Amp fuses

[dodgercrazy]

Where does everybody get their fuses? I am kind of having a hard time finding exactly what im looking for. The fuse i need is a ceramic 6.5a fast blow 250v 5x20mm. None of the common hardware stores have them. Will glass fuses work? It sounds like the ceramics are much more durable.
Also, i know the purpose fuses serve, but if i was to not find what i was looking for, would it be too harmful to go up a couple amps on the fuse? For instance if i couldnt find the exact 6.5 amp fuse would it hurt to go to a 10amp fuse?

[booj]

MCM Electronics: Home and Pro Audio/Video, Security and Test Equipment

Mouser Electronics - Electronic Component Distributor

Electronic Components Distributor | DigiKey Corp. | US Home Page

US - Electronic Components Distributor | Newark.com

[dodgercrazy]

awesome thank you, they have exactly what i am looking for.

[Prairie Dawg]

Mouser has great service and delivery. If I ordered parts this afternoon I'd have them tomorrow. They're in Texas and I'm in Iowa.

[J M Fahey]

And about fuse ratings, probably specifying 6.5A is a little too exact, fuses aren't *that* precise and a 6A one , a standard value, is close enough.
Now 10 A is too much.
Remember power into a load is I (squared)*R, so that 10A one allows for twice the power dissipated into a faulty amp.
Glass should be the same as ceramic, and I fail to understand why you want a "more durable" fuse; I find it akin to padlocking the lifeboats in a passenger ship so avoid them being misplaced.
Now that we hit the iceberg, where did I put those f*ck*ng keys?

[Jazz P Bass]

As I understand it a ceramic resistor is supposed to be shatter-resistant when it fails.
ie: no pieces of glass flying.

[PepeSilvia]

As I understand it a ceramic resistor is supposed to be shatter-resistant when it fails.
ie: no pieces of glass flying.

So when are they going to come out with ceramic tubes?

[J M Fahey]

So when are they going to come out with ceramic tubes?

Will this one do?
EIMAC 3CX1200 , ceramic, fan cooled, 1200W plate dissipation.
Loves 5000V power supplies.

[Steve Conner]

Looks tough, but I bet musicians could still break it. It's a triode though, so the old trick of cranking it to 11 with the speaker disconnected won't hurt it.

Ceramic fuses are supposed to be "high rupturing capacity" - HRC for short. They're packed with some kind of sand to quench the arc rapidly. In a glass fuse breaking a heavy fault, the arc can refuse to go out, causing the fuse to explode messily. I've never seen this happen, though, and I've often substituted glass fuses when I ran out of ceramic ones.

In Europe at least, you don't get 6.5 amp ones. The nearest available value is something like 6.0 or 6.3. Fuses are terribly inaccurate, so it doesn't really matter.

[dodgercrazy]

Actually I mistyped it, it's a 6.3. I found the ones I was looking for online and ordered some, but I didn't know if there were common stores that I wouldn't think of selling them. Im just too impatient and I don't want to wait fOr them to ship lol

[Fragger]

Reassure me here people... is there any reason not to replace... let`s say for example, a 1A 125V fuse with a 1A 250V fuse?

[Steve Conner]

Don't think so. A 250V part could only be better at quenching arcs than a 125V one, think of it as an upgrade.

[Jazz P Bass]

"VOLTAGE RATING The voltage rating of a fuse is NOT an indication of the voltage the fuse is designed to withstand while carrying current. The voltage rating indicates the ability of the fuse to quickly extinguish the arc after the fuse element melts and the maximum voltage the open fuse will block. In other words, once the fuse has opened, any voltage less than the voltage rating of the fuse will not be able to "jump" the gap of the fuse. Because of the way the voltage rating is used, it is a maximum rms voltage value. You must always select a fuse with a voltage rating equal to or higher than the voltage in the circuit you wish to protect."
Link: TIME DELAY RATING

[Enzo]

It blows my mind, but fuses are one of the things that seem to confuse the junior techs most. On techie quizzes, you can usually get them with "How many volts would you find across a good fuse in a properly operating 120VAC circuit?" More of them than not will tell you, "120 volts." And then you have to explain why voltage doesn;t matter, a 5A fuse is watching for amps, not volts.

[Jazz P Bass]

So if you do read voltage across a mains fuse, it's open.