Circuit breaker v Fuse

Submitted: Thursday, Aug 28, 2008 at 17:21
ThreadID: 61161 Views:3215 Replies:5 FollowUps:7
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Installation instructions of brake controller say use a circuit breaker.

Installation of radio says use a fuse.

I realize the two bits of equipment are different but was wondering about the use of them. Could I use a circuit breaker on my radio instead of a fuse or a fuse on my brake controller.

What is the appropriate time to use a circuit breaker and what is the appropriate time to use a fuse???????????

Alan
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Reply By: Member - Serg (VIC) - Thursday, Aug 28, 2008 at 17:31

Thursday, Aug 28, 2008 at 17:31
In my strongest opinion circuit breakers are rubbish. Use to have few of them installed in car and finished ditching all of them in favor of fuses. Electronic one probably better, but mechanical one definitely rubbish.

Cheers
Serg
AnswerID: 322663

Reply By: Member - Graham H (QLD) - Thursday, Aug 28, 2008 at 17:50

Thursday, Aug 28, 2008 at 17:50
My understanding of the two is that a circuit breaker stops an overload and resets afterwards good as in the case of your brakes.

Or not good in the case of your radio if the fault was still there and it happened again

A fuse blows and therefore you would have no brakes but would stop the fault recurring in the radio.

Someone will doubtless correct me on this.
AnswerID: 322668

Reply By: Max - Sydney - Thursday, Aug 28, 2008 at 18:01

Thursday, Aug 28, 2008 at 18:01
Alan

The fuse gives best protection - something goes wrong and the circuit switches off till you change the fuse and hopefully fix the problem.

In the case of the brake controller, a total lack of brakes on the van could be a worry, so they recommend a self resetting breaker instead of a fuse. I'm with Serge - I doubt the value of a device that resets without the problem being fixed. However, that's what is specified and I guess it will stop the car wiring or battery from cooking if there is a short.

They are not expensive and you need to comply with manufacturers' instructions to protect your insurance in event of a problem, so just do it.

But use fuses for everything else because they force you to fix the problem before putting a new fuse in.

Max
AnswerID: 322673

Reply By: Affordable Batteries & Radiators - Thursday, Aug 28, 2008 at 20:46

Thursday, Aug 28, 2008 at 20:46
Auto reset on electric brakes !!!

Please guys....

Down hill with no brakes could be a problem with a fuse that does not mend or auto reset.

Radios, lights and sensitive gear a fast blow fuse is best.



AnswerID: 322721

Follow Up By: Member - Serg (VIC) - Thursday, Aug 28, 2008 at 21:11

Thursday, Aug 28, 2008 at 21:11
Well, it is quite moot point actually. No-one auto-resetting circuit breaker cat reset itself immediately – usually it takes minutes, like 3 to 5. Also many need to be reset manually. Circuit breaker has no real advantages except that you do not need to have spare fuse. Proper fuse it better, as least because it has lower internal resistance.

Cheers
Serg
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FollowupID: 589767

Follow Up By: Member - Norm C (QLD) - Thursday, Aug 28, 2008 at 21:27

Thursday, Aug 28, 2008 at 21:27
Except that Derek (and the brake instructions typically) specified AUTO reset. Have not yet come across an auto reset breaker that needed manual reset. But I could be wrong.

Even if it does take 3 minutes to reset, that's a lot less than the time to replace a fuse - particularly if you don't even know its blown!!

Auto reset breakers on elec brakes for sure (for me anyway)

Norm C
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FollowupID: 589775

Follow Up By: 2TommyGuns - Thursday, Aug 28, 2008 at 21:33

Thursday, Aug 28, 2008 at 21:33
"Down hill with no brakes... Mmmmmm yep, that could be a problem!!!!!!!!!!!!!!!!! LoL. Seriously though, is there such an animal as a quick reset circuit breaker? Say every 10 to 15 seconds, I wouldn't like to go without anchors to much longer than that.

2TGs

PS. I see Narva now have circuit breakers with spade fittings on them, can slot them in where the quick blow jobbies fit.
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FollowupID: 589782

Follow Up By: 2TommyGuns - Thursday, Aug 28, 2008 at 21:38

Thursday, Aug 28, 2008 at 21:38
Hi Norm.

Yes there is such an animal, was at a solar shop the other day & saw one there, the current has to be disconnected before it will reset.

Cheers 2TGs
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FollowupID: 589788

Follow Up By: 2TommyGuns - Thursday, Aug 28, 2008 at 21:45

Thursday, Aug 28, 2008 at 21:45
Norm.

I just reread your post...... Now I'm confused??? An auto reset that needed manual reset????? Begs the question, why???... Think I'll go to bed.

Cheers 2Tgs
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FollowupID: 589790

Follow Up By: Member - Norm C (QLD) - Thursday, Aug 28, 2008 at 22:22

Thursday, Aug 28, 2008 at 22:22
Wow, I'm confused as well.
2TGs, you seem to be having a conversation with yourself, but addressing them to me?????
I'm not even sure what the question is.................
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FollowupID: 589795

Follow Up By: 2TommyGuns - Thursday, Aug 28, 2008 at 23:43

Thursday, Aug 28, 2008 at 23:43
Sorry Norm.

Mate, it's been a very long day... Just ignore it!! I had another look...
WTF!!! :-\ :-/ :-\

Cheers 2TGs
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FollowupID: 589807

Reply By: autosparky - Thursday, Aug 28, 2008 at 22:55

Thursday, Aug 28, 2008 at 22:55
circuit breakers are typically bi metal strips , and depending on types of dissimilar metals , will expand (short) at set rates , and similarly contract at the softest metals rate to complete the circuit. it does not take 3-5 min to reset , circuit breakers give more safety to the wiring circuit than a fuse that will disconnect permanantley the circuit
AnswerID: 322742

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