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Fusible Links in lieu of ANL protectors

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rockitdoc

Joined: 30 Mar 2021
Posts: 6
Location: FORT COLLINS

Posted: Tue Nov 22, 2022 3:25 pm Post subject: Fusible Links in lieu of ANL protectors

I am building an RV14A.  I planned on using ANL current limiters for the two alternators (60A PP and 40AB&C), but have since learned of these fusible link thingys.  I would prefer not to drill more holes in my firewall to mount the ANLs an fusible links would foot the bill nicely.  That is, if they provide the services necessary to protect stuff.



If they do, where can one obtain, or how does one fabricate relatively largish fusible links?  B&C supplies a 20-24ga link kit which nI have, but what about links much larger?



Thanks, in advance, as usual.



Scott

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_________________
RV14A
Began 7-23-20
Fuse and tail Completed 2-20-21
Wings 99%
Finish 90%
Engine 99%
Wiring in Process

Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Tue Nov 22, 2022 4:36 pm Post subject: Fusible Links in lieu of ANL protectors

On 11/22/2022 5:25 PM, rockitdoc wrote:

 	  Quote: 	
		   



 I am building an RV14A.  I planned on using ANL current limiters for the two alternators (60A PP and 40AB&C), but have since learned of these fusible link thingys.  I would prefer not to drill more holes in my firewall to mount the ANLs an fusible links would foot the bill nicely.  That is, if they provide the services necessary to protect stuff.



 If they do, where can one obtain, or how does one fabricate relatively largish fusible links?  B&C supplies a 20-24ga link kit which nI have, but what about links much larger?



 Thanks, in advance, as usual.



 Scott



 --------

 RV14A

 Began 7-23-20

 Fuse and tail Completed 2-20-21

 Wings 99%

 Finish 90%

 Engine 99%

 Wiring in Process



Historically, they've been pretty common in automotive environments, so 
	


they're easy to get.

8 gauge B lead?

https://www.google.com/search?q=12+gauge+fusible+link&rlz=1C1CHBF_enUS843US843&oq=12+gauge+fusible+link&aqs=chrome..69i57.5702j0j7&sourceid=chrome&ie=UTF-8



Big 6 gauge B lead?

https://www.google.com/search?q=10+gauge+fusible+link&rlz=1C1CHBF_enUS843US843&oq=10+gauge+fusible+link&aqs=chrome..69i57.4102j0j7&sourceid=chrome&ie=UTF-8



You can solder, or use bare copper crimps, & heat-shrink for insulation, 

or (at least for the smaller lead) you can probably find a Fast-on crimp 

that's big enough. The purpose-built link wire has its own flame-proof 

insulation to contain the heat long enough for the link to open.



I like them because not only do they reduce the hardware to be mounted, 

they also greatly reduce the number of terminations/connectors in the 

circuit.



Charlie



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Charlie

Eric Page

Joined: 15 Feb 2017
Posts: 245

Posted: Tue Nov 22, 2022 5:40 pm Post subject: Re: Fusible Links in lieu of ANL protectors

For wrapping your fusible links, search eBay for "silicone fiberglass sleeve".  It's similar to fire sleeve, but available in thin-wall versions and small diameters.

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Nov 22, 2022 6:46 pm Post subject: Fusible Links in lieu of ANL protectors

At 05:25 PM 11/22/2022, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rockitdoc" <scott.shuler(at)colostate.edu>



 I am building an RV14A.  I planned on using ANL current limiters for the two alternators (60A PP and 40AB&C), but have since learned of these fusible link thingys.  I would prefer not to drill more holes in my firewall to mount the ANLs an fusible links would foot the bill nicely.  That is, if they provide the services necessary to protect stuff. 	


   Fusible links are the way to go. Just splice them onto the

   risk-source end of your protected feeder.



   For the big alternator, I suggest an 8AWG (or larger)

   feeder with this fusible link.



  https://tinyurl.com/2md9xov3



   For the little alternator build a 10AWG feeder (or larger)

   with this fusible link.



  https://tinyurl.com/2mek723r



   These are just a few options. You can buy

   BULK fusible link wire but you wind up with

   a extra wire you will probably

   never need. Buying automotive pre-fab

   links is a lot less fussy and nothing

   to inventory.



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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rockitdoc

Joined: 30 Mar 2021
Posts: 6
Location: FORT COLLINS

Posted: Wed Nov 23, 2022 5:12 am Post subject: Re: Fusible Links in lieu of ANL protectors

 	  nuckolls.bob(at)aeroelect wrote: 	
		  At 05:25 PM 11/22/2022, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rockitdoc" <scott>



 I am building an RV14A.  I planned on using ANL current limiters for the two alternators (60A PP and 40AB&C), but have since learned of these fusible link thingys.  I would prefer not to drill more holes in my firewall to mount the ANLs an fusible links would foot the bill nicely.  That is, if they provide the services necessary to protect stuff. 	


   Fusible links are the way to go. Just splice them onto the

   risk-source end of your protected feeder.



   For the big alternator, I suggest an 8AWG (or larger)

   feeder with this fusible link.



  https://tinyurl.com/2md9xov3



   For the little alternator build a 10AWG feeder (or larger)

   with this fusible link.



  https://tinyurl.com/2mek723r



   These are just a few options. You can buy

   BULK fusible link wire but you wind up with

   a extra wire you will probably

   never need. Buying automotive pre-fab

   links is a lot less fussy and nothing

   to inventory.



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?" 	




Thanks, Bob.



Do I need to protect the fusible link with a fire sleeve, or do the ready-made versions come with protection?  And, for that matter, does the bulk fusible link wire come with protection?



Scott

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
RV14A
Began 7-23-20
Fuse and tail Completed 2-20-21
Wings 99%
Finish 90%
Engine 99%
Wiring in Process

rockitdoc

Joined: 30 Mar 2021
Posts: 6
Location: FORT COLLINS

Posted: Wed Nov 23, 2022 5:47 am Post subject: Re: Fusible Links in lieu of ANL protectors

 	  nuckolls.bob(at)aeroelect wrote: 	
		  At 05:25 PM 11/22/2022, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rockitdoc" <scott>



 I am building an RV14A.  I planned on using ANL current limiters for the two alternators (60A PP and 40AB&C), but have since learned of these fusible link thingys.  I would prefer not to drill more holes in my firewall to mount the ANLs an fusible links would foot the bill nicely.  That is, if they provide the services necessary to protect stuff. 	


   Fusible links are the way to go. Just splice them onto the

   risk-source end of your protected feeder.



   For the big alternator, I suggest an 8AWG (or larger)

   feeder with this fusible link.



  https://tinyurl.com/2md9xov3



   For the little alternator build a 10AWG feeder (or larger)

   with this fusible link.



  https://tinyurl.com/2mek723r



   These are just a few options. You can buy

   BULK fusible link wire but you wind up with

   a extra wire you will probably

   never need. Buying automotive pre-fab

   links is a lot less fussy and nothing

   to inventory.



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?" 	




Thanks, Bob.



Do I need to protect the fusible link with a fire sleeve, or do the ready-made versions come with protection?  And, for that matter, does the bulk fusible link wire come with protection?



Scott

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
RV14A
Began 7-23-20
Fuse and tail Completed 2-20-21
Wings 99%
Finish 90%
Engine 99%
Wiring in Process

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