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: 28.06.2025 01:42

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.
Now when you have a certain ac resistance, then a current flows in a loop.
Edit 2024–10.
what exactly is a ‘surge’ protector?
At one ohm, the resistor has a maximum of 1 watt power.
2024–10–16 [ OO OLAOYE OYEBODE ]
These are simplified answers to the original question, and does not change anything I wrote above.
“ … to protect building, lightning arrestor, is provided above building and directly connected to earth.”
I post the exact comment here.
Kidney disease: 5 symptoms women should be careful about - Times of India
A fuse is a non-resetable over current circuit protector.
There are two important concepts here.
Upvotes:
GM has another affordable EV in the works and it’s not the next-gen Chevy Bolt - Electrek
So, the voltage could go up to 500 volts, and the fuse will not open up.
This is the picture of an electronic coil of wire wound around a core of magnetic material.
In schematic diagrams this is the symbol for a fuse:
Why would an older small breed dog become obsessive about hygiene?
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.
2024–10–14 [Omar Gharbi Omar Gharbi ]
but this device (an Inductor) … impedes the rapid changes in the current.
Cyberpunk 2077 Patch 2.3 Delayed Beyond This Week, Confirms 'Similar Scope' to 2.2 - Push Square
so, what happens?
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.
2024–10–10[John johnson John Johnson ]
There are three different concepts here that are getting confused.
This device then solves the entire problem.
But it can get overloaded, and no longer works.
Why do some films seem to date/age so badly?
If the nominal power is 4,000 watts then the current at 230volts is 16 amps.
An AC voltage/ current source, and an ac inductive load.
2024–10–11 [Victor Olarewsju Victor Olarewaju ]
Lipari Foods Issues Allergy Alert on Undeclared Milk in "Dark Chocolate Nonpareils" - fda.gov
The MOV will conduct when the voltage exceeds 50% of line voltage.
Barnstars:
(Dc diagram shown, AC is similar).
Can people who have never met you tell if you are a covert narcissist?
So, it’s possible that these devices from Trip Lite have addition suppression devices, these ones seem to be sturdy.
It also is a device that limits the change in current flow.
eight
401(k) Stats Suggest Americans Still Confident - Newser
What does a fuse do?
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.
The third is lightning and “how it gets conducted into a home.”
What was your first trans experience like?
The bolt then partially travels down the line to your home.
Fuses, on their own, then operate much slower than the MOV variable resistance, during the lightning strike.
The other is “what does a “fuse” do?”
What are some good suggestions for books? I'm into romance, fantasy and Romantasy.
nine
But… the neutral is now “floating” because of the 1 ohm resistance.
[image of Common-mode choke]
At least they know the answer if they wanted it.
These devices are installed between the “hot” and “neutral” and protective ground.
This is where this question deviates from being a 'generic' question, and becomes more specific.
“ 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”
A circuit breaker is similar, but is resettable.
OK, this is Mohan Rajaratnam’s definition of a Surge suppressor.
the problem then depends on "how fast does the fuse operate?".
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?
a photo is worth a thousand words.
He then asserts :
First Sentence:
Here is a simplified AC power diagram.
Would individual surge supressors have save this equipment? most likely, since the surge supressor would take the jolt instead of the electronic components.
So combined with a device called a MOV or Metal-oxide-resistor, then forms the 3rd part of a “surge suppressor “.
But during the surge, the fuse will not blow if it is a longer duration and lower value )10 to 50%).
(There is no concept of polarity, in the loop because the current changes direction 100 to 120 times a second (power frequency).
so, the loop of wire then, when put together with another loop reduces the ‘noise’ on a power line.
“ A fuse is a device which protects the (circuit) against overload and short circuit.”
Is the question then , "why buy a surge supressor, if the fuse alone protects the electronic circuits from a lightning bolt?".
And this is the problem alone. Is the power supply in the equipmemt designed with a lightning strike in mind? Some yes, others, no.
He then describes Rainy Season and Lightning.
One is “what exactly is in a ‘surge protector’ ? ”
Mohan forgets that a fuse is a one-time device, and needs to be replaced if it is tripped.
When the current is 200% of the rated value , it will “go open” (the link metal melts) and protect the device.
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.
This is 'the assistant's answer'
This one hit behind the barn.
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.
One
What is lightning?
Can the fuse protect the electronic devices from lightning instead of a surge protector.
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.
2024–10–00 [ Ammar Mahdi ] Ammar Mahdi
but I think this circuit , shows a few more pieces.
[old diagram got deleted by accident]
P = e* I, so since I is 16 amps, then the voltage dropped is 1/16 volt or 0.0650 volts.
It seems Mohan does not understand the difference between a comment and an Answer.
He then describes the function of a fuse.
This is where the MOV conducts again, and dissipated the energy.
It’s been three xxx five werks, and there has been no response to my follow on query on his Commment to my answer.
Because the load is inductive, the current lags the voltage.(by a bit).
2024–10–11 [Bobby Sanchez Bobby Sanchez ].
For this case there are devices called Metal oxide varistors (MOV).