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Looking for a fuse time curve #4537866
10/09/17 10:51 AM
10/09/17 10:51 AM
Joined: Oct 2002
Posts: 36,293
Great Lakes
Quattro Pete Offline OP
Quattro Pete  Offline OP
Joined: Oct 2002
Posts: 36,293
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!


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)
Re: Looking for a fuse time curve [Re: Quattro Pete] #4537881
10/09/17 11:02 AM
10/09/17 11:02 AM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
Illinois
Well at 3A a 10A fuse should never blow.

Here's a fuse chart and their meanings.

http://bussfuses.net/


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Looking for a fuse time curve [Re: Quattro Pete] #4537893
10/09/17 11:14 AM
10/09/17 11:14 AM
Joined: Sep 2015
Posts: 1,526
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,526
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.

Re: Looking for a fuse time curve [Re: Quattro Pete] #4537910
10/09/17 11:25 AM
10/09/17 11:25 AM
Joined: Oct 2002
Posts: 36,293
Great Lakes
Quattro Pete Offline OP
Quattro Pete  Offline OP
Joined: Oct 2002
Posts: 36,293
Great Lakes
Got it. Thanks.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)
Re: Looking for a fuse time curve [Re: Quattro Pete] #4537986
10/09/17 12:47 PM
10/09/17 12:47 PM
Joined: May 2016
Posts: 717
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 717
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.

Re: Looking for a fuse time curve [Re: Quattro Pete] #4538503
10/09/17 08:50 PM
10/09/17 08:50 PM
Joined: Dec 2004
Posts: 297
Greenville SC
George Bynum Offline
George Bynum  Offline
Joined: Dec 2004
Posts: 297
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"

Re: Looking for a fuse time curve [Re: George Bynum] #4538555
10/09/17 10:06 PM
10/09/17 10:06 PM
Joined: Oct 2002
Posts: 36,293
Great Lakes
Quattro Pete Offline OP
Quattro Pete  Offline OP
Joined: Oct 2002
Posts: 36,293
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)


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)
Re: Looking for a fuse time curve [Re: Quattro Pete] #4538655
10/10/17 02:25 AM
10/10/17 02:25 AM
Joined: Jun 2003
Posts: 1,950
Sequim, WA
edhackett Online content
edhackett  Online Content
Joined: Jun 2003
Posts: 1,950
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


Never attribute to engineers that into which politicians, lawyers, accountants, and marketeers have poked their fingers.
Re: Looking for a fuse time curve [Re: Quattro Pete] #4538795
10/10/17 07:42 AM
10/10/17 07:42 AM
Joined: Oct 2002
Posts: 36,293
Great Lakes
Quattro Pete Offline OP
Quattro Pete  Offline OP
Joined: Oct 2002
Posts: 36,293
Great Lakes
Thanks. But if I just pass 3A current through the meter, can I do it indefinitely?


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)
Re: Looking for a fuse time curve [Re: Quattro Pete] #4539095
10/10/17 12:55 PM
10/10/17 12:55 PM
Joined: Dec 2004
Posts: 297
Greenville SC
George Bynum Offline
George Bynum  Offline
Joined: Dec 2004
Posts: 297
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.

Re: Looking for a fuse time curve [Re: Quattro Pete] #4540022
10/11/17 10:19 AM
10/11/17 10:19 AM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
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.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Looking for a fuse time curve [Re: George Bynum] #4540024
10/11/17 10:24 AM
10/11/17 10:24 AM
Joined: Oct 2002
Posts: 36,293
Great Lakes
Quattro Pete Offline OP
Quattro Pete  Offline OP
Joined: Oct 2002
Posts: 36,293
Great Lakes
Originally Posted By: George Bynum
The 30 seconds every 15 minutes sounds like a hear issue.

A hear issue?


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)
Re: Looking for a fuse time curve [Re: Quattro Pete] #4540196
10/11/17 01:06 PM
10/11/17 01:06 PM
Joined: May 2016
Posts: 717
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 717
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.

Re: Looking for a fuse time curve [Re: Quattro Pete] #4540406
10/11/17 04:28 PM
10/11/17 04:28 PM
Joined: Dec 2004
Posts: 297
Greenville SC
George Bynum Offline
George Bynum  Offline
Joined: Dec 2004
Posts: 297
Greenville SC
hear here ... I'm not hot unlike the HEAT I should have used. Thanks for catching my mistake.

George

Re: Looking for a fuse time curve [Re: George Bynum] #4540421
10/11/17 04:57 PM
10/11/17 04:57 PM
Joined: Oct 2002
Posts: 36,293
Great Lakes
Quattro Pete Offline OP
Quattro Pete  Offline OP
Joined: Oct 2002
Posts: 36,293
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


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)

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