Jump to content

fuses-fast acting vs slow blow

Recommended Posts

A fast acting fuse will be fine for a temporary cure. A fast acting fuse blows the second its current rating is reached. A slow acting fuse can tolerate rated curent for a few seconds to get you past a musical peak before it blows.


Link to comment
Share on other sites

It used to be that you could find just about any fuse, fast or slow blow at the discount stores, but, alas, that is now seldom the case...BUT you can try most automotive stores and get your fuse there...just be sure to have to the old one with you or its full alpha/numeric and brand nomenclature so they can get the correct one for you.

I would suggest getting a few of them and taping a spare in some inconspicuous place on the piece of equipment to keep it handy.


I can now receive private messages

Link to comment
Share on other sites

Like John says, it is safe to use a fast acting fuse in place of a slow blow. It just might fail where the slow blow would survive when you get close to its limits. Replacing a fast acting fuse with a slow blow usually isn't a good idea, however.

A fast acting fuse doesn't actually blow as soons as its current rating is reached. If you were to look at the ratings of a garden variety fast acting fuse, you might see ratings of a few hours at 100% current, a few seconds at 200% current, and a curve in between. Slow blow fuses just give you a little extra leeway over fast acting fuses to handle starting current, like charging power supply capacitors.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...