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40 amp 58 volt fuse

Old 04-27-2008, 02:57 PM
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Default 40 amp 58 volt fuse

While getting my boat ready for water I noticed I had a blown fuse. It is a 40A 58 volt. I have been to half a dozen marine stores and no one has ever even heard of such a fuse. The fuse is connected close to the battery and a friend says it is for the ignition relay switch. Another dealer told me that it is a special fuse used for "clean Power" on my 225 Merc Optimax with DTS controls. I called dealer that hung my motor and they know nothing about it. All the 40A fuses I find are 32 volt. I would like to replace it with what the engine came with. Any one have any info on this fuse or where I can get one? Thanks in advance.
Old 04-27-2008, 03:30 PM
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Default Re: 40 amp 58 volt fuse

I am not an engineer but current blows fuses, not voltage. I've been in electronics for over 30 years and have run across 32 volt fuses from time to time. I have put 2amp-32v fuses in 130v lines with no problems. Whenever I have asked someone wth a 32 volt fuse is they change the subject, I don't believe anyone really knows. ;? ;?
Old 04-27-2008, 04:13 PM
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Default Re: 40 amp 58 volt fuse

agreed - call merc at 920-929-5000 and ask for cust service - I would not even think about about it and put in a 40A blue seas breaker - DTS takes very little volts/amps...get some real tech help at veradoclub.com or from sherm at bassboatcentral.com
Old 04-27-2008, 04:37 PM
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Default Re: 40 amp 58 volt fuse

The voltage rating on a fuse is for "flash over", that is, the ability of electricity to jump a gap (that of the blown elements inside the fuse). Some high voltage fuses are filled with special compounds to prevent this.

A fuse cannot produce, or have anything to do with "clean power".

The suggestion to call the manufacturer is a good one, but there is a possibility that the fuse blew for a reason so you may want to have more than one and if the first one blows you will need to find out why.

If they are the same physical size, I would be comfortable using a 32 volt fuse. Your boat's electrical system is 12 volts so there's plenty of margin.
Old 04-28-2008, 08:49 AM
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Default Re: 40 amp 58 volt fuse

A 32 volt fuse will be just fine. Just an operating spec for the fuse, you can always go up in voltage rating with no issue, so somebody found this strange 58 volt rated fuse and put it in your vessel. As I assume you are on a 12 volt system, a 40 amp 32 volt fuse will work just fine.

Jim
Old 04-28-2008, 12:16 PM
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Default Re: 40 amp 58 volt fuse

Its in the Littlefuse catalog 40 amps/58 volts. Its a large blade fuse.

http://www.matrix.es/docs/Chapter12B...rposeFuses.pdf

Ken
Old 04-28-2008, 04:57 PM
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Default Re: 40 amp 58 volt fuse

kchace - 4/28/2008 3:16 PM

Its in the Littlefuse catalog 40 amps/58 volts. Its a large blade fuse.

http://www.matrix.es/docs/Chapter12B...rposeFuses.pdf

Ken
If its the fuse I think he's talking about its not that one (Maxi). Its the same size as an ATO but is odd looking in that the element is visable through the top and not the side. Its the switched 12 V accessory circuit fuse same as the Verado. Its also the first one I've ever heard of blowing, maybe Glen E has heard of that particular one blowing. Methinks you have a problem if that one blew. Call Merc and find out if its a special fuse or if any 40 amp ATO will work. BTW, the DTS fuse is the 5 amp fuse.
Old 04-29-2008, 09:09 AM
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Default Re: 40 amp 58 volt fuse

Here ya go: http://www.mercurypartsexpress.com/u...v-p166122.html

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