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: 22.06.2025 02:26

First Sentence:
Is the question then , "why buy a surge supressor, if the fuse alone protects the electronic circuits from a lightning bolt?".
P = e* I, so since I is 16 amps, then the voltage dropped is 1/16 volt or 0.0650 volts.
the problem then depends on "how fast does the fuse operate?".
“ A fuse is a device which protects the (circuit) against overload and short circuit.”
This device then solves the entire problem.
Adam Sandler will cast Derrick Henry in a movie if he rushes for 2,000 yards - NBC Sports
Mohan forgets that a fuse is a one-time device, and needs to be replaced if it is tripped.
At least they know the answer if they wanted it.
This one hit behind the barn.
Fresh iPhone 17 leak gives first close-up look at next-gen Apple smartphones - Mashable
These are simplified answers to the original question, and does not change anything I wrote above.
2024–10–11 [Victor Olarewsju Victor Olarewaju ]
If the nominal power is 4,000 watts then the current at 230volts is 16 amps.
But during the surge, the fuse will not blow if it is a longer duration and lower value )10 to 50%).
2024–10–00 [ Ammar Mahdi ] Ammar Mahdi
It also is a device that limits the change in current flow.
How does someone start doing urban exploration?
[image of Common-mode choke]
For this case there are devices called Metal oxide varistors (MOV).
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.
what exactly is a ‘surge’ protector?
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).
It’s been three xxx five werks, and there has been no response to my follow on query on his Commment to my answer.
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.
One
Pokémon developer Game Freak reveals Beast of Reincarnation at Xbox Games Showcase - Eurogamer
So, the voltage could go up to 500 volts, and the fuse will not open up.
Would individual surge supressors have save this equipment? most likely, since the surge supressor would take the jolt instead of the electronic components.
Edit 2024–10.
Brain ‘Reset Wave’ May Explain How ECT Rapidly Relieves Depression - Neuroscience News
eight
2024–10–14 [Omar Gharbi Omar Gharbi ]
I post the exact comment here.
Appendix Cancer Has Quadrupled in Millennials - AOL.com
This is 'the assistant's answer'
The other is “what does a “fuse” do?”
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.
What made you feel satisfied about your life today?
A fuse is a non-resetable over current circuit protector.
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?
(Dc diagram shown, AC is similar).
The third is lightning and “how it gets conducted into a home.”
[old diagram got deleted by accident]
The bolt then partially travels down the line to your home.
Do you feel uncomfortable when you come across cross dressers?
(There is no concept of polarity, in the loop because the current changes direction 100 to 120 times a second (power frequency).
“ … to protect building, lightning arrestor, is provided above building and directly connected to earth.”
At one ohm, the resistor has a maximum of 1 watt power.
The ‘inexcusable’ mistake Knicks made again and again in season-ending loss - New York Post
2024–10–11 [Bobby Sanchez Bobby Sanchez ].
so, the loop of wire then, when put together with another loop reduces the ‘noise’ on a power line.
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.
When does a woman know she is cumming?
So, it’s possible that these devices from Trip Lite have addition suppression devices, these ones seem to be sturdy.
but this device (an Inductor) … impedes the rapid changes in the current.
These devices are installed between the “hot” and “neutral” and protective ground.
What is lightning?
Barnstars:
He then describes the function of a fuse.
An AC voltage/ current source, and an ac inductive load.
But… the neutral is now “floating” because of the 1 ohm resistance.
But it can get overloaded, and no longer works.
It seems Mohan does not understand the difference between a comment and an Answer.
so, what happens?
He then describes Rainy Season and Lightning.
a photo is worth a thousand words.
Fuses, on their own, then operate much slower than the MOV variable resistance, during the lightning strike.
This is where the MOV conducts again, and dissipated the energy.
What does a fuse do?
There are two important concepts here.
One is “what exactly is in a ‘surge protector’ ? ”
Now when you have a certain ac resistance, then a current flows in a loop.
Upvotes:
OK, this is Mohan Rajaratnam’s definition of a Surge suppressor.
In schematic diagrams this is the symbol for a fuse:
A circuit breaker is similar, but is resettable.
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.
“ 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”
So combined with a device called a MOV or Metal-oxide-resistor, then forms the 3rd part of a “surge suppressor “.
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.
He then asserts :
but I think this circuit , shows a few more pieces.
2024–10–10[John johnson John Johnson ]
And this is the problem alone. Is the power supply in the equipmemt designed with a lightning strike in mind? Some yes, others, no.
nine
When the current is 200% of the rated value , it will “go open” (the link metal melts) and protect the device.
This is the picture of an electronic coil of wire wound around a core of magnetic material.
Here is a simplified AC power diagram.
2024–10–16 [ OO OLAOYE OYEBODE ]
Can the fuse protect the electronic devices from lightning instead of a surge protector.
This is where this question deviates from being a 'generic' question, and becomes more specific.
There are three different concepts here that are getting confused.
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.