I am leaning toward using panel mounted fuses for my 701 build based on simplicity, weight, and cost but all the holders require a D shaped mounting hole and the tools I can find to make said holes cost so much it all but negates the cost savings over using breakers.   Any ideas? 



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Can you clarify which fuse holders you are looking at? I've spent a lot of time in the recent past researching this particular subject but I can't recall any kind of panel mount fuse holder that is "D shaped"?

Can you share a link or model number for what you are looking at?

Why not just use a block panel that holds multiple fuses?  Rather than cutting holes for each fuse, you could just mount the fuse panel with a few screws and likely be able to hide a grommeted hole behind the panel for the wires to pass through.  They're available in an almost infinite number of sizes and number of fuses they hold.  If you wanted it flush with the instrument panel, likely you could find one that flush-mounts from the rear through a rectangular cut-out.  

Here's one Aircraft Spruce sells:



In this picture you can see panel mounted fuseblock that requires one rectangular hole.

Ken, is the fuse panel used in your pic the same one John highlighted from ACS? 

Very nice panel!


Thanks Don. Here's a link to the Cooper Bussman fuse blocks:


Note that they are available in different sizes, and can be configured for single, double or triple bus. Also note they require the Delphi Packard Pac-Con terminals.

Ken, great info, I assume the dual power feed is so you could wire several circuits direct to the battery...sort of essential buss??

Yes. If you want an essential bus, avionics bus, etc. this fuseblock makes it convenient.

Hi Jim,  You might try something like what was shown in this video: 


Not quite the same as your situation, but I think the method could be adapted for your fuse holder, hope you don't have too many to do.

Good Luck!


This is the only type I can find http://www.aircraftspruce.com/catalog/elpages/fuseholders.php?click... and they require a 1/2" diameter D punch or a file-like tool called called a 'broach" and either one will cost over $200.

Yes I saw those but I’m trying to avoid cutting a large hole in the area I want to install them.  I just like the look of individual components in a tidy row.  

Thanks Clint I thought about all that tedious file work and that may be my only recourse other than moving to breakers. 

could you drill a row of 1/2" holes and then rivet a flat strip on the back side of the panel to mate with the flat portion of the fuse-holder ?

Clever idea Russell.  Let me ponder this suggestion.

Thanks for the picture Ken. I wonder if a small fuse block could be mounted somewhere other than in the panel.

Jim if you look on mouser or digikey you should be able to find those fuse holders that require a round hole


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