Functional difference between JLLN and ANL type fuses

[mikestock]

I may have accidentally, unknowingly, touched my positive lead to ground at my inverter and it blew the main 300 amp Type T, JLLN fuse. Until I'm sure this was a one time thing and no problem exists, I want to temporarily replace it with a cheaper ANL type fuse.

ANL type fuses are $2 or $3 and the JLLN sells for $30 and up. Before I put another expensive JLLN type T, I would like to temporarily use the cheaper fuse to trouble shoot.

I know they differ in appearance, but could someone explain the functional difference between the two type fuses?

[mikestock]

This is weird to the point of not wanting to believe it.

It's either true or mister Simpson and mister Fluke are messing with me.

Must have some kind of diode in each direction in line with separate fuses. Could be something about the fuse, to allow charging in one direction and output to inverter in the other.:h:?

With the fuse replaced with a jumper everything is working.

[PaulJ2]

If it acts like a diode maybe it is in fact a diode. Could be there to protect the converter from reverse polarity. Is it a converter or in fact an inverter?
Guess i'm confused.

[road-runner]

mikestock wrote:
One thing that is interesting: After removing the bad fuse I checked it again. It acts like a diode. I get continuity in one direction but not in the other. Never seen any fuse like this.

This is weird to the point of not wanting to believe it.

[mikestock]

One thing that is interesting: After removing the bad fuse I checked it again. It acts like a diode. I get continuity in one direction but not in the other. Never seen any fuse like this. Can anyone explain? I replaced the fuse with a jumper just to get my psw inverter install completed and checked out. Should have proper replacement in a couple of days.

This is definitely not a common item. Called five electrical supply houses locally and none of them had and access to acquire it.

[mikestock]

time2roll wrote:
Class T has higher voltage and ampere interrupt rating.
Not really an issue with a 12v inverter.

www.bestconverter.com/Class-T-Replacement-Fuse $17

Probably even less on amazon

Thanks, With USPS shipping, that looks like the best price I've seen.

[time2roll]

Class T has higher voltage and ampere interrupt rating.
Not really an issue with a 12v inverter.

www.bestconverter.com/Class-T-Replacement-Fuse $17

Probably even less on amazon

[mikestock]

So, my plan to use the cheaper fuse temporarily while making sure there is not a hidden problem that will blow the, much more expensive, type T, 300 amp??

[RLS7201]

JLLN fuses are rated for 300 volts.
ANL/CNL fuses are rated for 32 volts.
Both are fast acting. I don't see an issue with either one on a 12 volt DC system.

Richard

[darsben1]

JllN has a fast response time to protect the circuits