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Old 29-01-2016, 12:05   #1
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Join Date: Dec 2014
Location: the Med
Boat: Nauta 54' by Scott Kaufman/S&S - 1989
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The Marvel of the AIC FUSES

That's a MUST I admittedly never heard of before. I was told that B. installs them as OEM... kudos.

I hope some but I (STU, MAIN SAIL, GOD..) May gel+ me in designing a decent, care-free system, as I don't trust has-dropping electricians all around any leisure dock here (Med).

I attach what I sent to a German dealer of Littlefuse Inc. - USA

" Sirs, in installing the electric system on a boat under refit, I need your technical advice, about choosing the correct Intercept Current Fuses, from Littlefuse, or similar.
Engine bank: 2x200Ah LA batteries, cranking on a Volvo TAMD 31-LA 3Lt. Diesel engine
Power alternator Bosch 150A
2 house banks (services) each made of 2x140Ah Yuasa 12V batteries (total = 4 batteries)
They are charged separately by 2 chargers (230V 60A and 45A) but used as a single bank when not under charge.

1500W windlass and 5300W bow-thrust and nr.3 electric winches depend on the Engine bank.

I do realize that IC fuses are a must to prevent shorts, and the relevant (scaring!) damages that High DC can generate. Each battery has cold crank 815A..

I make confusion between nominal fuse Amp, and the AIC, which is rated by the thousands (up to 20,000A DC) but isn't it safer to have say 1000A on a 815A battery which, in SERVICE USE, is designed to deliver approx. 5-10% of rated nominal Amp? (I.e. 7-14A each).

Sorry guys, I'm just a mechanical eng. ... :-)

"
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Old 29-01-2016, 12:40   #2
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Re: The Marvel of the AIC FUSES

More correctly, company name is LITTELFUSE INC.

AIC stands for Ampere Interrupt Current (?)

Yes, I read this too...
http://www.pbase.com/mainecruising/battery_fusing
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Old 31-01-2016, 23:48   #3
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Re: The Marvel of the AIC FUSES

the Blue sea MRBF and ANL fuses meet the AIC rating, and come in many amps sizes... there are probably a few other ones that meet this as well.


either a fuse meets the AIC rating or it doesn't.


just put a large ANL or MRBF fuse after the battery and then drop down to all the smaller normal breakers / fuses as needed.
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