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#4537866 - 10/09/17 10:51 AM Looking for a fuse time curve
Quattro Pete Offline


Registered: 10/30/02
Posts: 35845
Loc: Great Lakes
I'm looking at a DMM that uses a 10A/600V (5 x 20mm) fast blow fuse. That's all the info I've got. I'm having a hard time googling a time curve for it. Is it because this is insufficient information to identify this fuse?

I'm trying to understand for how long I can continuously monitor a 3 Amp DC current without blowing this fuse.

Thanks!
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#4537881 - 10/09/17 11:02 AM Re: Looking for a fuse time curve [Re: Quattro Pete]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
Well at 3A a 10A fuse should never blow.

Here's a fuse chart and their meanings.

http://bussfuses.net/
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#4537893 - 10/09/17 11:14 AM Re: Looking for a fuse time curve [Re: Quattro Pete]
mk378 Offline


Registered: 09/27/15
Posts: 1414
Loc: USA
The time curve describes how quickly the fuse will blow at various currents above the fuse rating. Currents below the rating can be carried indefinitely.

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#4537910 - 10/09/17 11:25 AM Re: Looking for a fuse time curve [Re: Quattro Pete]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35845
Loc: Great Lakes
Got it. Thanks.
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#4537986 - 10/09/17 12:47 PM Re: Looking for a fuse time curve [Re: Quattro Pete]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 705
Loc: Canada


Key point is stick with FB fuses, a SB fuse even with a lower rating will blow the internal fuse.

If the DMM is an expensive one, it may have a internal fuse too that's hard or expensive, like a
Buss "BBS-_" Midget cartridge 'meter' fuse costing $15 - $23 each!

Figure that SB fuses are 4 -5 times slower and pass higher current before letting go.

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#4538503 - 10/09/17 08:50 PM Re: Looking for a fuse time curve [Re: Quattro Pete]
George Bynum Offline


Registered: 12/18/04
Posts: 283
Loc: Greenville SC
Originally Posted By: Quattro Pete
I'm looking at a DMM that uses a 10A/600V (5 x 20mm) fast blow fuse. That's all the info I've got. I'm having a hard time googling a time curve for it. Is it because this is insufficient information to identify this fuse?

I'm trying to understand for how long I can continuously monitor a 3 Amp DC current without blowing this fuse.

Thanks!


I don't know who makes it, and until my friend Google came through would have bet there were no 600V fuses that size ... but see http://cci-parts.com/product_info.php?manufacturers_id=&products_id=317.

As others have said, a 10A fuse will carry 10A "forever"

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#4538555 - 10/09/17 10:06 PM Re: Looking for a fuse time curve [Re: George Bynum]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35845
Loc: Great Lakes
Originally Posted By: George Bynum
As others have said, a 10A fuse will carry 10A "forever"

So what's this warning in the DMM owners manual all about?

Quote:
Input Limits:
10A Current AC or DC: 30 seconds max. every 15 minutes)
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#4538655 - 10/10/17 02:25 AM Re: Looking for a fuse time curve [Re: Quattro Pete]
edhackett Offline


Registered: 06/09/03
Posts: 1925
Loc: Sequim, WA
Originally Posted By: Quattro Pete
Originally Posted By: George Bynum
As others have said, a 10A fuse will carry 10A "forever"

So what's this warning in the DMM owners manual all about?

Quote:
Input Limits:
10A Current AC or DC: 30 seconds max. every 15 minutes)



That's the limitation of the meter's circuitry. It's been my experience that cheap meters serve as protection for the fuse.

The Fluke 170 series, for example is also rated at 10A AC or DC. They can read an overload of 20A for 30 seconds. That's just one differences when you step up to a quality meter.

Ed
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#4538795 - 10/10/17 07:42 AM Re: Looking for a fuse time curve [Re: Quattro Pete]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35845
Loc: Great Lakes
Thanks. But if I just pass 3A current through the meter, can I do it indefinitely?
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#4539095 - 10/10/17 12:55 PM Re: Looking for a fuse time curve [Re: Quattro Pete]
George Bynum Offline


Registered: 12/18/04
Posts: 283
Loc: Greenville SC
You should be able to with no problem. Power (heat) is proportional to current squared, so 3 amps would generate about 10% as much heat as 10 amps. The 30 seconds every 15 minutes sounds like a hear issue.

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#4540022 - 10/11/17 10:19 AM Re: Looking for a fuse time curve [Re: Quattro Pete]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
Originally Posted By: Quattro Pete
Originally Posted By: George Bynum
As others have said, a 10A fuse will carry 10A "forever"

So what's this warning in the DMM owners manual all about?

Quote:
Input Limits:
10A Current AC or DC: 30 seconds max. every 15 minutes)

Probably more because of the wire size of the leads.
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#4540024 - 10/11/17 10:24 AM Re: Looking for a fuse time curve [Re: George Bynum]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35845
Loc: Great Lakes
Originally Posted By: George Bynum
The 30 seconds every 15 minutes sounds like a hear issue.

A hear issue?
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#4540196 - 10/11/17 01:06 PM Re: Looking for a fuse time curve [Re: Quattro Pete]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 705
Loc: Canada

"Input Limits:
10A Current AC or DC: 30 seconds max. every 15 minutes)"


The reason for this is a cheap meter will have a "shunt resistor" to get a voltage drop that
indicates the current. They get hot. so that's the reason for the time limits.

On expensive DMMs, they'll have a current shunt made from Manganin alloy (84% copper, 12% manganese, and 4% nickel)
that can handle a full current with no time limits. The alloy allows accurate measurements
even when the shunt gets warm.

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#4540406 - 10/11/17 04:28 PM Re: Looking for a fuse time curve [Re: Quattro Pete]
George Bynum Offline


Registered: 12/18/04
Posts: 283
Loc: Greenville SC
hear here ... I'm not hot unlike the HEAT I should have used. Thanks for catching my mistake.

George

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#4540421 - 10/11/17 04:57 PM Re: Looking for a fuse time curve [Re: George Bynum]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35845
Loc: Great Lakes
Originally Posted By: George Bynum
hear here ... I'm not hot unlike the HEAT I should have used. Thanks for catching my mistake.

George

Thanks for clarifying.

I wasn't trying to nitpick. I figured it was a typo, but I truly couldn't figure out what it was supposed to be. Now it all makes sense. Thank you. smile
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