The rated value of the fuse holder is broken

The rated value of the fuse holder is broken

The fuse has an interruption rating, but the fuse holder does not actually interrupt the current; Therefore, they will not have a short-circuit current rating. Generally speaking, the fuse holder standards for electronic, miniature, or supplementary fuses have default ratings. For example, a fuse holder certified by  UL4248 will reach a rated value of 10kA. The fuse holder for supplementary fuses can be evaluated according to UL 4248 to achieve higher short-circuit current ratings, even up to 100 kA.

Do fuse holders require derating?

Generally speaking, yes.  For UL ratings, a derating factor is in line with fuse derating of 80 percent but could be more depending on additional environmental or operating factors such as temperature and/or current cycling.

What are the standards that govern fuse holders?

UL 4248 and IEC 60127-5 are the two primary standards that govern fuse holders. For electronic fuse holders, UL only offers UL Recognition to UL 4248. Third party governing bodies, such as VDE or SEMKO can certify fuse holders to the IEC standard. Depending on if the end assembly is pursuing a 3rd party certification, such as UL or VDE, a fuse holder evaluated and certified to either one of these standards can help support the end assembly certification.; however 3rd party certifications may not required.