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?
10.06.2025 00:05
a photo is worth a thousand words.
First Sentence:
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so, what happens?
It seems Mohan does not understand the difference between a comment and an Answer.
The bolt then partially travels down the line to your home.
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If the nominal power is 4,000 watts then the current at 230volts is 16 amps.
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He then describes Rainy Season and Lightning.
Now when you have a certain ac resistance, then a current flows in a loop.
These are simplified answers to the original question, and does not change anything I wrote above.
Edit 2024–10.
He then describes the function of a fuse.
This is 'the assistant's answer'
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A fuse is a non-resetable over current circuit 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.
At one ohm, the resistor has a maximum of 1 watt power.
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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.
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In schematic diagrams this is the symbol for a fuse:
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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?".
Fuses, on their own, then operate much slower than the MOV variable resistance, during the lightning strike.
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[image of Common-mode choke]
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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So combined with a device called a MOV or Metal-oxide-resistor, then forms the 3rd part of a “surge suppressor “.
This device then solves the entire problem.
So, the voltage could go up to 500 volts, and the fuse will not open up.
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Would individual surge supressors have save this equipment? most likely, since the surge supressor would take the jolt instead of the electronic components.
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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.
And this is the problem alone. Is the power supply in the equipmemt designed with a lightning strike in mind? Some yes, others, no.
At least they know the answer if they wanted it.
“ … to protect building, lightning arrestor, is provided above building and directly connected to earth.”
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 is where this question deviates from being a 'generic' question, and becomes more specific.
There are three different concepts here that are getting confused.
but this device (an Inductor) … impedes the rapid changes in the current.
The third is lightning and “how it gets conducted into a home.”
Here is a simplified AC power diagram.
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.
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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(There is no concept of polarity, in the loop because the current changes direction 100 to 120 times a second (power frequency).
This is the picture of an electronic coil of wire wound around a core of magnetic material.
Can the fuse protect the electronic devices from lightning instead of a surge protector.
But it can get overloaded, and no longer works.
what exactly is a ‘surge’ protector?
The other is “what does a “fuse” do?”
An AC voltage/ current source, and an ac inductive load.
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.
What is lightning?
He then asserts :
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Mohan forgets that a fuse is a one-time device, and needs to be replaced if it is tripped.
I post the exact comment here.
There are two important concepts here.
“ A fuse is a device which protects the (circuit) against overload and short circuit.”
[old diagram got deleted by accident]
The MOV will conduct when the voltage exceeds 50% of line voltage.
These devices are installed between the “hot” and “neutral” and protective ground.
OK, this is Mohan Rajaratnam’s definition of a Surge suppressor.
For this case there are devices called Metal oxide varistors (MOV).
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so, the loop of wire then, when put together with another loop reduces the ‘noise’ on a power line.
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So, it’s possible that these devices from Trip Lite have addition suppression devices, these ones seem to be sturdy.
but I think this circuit , shows a few more pieces.
It also is a device that limits the change in current flow.
(Dc diagram shown, AC is similar).
This is where the MOV conducts again, and dissipated the energy.
A circuit breaker is similar, but is resettable.
This one hit behind the barn.
But… the neutral is now “floating” because of the 1 ohm resistance.
What does a fuse do?
Because the load is inductive, the current lags the voltage.(by a bit).
But during the surge, the fuse will not blow if it is a longer duration and lower value )10 to 50%).
“ 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”
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 problem then depends on "how fast does the fuse operate?".
One is “what exactly is in a ‘surge protector’ ? ”
P = e* I, so since I is 16 amps, then the voltage dropped is 1/16 volt or 0.0650 volts.