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K Type Fuse Specification
2

K Type Fuse Specification

K Type Fuse Specification

(OP)
Anyone knows what the ANSI requirements are for a K type high voltage fuse? I am currently writing a purchasing spec for k Type fuses and is not sure how to describe the K ratings? does the K represents a specific speed ratio or is it just a descriptive term?

Thanks

RE: K Type Fuse Specification

Refer to the following:

http://www.apsllc.net/Cooper%20Power/K-SEC%20100.pdf

MV fuses open in a several seconds (like 300) at 150-200% of the K-rating current in amps. Review published fuse curves for K links that should give a good idea.

You also need to coordinate for transforer inrush, if fed by the fuse (must withstand 12 times FLA for 0.1 sec). Plus need to coordinate with upsream/downstream overcurrent devices too.

Not aware of ANSI standard, but I know utiltiy companies often apply K links at much higher loads (150 to 200%) of of its K-rating.

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