What is MOV? | How to select a MOV?? | Metal Oxide Varistor | Varistor Diode

#MOV #MetalOxideVaristor #TransientVoltage

0:00 Index
00:43 what is MOV?
00:57 Working principle of MOV
01:29 How can MOV be used as overvoltage protection
02:11 Aplication of MOV
3:09 Structure of MOV
4:01 Advantages of MOV
4:41 Selection criteria of MOV
4:51 rated Voltage
5:15 Clamping voltage
5:40 Surge current
6:28 Leakage current
6:55 Response time
7:20 Disadvantages of MOV

this is the 4th part of the series 'How to select a Diode'
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[carlanwray]

Thank you so much. One comment, when you are going over something like this it is really helpful to go through a datasheet and show the values. You did that for one but just to show a quick screen shot for each value it is most helpful. Doesn't need to be a lot, just enough to link what you are saying to a real datasheet. Thanks again for all the help.

[Thrashenizer]

Great work Chief !
Direct techno -> to the point.
Thank you

[Sumazure]

Was looking for a description of MOV parameters to do a replacement and came across this. Appreciate the detailed explanation. Thank you. 👍

[Gersberms]

Excellent summary, thanks for the schematic as well.

[arkapadma]

very informative, thanks... thing that missing here is how to read varistor code.

[nigel-matthews]

Excellent video - thank you for posting it!

[JaykeSapalaran-iqqs]

Great video information 👍❤ thank you for sharing your knowledge and experience 🇵🇭🫡

[jamesallen]

Excellent video content. I have subscribed.

[saviourdelvin]

eeeeh man thanks for that great info... keep that good work. but i wished to know how they are connected both in 2 phase and 3 phase input. looking forward to seeing your response. thanks tho. much love from UGANDA

[mrtechie]

How about 220-240VAC?
Leakage current?
Should I use a 431 or 471 volt MOV?

[WestCoastMole]

Thanks for the video. It is very informative. I do have a couple of questions. Classic schematics of High Speed Vacuum use a capacitor to suppress the Back EMF to protect the keying circuitry when the relay is released. Could a MOV used as a substitute for the capacitor ? The voltage used to actuate the relay is 26.5 volts which seems well within the capability of the device. My concern is the durability of the device. The relay and the coil driving it are both small so I would imagine the energy generated in the Back EMF spike is not all that big. However the device is keyed at a high rate. Is there any way to determine the durability of an MOV? Do MOVs break down quickly? Are they suited for this type of operation ?

[surgingcircuits]

Thanks for a very good video. To test a MOV, do you do a simple continuity test that should show a very low resistance?

[vinaymathapati]

Bro I have a project...please help me.
I need a diode which can pass a certain voltage, say 5v.
It must not conduct if the supplied voltage is lesser or greater than 5v.
Please help me.Which diode to use?

[salsal]

Hello

Thank you for your educational information.

I have two devices which I want to protect against high voltage (220 V).

The varistor should clamp at (150 V).

1st device:

120 Volts
550 Watts

2nd device:

120 Volts
2, 500 Watts

My question is:

What's the right (MOV) size for each device?
What's is the varistor's:

Diameter
Resistance
Voltage
Ampere. 

Thank you so much.

[rameshwarshelke]

Nice info...sir 🙏
Can u make vdo how to select inductor and capacitor value in any ckt..

[youssefdirani]

Very interesting. I wonder when it clamps the voltage, where does the excess voltage go ? Also, does it act in this case as an ideal voltage source of 0 internal resistance ?

[rootvalue]

0:38
The working principle
Uses
Advantages
Disadvantages
And selection criteria

For “HEY GUYS”

[nimalperera]

Good lesson for us as beginners in electronics. I learnt a lot about MOV's. I have 4 Panasonic bluetooth tower speakers, and now 3 are defective. When I checked the circuit in one speaker, I found the fuse was blown and the MOV damaged. I presume a high voltage spike had entered and as a result the MOV got damaged and the fuse blown. I changed the MOV. The fuse blowing stopped, but the problem is not fully solved yet. I can see very clearly a small damage (a tiny hole) on the surface of the MIP2F2 IC of the circuit, which I doubt to be a crack on it's surface. Could this be a result of the high voltage passed into the circuit? Grateful for your expertise advice.

[jakkahao]

What varisitor number to be use at home main line 220v.

[gtechninja]

tnx, bro! please do the math for a specific voltage.