Is it safe to use a higher amperage rating fuse?


Today was my 2nd attempt at trying out Synergistic Research fuses.  About 3 years ago when I had separates, including mono block amps, I bought a set of Blue fuses.  One component had a mfg spec of 250mA and the retailer said go with 315mA.  My two mono block amps each had a 6.3A.  When I installed them one of them blew upon powering up.  The retailer said we should go up to the next rating.  I was a bit frustrated at the experience and didn't feel comfortable putting higher values in my expensive components.  I felt these expensive fuses should be made to tighter tolerances than the cheap BUSS fuses I had been using.  If I remember correctly, that was the actual argument that the dealer told me.  They are mfg to tighter tolerances so a 5A SR fuse was almost dead-on 5A while a cheap fuse may actually be 5.3A or whatever.  This also was a bit confusing at the time so I sent them all back.

Okay...3 years have passed and now I have a single integrated amp which has a 5A fuse.  Much less to invest in the upgrade so I ordered an Orange.  It came in today...installed....pressed power...on and off went the amp.  DAMN!!  I contacted the retailer and SR on the same email.  This was a different dealer from 3 years ago.  The retailer said I should go to the next value up.  I said no and and they are waiting for the tracking info of my return shipment.

I did a quick search of my question before posting and saw a thread about the Red fuses and someone said they had to do the exact same thing.  Is everyone putting higher rated fuses in their gear that is worth thousands of dollars?  Is there no risk in this?  I admit that I don't know what could actually happen from that.  It seems that other things could burn up if a higher amperage fuse is in place.  I am compelled to simply stick to the mfg specs for something that I don't understand because I don't want to create problems just from a simple tweak.

Should I let them ship me a 6.3A or just be done with this?
dhite71

clearthink
1,213 posts
04-28-2021 12:37pm
dletch2"Typical breaker has 3x or more the resistance of a fuse for a given current rating at room temperature"

That may be accurate, true, and valid in you're country but it is completely false, mistaken, and wrong in many parts of the world and I even doubt it's truth where you live.



I see you are up to your lies again @clearthink.  Or should I say trolling.  Are you so obtuse to think it is not obvious?   You make this same response to my posts, we are up to what 5 now?  You NEVER back up your words with any facts. That would imply you are lying.   The question is, WHY ARE YOU MISLEADING PEOPLE HERE?    It does not matter where you live, breakers have more resistance than fuses. 
It seems to be a common experience with the expensive fuses of all brands, I can’t quite see why that would be.

Call me cynical, but I suspect expensive fuses blow frequently because the manufacturers want to sell you some more of their expensive fuses. 
And here I just thought it was miss-rating and lack of quality control. 
@grannyring 
Do you have any more detail on the use of breakers? I've never tried them, but on the face of it it does seem like a good idea and I'd like to explore. 

Thanks
I'm confused (get it)? What am I missing?
OP stated 250mA fuse (1/4 of 1A)
Suggested a 5A (20 times the mfg suggested current and still blows?)
Did I miss something or is something really wrong here? I'm not an electrician, but I did stay at a Holiday Inn last night.  AB