General HV Fuse Question 1

[ReliabilityTech]

I have a fuse that apparently has two ratings. On the datasheet for the fuse on the SIBA site, it has a rated current of 140A. It was sold to my group as a 250A fuse.
SIBA 3019614.250
The In = 250RC140A
My understanding is that this is a 140A rated fuse with the 250A referring to the designation of the time-current characteristics of the fuse.
How can this be sold as a 250A rated fuse?
Maybe I'm not completely understanding the two ratings.
Any help or explanation would be appreciated.

 

[7anoter4]

At first go to this link:

https://pdf.directindustry.com/pdf/siba/transformer-protection-power-circuits/19829-428693.html

If you read the notes below the table on the first page you will see the following:
Some of 55k type fuse-links have deviating designations for example 160Rc140.Here the first value indicates the characteristic curve of the respective fuse-link in this example 160 A. Rc[Rated current] are followed by the rated current taking into consideration the maximum permissible heating of the fuse under standard conditions.
Then In = 250RC140A it means 250 is the reference characteristic curve and 140 A it is the rated current. See:

http://www.siba-fuses.com/upload/documents/catalogues/HHD-Sicherungen.pdf

page no.33

 

[ReliabilityTech]

Thank you very much!

This is very confusing especially since the "250" portion is in bold and the "RC140" is smaller on the fuse's label.

Might explain why we were seeing temperatures >110C!!!

Our thermal imaging camera lens only goes to 110C.

Thanks again for your explanation.