What is an E-rated Fuse?

[fuse_puller]

Hello,
I have a few questions for the maintenance panel here. First of all, what is an E-rated fuse? One of my colleagues was discussing some technical things about fuses and now he has me wondering.

--- E-Rated Fuses ---

Thanks!

[Cheller]

Again, I actually went researching for E-rated fuses...

E-Rated fuses are designed for use with transformers, power centers, and sub-stations. They are essentially a time delay fuse.

The NEMA Standards for E-rated fuses are as follows: They require that fuses open within 300 seconds when exposed to an RMS value of 200-240% of the fuse's current rating. It translates to a time delay fuse that is capable of an extended period of excessive current.