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post #1 of 13 Old 04-10-2019 Thread Starter
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Question Cube Fuse on a Distribution Bar

Looking at the MRBF fuses available I'm trying to understand why a fuse block is used instead of simply mounting it directly on the power distribution bar. An insulating shoulder washer would be needed, of course, but how would it be any different than using the stud on the block?
I also wonder at the price spread. Less than $9 to more than $18 for brand name fuses.
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Re: Cube Fuse on a Distribution Bar

Are you talking about these: https://www.westmarine.com/buy/blue-...09_273_007_517

If so, they are common.

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Re: Cube Fuse on a Distribution Bar

Yes, that's them. My question is why would you need to use the block:
https://www.bluesea.com/products/519...k_-_30_to_300A
Couldn't you save money and space just putting them onto the bus bar, or even bolted down to the battery terminal without the fuse block?
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Re: Cube Fuse on a Distribution Bar

The stud is isolated from the base. Otherwise the blown fuse would not break the circuit.
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Re: Cube Fuse on a Distribution Bar

Are you asking whether you can put the fuse at the positive distribution bus, rather than on the battery itself? If so, I understand the fuse must be less than a max distance (inches) from the battery and the bus is likely far beyond that. Not to mention, some banks have other systems, such as bilge pumps, that by-pass the bus and are wired directly to the bank.
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Re: Cube Fuse on a Distribution Bar

I'm thinking of using the cube fuses on the +ve bus as branch fuses for the various fused wires such as the alternator, starter, solar, bilge pump etc. The battery would still be fused at the post but I still don't understand the need for the extra fuse block. If you insulate it properly it would still fuse the circuit.

Cube Fuse on a Distribution Bar-positive-battery-terminal-clamp-ceramic-cube-fuse-vehicles-boats%5B1%5D.jpg

This picture is what started my thoughts. Imagine the stud as a stud on the positive bus bar. Why would you need the extra fuse block?
It adds connections that I don't see as doing anything.
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Re: Cube Fuse on a Distribution Bar

Quote:
Originally Posted by nramsey View Post
...This picture is what started my thoughts. Imagine the stud as a stud on the positive bus bar. Why would you need the extra fuse block?
It adds connections that I don't see as doing anything.
That setup in the pic looks wrong. Nothing is actually being fused. The cable is still in contact directly with the stud. Those cube fuses need to have a standoff that the cable is connected to. I may not be following the question.


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Re: Cube Fuse on a Distribution Bar

I don't think so. The nylon shoulder washer will keep the cable from contacting the stud.
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Re: Cube Fuse on a Distribution Bar

Perhaps a picture will help. There is no continuity between the base and the stud. In other words there is an open circuit between the two probes.
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Re: Cube Fuse on a Distribution Bar

I understand that, but the insulator on top does the same job. The stud is not connected directly to the cable. The current must go through the fuse. Just "upside down" but with the same result.
Insulating the stud from the base is more difficult than insulating the cable from the stud but I can't see any difference in the result.
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