The protective link is an oil-immersed, expulsion-type fuse used in high-voltage circuits of distribution transformers. Developed by Westinghouse for the CSP (Completely Self-Protected) system, it disconnects faulty transformers from the feeder circuit and limits damage during internal faults.
| Curve number | <=15kV | <=23kV | <=34.5kV |
| 2 | 592B581G01 | 779C667G01 | 345B995G21 |
| 3 | 592B581G02 | 779C667G02 | 345B995G29 |
| 3A | 592B581G11 | 779C667G03 | 345B995G22 |
| 4 | 592B581G06 | 779C667G08 | 345B995G33 |
| 5 | 592B581G03 | 779C667G04 | 345B995G23 |
| 5A | 592B581G12 | 779C667G09 | 345B995G24 |
| 6 | 592B581G04 | 779C667G05 | 345B995G28 |
| 7 | 592B581G05 | 779C667G06 | 345B995G25 |
| 7A | 592B581G13 | 779C667G33 | 345B995G34 |
| 8 | 592B581G07 | 779C667G07 | 345B995G26 |
| 9 | 592B581G08 | 779C667G34 | 345B995G27 |
| 10 | 592B581G09 | 779C667G35 | 345B995G31 |
| 11 | 592B581G14 | 779C667G36 | 345B995G32 |
| 12 | 592B581G31 | Not available | Not available |
| 13 | 592B581G32 | Not available | Not available |
