What exactly is the difference between a surge protector and a fuse? Can a fuse protect the electronic devices from lightning instead of surge protector?

For this case there are devices called Metal oxide varistors (MOV).

Can the fuse protect the electronic devices from lightning instead of a surge protector.

(Dc diagram shown, AC is similar).

Hello, I have a question about astral projection. I started to get interested in this a little while after my mum passed in april. I thought I may be able to see her and speak with her if I managed to achieve astral projection. Since this interest, every time i sleep on my back I go into sleep paralysis. However, I cant progress into astral projection because it is very scary for me as I feel like I'm suffocating when this happens. I panic and force myself to wake up. This only ever happened about once a year before this. It sometimes lasts a long time. This has happened about 3 times per week since my mum died, as mentioned on a previous post. I no longer try to go into it anymore(due to the suffocating feeling), but it still happens. I read that sleep paralysis is the pathway to astral projection. Why has this started to happen so frequently since simply taking an interest in it? Is this connected to the afterlife? I am concerned about it as I now cannot seem to stop this happening. Could it be my mum trying to communicate? Im asking due to more knowledge around this in this group.

And this is the problem alone. Is the power supply in the equipmemt designed with a lightning strike in mind? Some yes, others, no.

This is where the MOV conducts again, and dissipated the energy.

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This is 'the assistant's answer'

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A fuse is a non-resetable over current circuit protector.

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(There is no concept of polarity, in the loop because the current changes direction 100 to 120 times a second (power frequency).

but I think this circuit , shows a few more pieces.

When the current is 200% of the rated value , it will “go open” (the link metal melts) and protect the device.

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Lightning arrestor is a spark-gap device, and can be installed anywhere. What is important, is that the wire is thick enough to withstand the lightning bolt and conduct the energy away from the building.

So, it’s possible that these devices from Trip Lite have addition suppression devices, these ones seem to be sturdy.

2024–09–27 [ Mohan Rajaratnam Mohan Rajaratnam ] . Thinks you can get free electricity from nothing : Mohan Rajaratnam's answer to Is it possible to generate free electricity at home using a magnet or other low-cost methods? If so, how does it work?

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2024–10–11 [Victor Olarewsju Victor Olarewaju ]

The bolt then partially travels down the line to your home.

There is no harm in having the surge suppressor along with the fuse in the circuit. The fuse will not open up until the current melts the link. This will take time, and in the interim, that jolt will get transmitted into the power supplies.

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The third is lightning and “how it gets conducted into a home.”

These are simplified answers to the original question, and does not change anything I wrote above.

What is lightning?

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so, the loop of wire then, when put together with another loop reduces the ‘noise’ on a power line.

The other is “what does a “fuse” do?”

Fuses, on their own, then operate much slower than the MOV variable resistance, during the lightning strike.

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Is the question then , "why buy a surge supressor, if the fuse alone protects the electronic circuits from a lightning bolt?".

2024–10–14 [Omar Gharbi Omar Gharbi ]

There are two important concepts here.

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P = e* I, so since I is 16 amps, then the voltage dropped is 1/16 volt or 0.0650 volts.

He then describes the function of a fuse.

so, what happens?

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He then describes Rainy Season and Lightning.

“ … to protect building, lightning arrestor, is provided above building and directly connected to earth.”

There are three different concepts here that are getting confused.

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These devices are installed between the “hot” and “neutral” and protective ground.

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what exactly is a ‘surge’ protector?

One

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Here is a simplified AC power diagram.

It also is a device that limits the change in current flow.

A circuit breaker is similar, but is resettable.

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“ A surge suppressor is the one which is connected at the input supply so that when there is a sudden change voltage it bypasses thereby protecting the (circuit) and electronic components”

This is the picture of an electronic coil of wire wound around a core of magnetic material.

If the nominal power is 4,000 watts then the current at 230volts is 16 amps.

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It seems Mohan does not understand the difference between a comment and an Answer.

At least they know the answer if they wanted it.

But it can get overloaded, and no longer works.

OK, this is Mohan Rajaratnam’s definition of a Surge suppressor.

An AC voltage/ current source, and an ac inductive load.

What does a fuse do?

but this device (an Inductor) … impedes the rapid changes in the current.

At the secondary, it is 1000 times less.)turns ratio). If it gets hit with a 100,000 volt bolt of lightning then the voltage arrestors conduct and clamp the voltage down to line voltage, ( but a small amount leaks down the line). This is the problem.

This one hit behind the barn.

Now when you have a certain ac resistance, then a current flows in a loop.

But during the surge, the fuse will not blow if it is a longer duration and lower value )10 to 50%).

So, the voltage could go up to 500 volts, and the fuse will not open up.

So combined with a device called a MOV or Metal-oxide-resistor, then forms the 3rd part of a “surge suppressor “.

This is where this question deviates from being a 'generic' question, and becomes more specific.

But… the neutral is now “floating” because of the 1 ohm resistance.

a photo is worth a thousand words.

This is an electronic circuit designed to clamp voltages so that the Voltage Potential that appears at the outlet is never going to exceed the nominal value.

Once the voltage goes over 0.0650 volts, then this fact can be used to amplify the difference, and turn the circuit breaker off , furthur down the line. Essentially that is what a RCD/GFCI does, it compares the incoming current, to the outgoing current, and if the difference between the two currents is over 5mA, then it trips the circuit breaker.

At one ohm, the resistor has a maximum of 1 watt power.

Edit 2024–10.

This device then solves the entire problem.

2024–10–16 [ OO OLAOYE OYEBODE ]

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It’s been three xxx five werks, and there has been no response to my follow on query on his Commment to my answer.

2024–10–00 [ Ammar Mahdi ] Ammar Mahdi

2024–10–10[John johnson John Johnson ]

the problem then depends on "how fast does the fuse operate?".

2024–10–11 [Bobby Sanchez Bobby Sanchez ].

This is a photo where a lightning bolt took out a home's complete mains distribution box, and a lot of electronic gear as well.

In schematic diagrams this is the symbol for a fuse:

The MOV will conduct when the voltage exceeds 50% of line voltage.

Because the load is inductive, the current lags the voltage.(by a bit).

He then asserts :

[image of Common-mode choke]

Would individual surge supressors have save this equipment? most likely, since the surge supressor would take the jolt instead of the electronic components.

“ A fuse is a device which protects the (circuit) against overload and short circuit.”

This is a high voltage low current spike that comes down the line because of the power poles being struck, and the voltage suppressors activating on the primary side of the transformer.

Mohan forgets that a fuse is a one-time device, and needs to be replaced if it is tripped.

[old diagram got deleted by accident]

One is “what exactly is in a ‘surge protector’ ? ”