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 |
|
|