Time-Current Characteristic Curves

SM Refill 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	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