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Dania
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Join Date: May 2019
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12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 7:41 AM

Lately I have come across a 12V automotive fuse box. I have noticed that a plain washer is placed between the top surface of the over-molded stud and the bottom of the fuse (Midi/Mega) terminal. On top of the fuse terminal comes the eyelet tightened with a nut.

Another video from the "wiring products" channel shows the following configuration Fuse holder with Over molded stud >> Plain washer >> Terminal eyelet >> Plain washer >> Fuse (ANL) terminal >> Spring washer >> Nut

I have heard that the washer is placed between the fuse terminal and the nut to increase the bearing surface and minimize the fuse terminal's turn while tightening the nut due to friction.

But what is the significance of adding the washer under the fuse terminal when the over-molded bolt shoulder diameter and the washer diameter are the same?

Thank you!!
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SolarEagle
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#1

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 7:59 AM

Keeps the fuse connection from imbedding in the plastic for one thing, but also increases the surface area of contact to minimize heating of the contact area....

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Dania
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#2
In reply to #1

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 9:20 AM

Thank you!

Is there any standard that defines the minimum gap between to be kept between fuse connection and plastic? there are many fuses ranging from 30A to 350A all of them have the same gap!
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PWSlack
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#3
In reply to #2

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 9:49 AM

<...standard...>

In which country?

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Dania
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#4
In reply to #3

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 10:02 AM

Germany OEM and US OEM

12V application, for global market..
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PWSlack
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#5
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Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 10:48 AM

It's worth a couple of phone calls to those <...OEM...> organisations to find out. They are, of course, in different time zones.

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Dania
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#7
In reply to #5

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 11:38 AM

Thank you for the response!

German OEM has a drawing to define the minimum gap, but it's not fuse (Load) and/or mounting location-specific rather blanket spec.

US OEM doesn't have any specification regarding the minimum gap to be kept, and it's up to the supplier. But the part has to clear the validation protocol.

I did a few internet searches to understand the rationale; I couldn't find relevant info.
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PWSlack
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#10
In reply to #7

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/24/2022 10:32 AM

Not everything is on the <...internet...>. That's why the telephone is the correct tool to use.

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SolarEagle
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#6
In reply to #4

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 11:21 AM
  • IEC-publication 257 (1968) and Amendment no. 2 to this publication dated January 1989.
  • UL-standard no. 512.
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Dania
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#8
In reply to #6

Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 11:47 AM

Thank you!
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SolarEagle
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#9
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Re: 12V Automotive Fuse box (Fuse mounting hardwares)

01/20/2022 9:52 PM

I don't think there is a minimum clearance clause, but it's more about the materials ability to withstand the heat...If you've ever seen an electrical disconnect or fused disconnect that has repeatedly been subjected to high temperature, you can see it doesn't really melt or burst into flames, but just slowly turns to carbon ash...

..."Stanyl TW200F6 and TE200F8 outperformed PPS and PPA in component evaluation: This material offers a great combination of flow and peak temperature resistance up to 290°C – delivering greater reliability and peace of mind for manufacturers."....

https://www.dsm.com/engineering-materials/en_US/industry/automotive/electronics-electrical/fuse-boxes.html

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