Hi think I'm getting PTSD We all know what a fuse is. It's a piece of wire that melts open under high current and let's not get bared. And when it open, when it burns, it cuts your circuit open, stopping the flow of high current and protects your circuit against fire and such. And every one of them has a different current rating depending on how much current your circuit normally needs and at what level you want them to blow open and protect your circuit.

So these are short circuits with close to zero volts across them. Then why the hell do they have voltage ratings like this is rated for 250 volts. It's still a short circuit. It's not like if I place it on a circuit with a 2,000 volt Supply there will be 2,000 volts across this.

In fact, let's try it with my my high voltage. Transformer These Transformers are very dangerous and one of them has killed me once before and we don't want that to happen to anyone else so don't Here is a 10 Ohm resistor as my circuit series with the fuse connected to the 2,000 volt transformer and so the fuse blows open quickly, protecting my circuit like this. Oh sh ah look at this. even the glass cracked and broke under extreme heat.

The voltage rating is not about the normal operating mode, it's for when the fuse breaks open and we want it to reliably open. We know a strong high voltage can jump the Gap creating an arc, keeping the circuit closed like we saw. So in order to make sure a fuse or breaker actually opens, it needs to be made differently. Otherwise, the arcs never die and that's not safe.

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So we need to make our fuse wire longer. We put two Nails on a cardboard box. We put some very thin wire around the nails and we turn it on. Oh oh fire.

Oh oh sh no No no no no. In case of electric fire, never try to pull it out with water. It creates shorts and can cause electrocution. Always try to cut electricity first.

If possible, then use non-conductive fire extinguishers made for this purpose. I Guess this is why they use some sort of cover or glass for the fuse so the molten metal and arcs don't start a fire. I Have a plastic bottle. let's try this one.

We just put the nails and the wires inside the cup. Here's my fuse. let's try it out. Here we are and we turn it on.

Oh sh well. it took a while but it opened and the fire was contained in here. So safer. What if we vacuum in here so that there is no ionized air to help create arcs here? I'm holding my super thin piece of wire here.

put it inside our vacuum chamber, connect the vacuum pump. now. hopefully there is some good amount of vacuum and we turn the power on. Oh my God did you see that? Look at this nonsense.

Oh my God that was a failure. It's easier to create much longer Ox with much lower voltage in vacuum. I Suspected that, but not that much. It's interesting because under normal atmospheric pressures, the 2,000 volts can only start jumping under 1 mm.

Gap But as we saw, it jumps well over 10 cm in partial vacuum. This new Transformer seems to be a little bit weaker than the old one I had which I broke I should get a stronger Transformer Me: Not you? Okay, you don't need to acquire anything that has a resemblance to this. Of course, after it starts, it can extend to a longer distance if the source is powerful enough. I suppose instead of a vacuum, you could replace the air inside the fuse container with some non-conductive noble gas like Argon.

Would that work? I don't have Argon. so I'm thinking if I can make it happen reliably in air, it would be good. like here: I'm taking a very long thin wire if you can see it so that hopefully it can fall away quick stopping the arc. It did work I think I'm on to something.

Maybe I can make it even quicker. Okay, here me out. I'm running a very thin fuse wire between these two nails and I have two elastic bands that are pulling this wire apart, keeping it at a tension in the middle. So when the fuse blows open, these elastic bands will pull the wires apart quickly and hopefully extinguish the arc as soon as possible.

The fuse is shorting the 2,000 volts and now we shall turn it on. Look, this is exactly how you expect a fuse to behave. Unlike the last time that the entire wire just evaporated, this time, it just broke straight in the middle. The rest of the wire is intact, and there was no huge arcs either.

Awesome! So any mechanism that quickly breaks and pulls wires apart should be very good for high voltage. In fact, the microwave oven that I pulled the Transformer out of has its own fuse. Where did I put it? I put my oven parts in my cookie box. Where is the fuse? Oh there it is.

Here's the fuse. It Looks interesting. Well protected in a plastic. Is it a box? can I open it? Oh, look at it.

There is a more regular looking fuse inside the plastic cover. It is a 5,000 volt 0.7 amps fuse from my extensive experience with high voltage fuses. Oh, the Gap doesn't look far enough to avoid big arcs. Let's try it out.

but this is interesting. See the fuse wire on one side is a spring pulled open, keeping the fuse wire under tension. So when the fuse breaks open, the spring pulls the contacts apart, eliminating the arc like what I did with my elastic bands. Okay, the fuse now is shorting the 2,000 volt output.

Let's see if it works as advertised. Well, I mean the fuse wire is completely eradicated, including the spring and everything was there. A point to the spring, but it's interesting for such a small. Gap There was almost no Arc Is there a special gas in there? I Can't find anywhere if there is a special gas in these glass tube fuses.

Somebody let me know. But in conclusion, that's why every fuse has a voltage rating. Use it outside the rated voltage and there will be death and destruction. So mind the ratings or else on.