High voltage fuse link type SSK complements the existing product range. The field of application is in switchgear with low ratings for breaker opening times and take-over currents in use upstream of transformers rated 630 kVA or above.In the case of smaller transformers,standard fuse links can be used, because the ratio of the fuse take-over current to the rated take-over current of the breaker is more favourable.

The selection of the fuse links for distribution transformer protection is done according to the fuse manufacturers recommendation in conjunction with VDE 0670-402. The manufacturers of the load break switches however, recommend ratings according VDE 0670-303 and/or IEC 60 420 in line with their certification.The application of both standards will thus deliver two fuse link ratings, which are not identical. In these cases, the application of the new SSK type high voltage fuse link made by SIBA, will solve the problem.

When designing the new fuse link, the main objective was to reduce the melting times<100 ms without negative impact on any other fuse parameter.Ther power loss at the rated current is 70-75 W only, which is beneficial for the switchgear manufacturer. Furthermore, the extremely low minimum breaking current of only 3,5 x rated current is identical to the SIBA standard rangs fuse links.

In summary, the advantages of the SSK type fuse link are as follows: