Fuses

Submitted: Friday, May 30, 2008 at 16:32
ThreadID: 58184 Views:2082 Replies:4 FollowUps:3
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What I hope is a simple question for the experts. I wish to place a serious fuse between vehicle battery and auxiliary battery in slide on camper. I have a "mega fuse" which is a couple of terminals with space to take a proprietary fuse between them. The question: The fuses are marked 100amp which seems about what I want, but they appear to be for a 32 Volt system. Does that mean they would be about 300amp fuse in a 12 volt system or doesn't the voltage matter?

Would appreciate advice, seems to me ignorance would not be bliss if I get this wrong.

Thanks Terry
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Reply By: Member - res.q.guy (VIC) - Friday, May 30, 2008 at 16:45

Friday, May 30, 2008 at 16:45
Hi Terry
The 100 A fuse will be ok
Have you thought of a circuit breaker instead ?
No need to carry spare fuses, just reset.
Have a look at :
http://www.jaycar.com.au/index.asp
and search for Cat No: SF2266
I use them on my 4WD and we use them on our fire trucks.
Regards
Neil
AnswerID: 306777

Follow Up By: Member - Terry G (NSW) - Friday, May 30, 2008 at 16:55

Friday, May 30, 2008 at 16:55
Thanks for the help Neil.

I thought about circuit breakers but heard they could? fuse the points together in some circs, put me right off them - but they sure look simpler.


Thanks again, Terry
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FollowupID: 572678

Reply By: Tony MD - Friday, May 30, 2008 at 17:51

Friday, May 30, 2008 at 17:51
An HRC mains type fuse at 100 amps would also be suitable & you should be looking at fusing both ends of the link cable. These fuses can have large terminals with bolt holes for cable connections. Use heat shrink sleeving for insulating if required. Available from your Electrical Wholesaler.
Cheers, Tony - registered electrical contractor.
AnswerID: 306785

Follow Up By: Member - Terry G (NSW) - Friday, May 30, 2008 at 18:18

Friday, May 30, 2008 at 18:18
Thanks Tony. The difference in voltage worried me but apparently shouldn't have. I will fuse both ends and get some heat shrink stuff

regards Terry
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FollowupID: 572692

Follow Up By: Mainey (wa) - Friday, May 30, 2008 at 20:17

Friday, May 30, 2008 at 20:17
Terry
you can get the HRC fuses with the correct lugs solid soldered to each end, I use them on my battery system.

Mainey . . .
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FollowupID: 572713

Reply By: Mike Harding - Friday, May 30, 2008 at 18:49

Friday, May 30, 2008 at 18:49
The voltage rating of a fuse is only relevant in regard to the maximum voltage it should be exposed to. ie. It's OK to use a 250 volt 10 amp fuse as a 10 amp fuse on a 12 volt system but it is _not_ OK to use a 12 volt 10 amp fuse in a 250 volt system.

Mike Harding
AnswerID: 306804

Reply By: Member - Terry G (NSW) - Wednesday, Jun 04, 2008 at 08:15

Wednesday, Jun 04, 2008 at 08:15
Thanks everyone for the additional info, proceeding as advised.

Terry
AnswerID: 307666

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