Using External Amp Fuses ?

[95Prober 10+ year member]

Hi guys

I was wondering, if youre usuing a huge mono amp and it calls for external fuses, is there any formula to figure out the correct total size in fuses to use with regards to the power ratings of the amp? I dont have the manual or spec sheet.

I have an external block which can hold like 4 of the small round glass type fuses

like these:

http://cgi.ebay.com/AGU-60-AMP-Lot-of-10-Fuses-New-In-Box-Free-Shipping_W0QQitemZ360059881017QQihZ023QQcategoryZ50551QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

rather than the blade fuses.

Thanks

Click to read more...

 

[jrwalte 10+ year member]

Is this because the amp doesn't have internal fuses or it is just recommending to also fuse the incoming power wire on top of its internal fuses?

 

[BoomBoomBoy 10+ year member]

Yeah there is a formula. It is:

Watts of amp divided by car voltage equals needed fuse size in amperes.

Example

1200W / 12V = 100A fuse size.

 

[djman37 5,000+ posts]

are the amps the Zenons in your sig? what are the power inputs?? 1 or 2, 1/0 or 4ga.

btw, i'm guessing 200A fusing, no glass allowed.

 

[BoomBoomBoy 10+ year member]

are the amps the Zenons in your sig? what are the power inputs?? 1 or 2, 1/0 or 4ga.
btw, i'm guessing 200A fusing, no glass allowed.

He's not asking about fusing the power cable, he's talking about fusing the amplifier.

 

[djman37 5,000+ posts]

He's not asking about fusing the power cable, he's talking about fusing the amplifier.

i know that, but if he has 2 1/0 inputs, that's gonna be MORE fusing. I'm hoping to get some idea of the input current Zenon was allowing for also.

fusing 4 ga at 250A wouldn't be the best idea either

Does the amp have internal protection for current draw already? oh wait, no manual.

 

[mokedaddy 5,000+ posts]

He's not asking about fusing the power cable, he's talking about fusing the amplifier.

But if he is using two 2200 watt amps, the glass fuses arent going to cut it. I think that is the point he was trying to make. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[BoomBoomBoy 10+ year member]

But if he is using two 2200 watt amps, the glass fuses arent going to cut it. I think that is the point he was trying to make. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

You're making "if" assumptions. Let's just stick to what he was asking. It's never a bad idea to externally fuse an amp if it doesn't have built in fusing, particularly if he's already running a distribution block. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[mokedaddy 5,000+ posts]

You're making "if" assumptions. Let's just stick to what he was asking. It's never a bad idea to externally fuse an amp if it doesn't have built in fusing, particularly if he's already running a distribution block. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Stop with the freaking semantics. Nobody said dont fuse. His fuses arent going to work.

/thread.

 

[95Prober 10+ year member]

sorry guys, i should clarify a bit better. the amp in question isnt the ones in my sig.

i have 2 pos. and 2 ground inputs and no idea of what the fusing should be.

well, i do have some specs from the spec sheet, but nothing about external fuse sizes.

the amp is rated at:

1250RMS x 1 @ 4ohms

2250RMS x 1 @ 2ohms

3450RMS x 1 @ 1 ohm

all tested at 13.8V acoording to the sheet

@djman37..... why do you say no glass allowed? and wouldnt 4x50amp fuses work as well as a single 200amp blade fuse, assuming it asks for 200amps of fusing?

also...

i got 0/1 guage running to the rear. should i split it into 2- 4guages for both the positive and negative dual-inputs or must i run 2 runs of 0/1 guage in both pos./neg. inputs ??

thx for the help!

 

[BoomBoomBoy 10+ year member]

Stop with the freaking semantics. /thread.

I'm sorry you can't differentiate facts from semantics. Read, think, post! //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[mokedaddy 5,000+ posts]

sorry guys, i should clarify a bit better. the amp in question isnt the ones in my sig.
i have 2 pos. and 2 ground inputs and no idea of what the fusing should be.

well, i do have some specs from the spec sheet, but nothing about external fuse sizes.

the amp is rated at:

1250RMS x 1 @ 4ohms

2250RMS x 1 @ 2ohms

3450RMS x 1 @ 1 ohm

all tested at 13.8V acoording to the sheet

@djman37..... why do you say no glass allowed? and wouldnt 4x50amp fuses work as well as a single 200amp blade fuse, assuming it asks for 200amps of fusing?

Glass fuses only go to 100 amps. You will need probably upwards of 400 amps of fusing for each amp being they are over 3000 watts. You can uses fuses like what you want though you would have to split two wires into four fuses which isnt ideal. Get four cheap fuse holders (parts express) and four 200 amp blade fuses.

 

[mokedaddy 5,000+ posts]

I'm sorry you can't differentiate facts from semantics. Read, think, post! //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

But I was right. So much for facts.... //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[BoomBoomBoy 10+ year member]

But I was right. So much for facts.... //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

So far in every post you've failed to be right. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

/thread

Now stop your trolling and let the OP get his answer you stinking bum. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[mokedaddy 5,000+ posts]

So far in every post you've failed to be right. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
/thread

Now stop your trolling and let the OP get his answer you stinking bum. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

Yet you cant prove me wrong. //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

And he got his answer. Reading>you.