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?
Last Updated: 17.06.2025 00:53

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.
This is 'the assistant's answer'
The MOV will conduct when the voltage exceeds 50% of line voltage.
What is your first experience having sex with older men?
In schematic diagrams this is the symbol for a fuse:
These are simplified answers to the original question, and does not change anything I wrote above.
eight
How much should one budget to travel for 1 month generally?
For this case there are devices called Metal oxide varistors (MOV).
There are three different concepts here that are getting confused.
And this is the problem alone. Is the power supply in the equipmemt designed with a lightning strike in mind? Some yes, others, no.
Do most narcissists have good intentions as long as you are under their control?
What is lightning?
what exactly is a ‘surge’ protector?
so, the loop of wire then, when put together with another loop reduces the ‘noise’ on a power line.
But… the neutral is now “floating” because of the 1 ohm resistance.
Now when you have a certain ac resistance, then a current flows in a loop.
[old diagram got deleted by accident]
Apple's Latest Movie Trailer Innovation Suggests The Future Of Premium Home Viewing - SlashFilm
A circuit breaker is similar, but is resettable.
But it can get overloaded, and no longer works.
One is “what exactly is in a ‘surge protector’ ? ”
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.
Would individual surge supressors have save this equipment? most likely, since the surge supressor would take the jolt instead of the electronic components.
He then asserts :
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.
a photo is worth a thousand words.
What is unattractive about a nice guy? Why do some women don’t choose nice guys?
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.
This device then solves the entire problem.
Why do I sweat (mostly on face) when I eat usually spicy food?
First Sentence:
Here is a simplified AC power diagram.
2024–10–11 [Bobby Sanchez Bobby Sanchez ].
(There is no concept of polarity, in the loop because the current changes direction 100 to 120 times a second (power frequency).
At least they know the answer if they wanted it.
It also is a device that limits the change in current flow.
My son flunked his road test because he was driving a Tesla, dad says - NJ.com
(Dc diagram shown, AC is similar).
So, it’s possible that these devices from Trip Lite have addition suppression devices, these ones seem to be sturdy.
He then describes Rainy Season and Lightning.
Samsung Galaxy S25+ Powers Van Gogh Museum’s New Audio Tour - Samsung Newsroom
One
2024–10–16 [ OO OLAOYE OYEBODE ]
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.
BYU’s Lexy Lowry destroys national record, finishes 2nd in NCAA steeplechase - Deseret News
At one ohm, the resistor has a maximum of 1 watt power.
Mohan forgets that a fuse is a one-time device, and needs to be replaced if it is tripped.
[image of Common-mode choke]
If the nominal power is 4,000 watts then the current at 230volts is 16 amps.
so, what happens?
It’s been three xxx five werks, and there has been no response to my follow on query on his Commment to my answer.
Barnstars:
P = e* I, so since I is 16 amps, then the voltage dropped is 1/16 volt or 0.0650 volts.
A fuse is a non-resetable over current circuit protector.
He then describes the function of a fuse.
Is the question then , "why buy a surge supressor, if the fuse alone protects the electronic circuits from a lightning bolt?".
2024–10–10[John johnson John Johnson ]
Because the load is inductive, the current lags the voltage.(by a bit).
Fuses, on their own, then operate much slower than the MOV variable resistance, during the lightning strike.
Can the fuse protect the electronic devices from lightning instead of a surge protector.
There are two important concepts here.
The third is lightning and “how it gets conducted into a home.”
but this device (an Inductor) … impedes the rapid changes in the current.
Edit 2024–10.
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.
the problem then depends on "how fast does the fuse operate?".
This is where the MOV conducts again, and dissipated the energy.
These devices are installed between the “hot” and “neutral” and protective ground.
It seems Mohan does not understand the difference between a comment and an Answer.
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?
So, the voltage could go up to 500 volts, and the fuse will not open up.
nine
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.
The other is “what does a “fuse” do?”
This is the picture of an electronic coil of wire wound around a core of magnetic material.
Upvotes:
2024–10–14 [Omar Gharbi Omar Gharbi ]
So combined with a device called a MOV or Metal-oxide-resistor, then forms the 3rd part of a “surge suppressor “.
I post the exact comment here.
OK, this is Mohan Rajaratnam’s definition of a Surge suppressor.
“ … to protect building, lightning arrestor, is provided above building and directly connected to earth.”
An AC voltage/ current source, and an ac inductive load.
The bolt then partially travels down the line to your home.
What does a fuse do?
2024–10–00 [ Ammar Mahdi ] Ammar Mahdi
“ A fuse is a device which protects the (circuit) against overload and short circuit.”
2024–10–11 [Victor Olarewsju Victor Olarewaju ]
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.
“ 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 where this question deviates from being a 'generic' question, and becomes more specific.
But during the surge, the fuse will not blow if it is a longer duration and lower value )10 to 50%).