Fuse box devices

ziporah

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Apr 26, 2021
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Anybody got experience using these fusebox devices ? I'm on the search for some security options between my inverter and batteries. I'd love to get some circuit breakers, but I can't seem to find any decent ones. So I'm thinking of using these with 60A fuses.
My system is a 48V system, I don't plan on pulling more then 60A out of a single pack, since my BMS will cutoff the pack if this happens and while I'm at it, I want the option to expand for more packs in the future, so I was thinking of putting two of these things between the positive and negative terminals.

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I also found these devices, which claim to be 12-48V, 200A DC / 1000A crank, but I don't know if I want to believe these numbers, they sound to good to be true. Anybody care to give me some advice here ...
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A better solution might be getting fuse devices with terminal screws, so I can use cable eye terminals on my cables instead of trying to push them in the terminal block. I've got a high power compression tool, so I can easily crimp the eye terminals to the cable and the screw them to the fuses, but I don't seem to find fuses with screw terminals. They are all like this and I don't want a dangling cable when I have to replace the fuse.
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You should be able to find good DC circuit breakers at solar & boating outlets.
Yes you do need methods to safely switch off the system & isolate items like batteries, solar panels, chargers, inverters & loads so you can work on them & be protected.
Noark, Schnieder, ABB & others make DC breakers.
With a breaker you get an overlaod safety device & an isolation switch in the one unit.
 
After some digging, I stumbled on these devices. It took me some time to find them at a good price, but they seem to be up for the job.
for reference if someone tries the fuse breaker search on the forum, it's a schneider C60H-DC device, these ones will do up to 63A just fine.

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Oh Schneider are very expensive breakers, I suppose they're good quality ones.

I'd searched the products you posted, I bought the 1000A switches, maybe rating is a bit high but they should work. Didn't use them for anything yet. About the fuses, the last ones you posted seemed good quality to me, but they were too expensive. Also I only buy products which have CE mark on them to be legally compliant over here in Italy, they must have it by law.

I'll tell you something that will make you laugh (or cry!): I had a problem with the main energy meter, mounted by the biggest italian electricity company; the switch wouldn't work any more, it was blocked half way between on and off... making a frightening sizzling noise. The company's technician arrived real quick and changed it for me... and for my surprise it was one of the cheapest Aliexpress MCBs... one of those I avoided buying because it didn't meet my minimum quality standard! A 63A AC MCBs make Chint, without CE marking... wth!

After my usual long research I choose 10x38 fuses with arc-suppressor sand inside, with those nice DIN rail ready fuse holders:

TOMZN MCB and 10x38 fuse holder.jpg
These holders are rated max 32A and the fuses are 30A (my current is well below that). For your current I think you'd need the bigger sized fuses 14x51... I found a lovely and expensive Schneider for you LOL:

Schneider 14x51 fuse holder.jpg
This is the 50A version... they look so good mounted on DIN rails, and the have the blown fuse indicator.

[EDIT]
As you know MCBs and fuses are very different, a fuse would blow almost instantaneously under excessive current. An MCB could take some time (an AC MCB can take even 100 seconds before it trips under over-current, didn't check it it's the same for DC). SO I use MCBs for protection against short-circuits and to switch circuit off. And fuses to protect against over-current.
 
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I'll tell you something that will make you laugh (or cry!): I had a problem with the main energy meter, mounted by the biggest italian electricity company; the switch wouldn't work any more, it was blocked half way between on and off... making a frightening sizzling noise. The company's technician arrived real quick and changed it for me... and for my surprise it was one of the cheapest Aliexpress MCBs... one of those I avoided buying because it didn't meet my minimum quality standard! A 63A AC MCBs make Chint, without CE marking... wth!
oh boy :eek: here in Belgium all MCB's are Vynckier/Schneider.My entire breaker board is filled with only Schrack/Schneider/Vynckier and some other well known brand.
Those 32A holders are also on my list, when I'll be going to expand my system with another pack. I'll be reducing the current for each pack as soon as I get my second pack ready. Now I'm gathering the final parts to get my first 5.3kW live, goal is to build another 5.3kW and expand, reducing the current per pack to 32A instead of 60A.

MCB vs Fuse => yes I know, I'm an electronical engineer by training, so I've had all these lessons about 20 years ago. That's exactly why I've ordered 60A fuses to put between the battery pack and the inverter (in my case an APC 3kVA ups)
 
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