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A Fuse question

I just purchased a Magnum Dynalab Integrated Amp model #MD 308
I always check fuses for correct value before using.
This unit states on the back "3AG fuse " however it does not state the amperage
The fuse that is in it says : 250 v.... 4A
I checked manual to verify the correct fuse amperage is in it ( 4 amp ? ).....but manual does not 
indicate amperage!
Does anyone have this info I am seeking. 
Perhaps an owner of this amp could check and verify for me.
Thank you 
rocky1313
5 responses Add your response
oldhvymec
5,101 posts
 
3AG is a 3 amp slow blow fuse.

4A is probably a fast blow. Single wire or one coiled around the other, kinda looks like a spring... That is a slow blow..

The straight wire fast action fuse..

Regards
gs5556
1,234 posts
 
Why not call MD directly and ask? 
georgehifi's avatar
georgehifi
10,312 posts
 
If it is 3amp and doesn't blow, then it's going to protect better than a 4amp one will.

Cheers George
imhififan's avatar
imhififan
2,181 posts
 
" 3AG fuse " is a size of Ø 1/4" X 1-1/4" length glass fuse, it available in fast acting or slow blow with different voltage/amp rating.

https://www.parts-express.com/littelfuse-4a-3ag-slow-blow-fuse-5-pcs--071-704

FYI, if you want a ceramic fuse, look for " 3AB fuse " instead.
rodman99999
6,130 posts
 
Imhififan is correct in that, "3AG" only represents the fuse’s physical size/material.   Nothing to do with electrical specs (ie: amperage, voltage or time characteristics).          "AG" is actually short for, "Automobile Glass", and, "AB": either Bakelite, fiberglass or ceramic.        https://www.littelfuse.com/~/media/electronics/application_guides/littelfuse_fuseology_application_g...        Contacting Magnum Dynalab is your best recourse:       http://www.magnumdynalab.com/contact/
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