can someone tell me what this part is?

[North Idaho Wolfman]

Mike, you are correct, no slow blow in the 12 automotive industry. Fusible links are commonplace. Get a 30 amp resettable circuit breaker. Then when it trips you have to reset.

Yes there is it's just called a different name, time delayed fuse.
Several fuse makers have them.

 

[Tooljunkie]

There are time delay fuses,like the one in my dvom,but in all my life i havent seen one in a car or light truck.

Not something you could easily source compared to a fuse link.

Actually ,not true-i had a few in a truck a few years ago. Lit them with a match to make a huge mess out of a beaver dam. ***128540;

 

[North Idaho Wolfman]

Here is just a couple examples:

http://www.littelfuse.com/products/fuses/automotive-aftermarket-products/bolt-down-fuses/mega.aspx

http://www.littelfuse.com/products/...products/indicator-fuses/maxi-smart-glow.aspx