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Do I need fuse holder?

J

JohnnyBravo

Angler
Joined
Nov 20, 2020
Messages
53
Location
Romania
Hi,
The design purpose is obvious but more than this, what's the purpose of a fuse holder (for class T or Mega fuse)?
Can I keep the fuse suspended in air? Shall I use some tape insulation and / or glue the cable with fuse on some plastic panel instead of using a fuse holder?

thanks
 
JohnnyBravo said:
Hi,
The design purpose is obvious but more than this, what's the purpose of a fuse holder (for class T or Mega fuse)?
Can I keep the fuse suspended in air? Shall I use some tape insulation and / or glue the cable with fuse on some plastic panel instead of using a fuse holder?

thanks
Click to expand...
For safety sake, buy a fuse holder.
 
Many fuse holders are 2 bolts with a plastic case.

Not difficult to reproduce if needed and you are handy.

They make it convenient to change out the fuse.

Suspending in air sounds like bad decision making. Glue sounds like really bad decision making.
 
Throw my question in here if the op is OK with it.

Good idea on the fuse holder. I was planning on just hooking up directly to my bus bar. It seems alot of the fuses are m6 bolts. What's the best process to deal with m8 lugs on the wire but m6 on the fuses?
 
matttelz said:
Throw my question in here if the op is OK with it.

Good idea on the fuse holder. I was planning on just hooking up directly to my bus bar. It seems alot of the fuses are m6 bolts. What's the best process to deal with m8 lugs on the wire but m6 on the fuses?
Click to expand...
You crimp the correct size lug on the cable.
 
If you don't use a fuse holder, the burden is on you to mechanically restrain both ends of the fuse.
You should assume it will break apart (Class T included).

I chose to bolt one end of a 300A Class T directly to a busbar. No room for a holder.
The 4/0 cable connected to the other end is strapped down hard with Adel clamps because I am paranoid.

A fuse holder is always a better and safer option.
 
You need something that can take the heat and allow the fuse whatever convection air passes over it. And provide physical support for both end before and after it blows. There is a thread here that shows a melted ANL holder, another that shows a melted class T holder, and several other types. Start in the up in smoke forum and search fuses.
 
A fuse without a holder is a booby trap.

The last thing you want in an overcurrent situation is the shorted cable to fall on something else. Likely to set off an entirely new chain of events vs. what would normally be just a blown fuse.
 
What I meant was is that there are multiple threads with fake and cheap holders. One is required in all cases but the cheap fakes are as bad as none.
 
robbob2112 said:
What I meant was is that there are multiple threads with fake and cheap holders. One is required in all cases but the cheap fakes are as bad as none.
Click to expand...
it's something I don't understand, two bolts glued on a piece of plastic (eg. the Blue Sea System fuse folder) is about $50 so, having two bolts glued or screwed on stone / tile would not be sufficient?
 
The Blue sea ones are thermoplastic verse generic ABS - higher melt point and less distortion from heat. The bolts are typically through the plastic on them. The ignition protected ones also contain any sparks in an explosive environment.

What if the force from blowing the fuse fractured the tile? There can be quite a lot of force if you watch the various videos.
 
understood, anything better in terms of price/quality ratio than this?
51Tu-MfjHkL._AC_SL1000_.jpg
 
That is the best thing on the market in the US ... in the EU you can use the NH series fuses and holders - they are large and square but about 1/3rd the price of a class T. The bare holders are fine in a ventilated environment. If you want an enclosed holder there are a variety of them available.

The brand Mersen is common in Germany and that area, so I would assume available to you. Siemens is another good brand out of the UK.

MERSEN | NH fuses and fusegear

Mersen is a leader in the protection of DIN systems. The offering encompasses a complete range of NH Switch Fuse Disconnectors and any class of NH power fuses: gG, aM, gTr. These devices are to be installed by authorized people. More information on Electrical Power website.
www.mersen.com www.mersen.com

You want the gG style of them.
 
Okey dokey - most folks in the EU baulk at the price of the class T.

The NH fuse are bulkier and heavoer duty looking, but inside they are the same sort of sand and fuse strips.
 
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