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Old 11-22-2022, 05:44 PM
rockitdoc's Avatar
rockitdoc rockitdoc is offline
Join Date: May 2020
Location: Fort Collins, CO
Posts: 813
Default Fusible Link in lieu of ANL current limiter?

I was planning on 60a and a 40a ANL current limiters for my 60a Plane Power main alternator and 40a B&C backup alternators, respectively. But, I have learned of these fusible link doodads that seem very much easier to install with fewer connections. Also, with fewer holes to drill in the firewall to mount them. they do what the ANLs do? For.....Against?
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Old 11-23-2022, 08:23 AM
Mich48041 Mich48041 is offline
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Location: Riley TWP MI
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Haven't used fusible links personally. But on the AeroElectric-List, Bob N and Charlie E recommend them.
I have the utmost respect for both of their opinions.
Joe Gores
RV-12 Flying
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Old 11-23-2022, 08:46 AM
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Bruce Bruce is offline
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It will not replace the 60 or 40 ANL
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Old 11-23-2022, 09:04 AM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest, USA
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Default My opinion

Just my opinion, but I think fusible links are fine for low ampere stuff like 5 amps and below in airplanes. But when you start talking about 20, 40, and 60 amps, I think fusible links should no be used and the ANL style is best.

When a fusible link blows, it is with a lot of fire, sparks, smoke, and stuff. It could damage other wires nearby or light on fire other things. The higher the current, the bigger the implosion. For small currents, like 5 amps, the event seems pretty mild so is probably ok forward of the firewall.

Fuses, and ANL fuses with proper holders, contain all this fire sparks and stuff, so do not allow the event to cause problems with other nearby circuits.

I used only two fusible links in my build; both of 30 awg to supply unfused power to my LED strip for the baggage light.

By the way, the fusing current for 16awg wire is something like 120 amps ( dont quote me on that). And is very dependent on the environment and thermal dissipation, etc
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

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Last edited by PilotjohnS : 11-23-2022 at 09:11 AM.
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Old 11-23-2022, 09:10 AM
blaplante blaplante is offline
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Default Fusing Current Tables
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Old 11-23-2022, 10:24 AM
Mikeyb Mikeyb is offline
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Location: Pasadena ca
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An alternative to ANL fuses are MRBF terminal fuses. They eliminate several connections in the typical RV alternator/main bus connection. . The fuses are standard Bussman fuses. They are the little plastic squares in the picture.
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