Fuse Class Chart

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Hello all
I have been asked by a few of the electricians here on the campus about what class fuse to use for certain applications. I think most of the time we put the like for like back in if a fuse blows. Honestly I m not that up on fuse class and which one is best for which application. Is there a chart or table or website that could make it a little more clear on what class is used for what application out there? I understand the 240v size versus the 600v size fuses and what disconnects to use. Also realize the 30amp to 60amp and bigger amp disconnects out there. Any info would be very helpful.
thanks
 
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