119-2-3-4
Total Clearing 25 and 34.5 SMU-20 TCC Number 119-2-4

 

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
Total Clearing 14.4 SMU-20 TCC Number 176-2-2
Total Clearing 25 and 34.5 SMU-20 TCC Number 176-2-4

 

S&C “K” Speed
Curve Type kV Nom. Ratings Fuse Type TCC Number PDF Excel
Minimum Melting All SMU-20 TCC Number 165-2
Total Clearing 14.4 SMU-20 TCC Number 165-2-2
Total Clearing 25 and 34.5 SMU-20 TCC Number 165-2-4

 

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