Why Varistor Is Used? MOV, Varistor and VDR Explained

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Күн бұрын

Why Varistor Is Used?
A varistor (voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. Varistors are used to protect a circuit from high voltage surges. When a high voltage surge is applied to a circuit, the outcome is usually catastrophic to the circuit.
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Timestamp
00:00 - Over Voltage
00: 23 - Varistor Working
03:24 - Connection of Varistor
#MOV #electrical #electronic #electrician #interview

Пікірлер: 61

@sufianwarsi3000 2 ай бұрын

Very good information to protect our Electrical Appliances from high voltage.

@tsbrownie Ай бұрын

Very good explanation. Thank you.

@rv10flyer84 2 ай бұрын

Thank you so much. Pro HVAC. Beginner in electronics, so that I can fix PCBs in my industry. Mainly mini split and inverter heat pumps. I’m so glad yours are in English too.

@ANTHONYBOOTH Ай бұрын

I have Categorically NEVER seen one of THOSE fitted INSIDE a PLUG!!! ...they need their own enclosure, precisely for when they do their job and Blow the Fuse because of a Surge (said sub-enclosure must be able to safely contain said 'BANG''

@bobodyuknow Ай бұрын

I thought about this and the MOV really is it's own protection device. It is only for surge voltage and the mov has a very fast transient response time rather than steady state so as soon as the voltage event is over the MOV stops conducting. The fuse is there for over current events from the load it is feeding. But I'm with you on the thing inside a plug it's comical.

@125brat Ай бұрын

They don't "Bang" like a fuse and if specified correctly for the level of transient they are used to protect against should survive indefinitely. They are specified by the energy in Joules they will dissipate in the very short-duration spike in voltage which causes them to conduct. Yes it seems a bit strange putting one inside a BS 1363 plug top and if the appliance needs it they're usually incorporated anyway, but if there's space and it doesn't affect dissipation of the MOV or creepage/clearances inside the plug top then I don't see a problem. It is also not accessible without the use of a tool per the regulations.

@jagmarc Ай бұрын

These are the things that put inside power socket strip strung between terminals like this. Costs 3 cents and they charge another 20 dollars for Surge Protected

@FaizelMoosa-og3yl Ай бұрын

What you know????

@jagmarc Ай бұрын

anthonybooth maybe you're referring to Zener Barrier they are really clever used in intrinsically safe stuff like in mining and chemical

@davidclarke5198 Ай бұрын

These devices are normally fitted on the pcb, not in a 13A plug.

@fixityaon9774 2 ай бұрын

Excellent basics👍

@sarc007 Ай бұрын

Nice video explaining the concept

@carlosgomes6074 Ай бұрын

Thank you, for a very well explained video about mov protection.

@laljayasundara7371 Ай бұрын

Thanks for the details.

@jamesallen6007 Ай бұрын

Excellent tuition. Many thanks.

@ramasawmysokanaden4298 Ай бұрын

Could u please tell what is the value of varister to use in the electric current plug

@Read_Relax. Ай бұрын

Very well said. Thank you. Very good explanation. This is what I am waiting for.

@Thankgod12345 2 ай бұрын

Thanks Is very understandable

@terryh8421 Ай бұрын

Thank you!

@sufianwarsi3000 2 ай бұрын

Good information & suggestion but you didn't mentioned the value of MOV which we can use in plugs or in line to protect our Electrical Appliances....????

@iffee100 Ай бұрын

Nice explanation. Can you specify some MOV numbers for 230v AC circuits. ?

@user-nr1wn9qt1m Ай бұрын

Thank you

@avtarsinghazad8517 Ай бұрын

You have very precisely described the importance of MOV And fuses I wish you all the best and request you to please post more information on safety electronics items I recently got a gift operated on (24 volts AC power 20-40VA only) Please suggest MOV AND fusable Resistor 🙏

@richfuturebydsk2562 Ай бұрын

Thanks a lot 🙏 Much support from 🇿🇦 ZAR- Durban Rich Future by DSK Clothing ❤

@ArifinSabuz Ай бұрын

Thank you ❤

@raulhidalgo2267 Ай бұрын

Damn I've seen those in use in the plant at work at but had no idea why they were installed ,even when I asked the older maintenance guys they also had no idea what these do, thanks for video it was super informative.

@kaundabwalya7776 Ай бұрын

Same here Man!! Thanks So much Sir!

@badrinath6059 Ай бұрын

Good video, what are the vdr values available in the market

@overunityinventor Ай бұрын

what if we connect caps instead of varister? will the flyback charge the caps? we can use the charge in the caps for other work

@dimalranasinghe8152 Ай бұрын

Thank you for the information. What is the part number for VDR that we can use for 230v AC? Thanks.

@markatherton7848 Ай бұрын

MOV should attached on far side of fuse; they occasionally fail short !!

@SwgwmTJB Ай бұрын

Plz share a clear image of circuit (plug), and how to choose that MOV

@doughostetler8972 2 ай бұрын

Does this component help a GFCI to work correctly? Thanks for your video.

@naturetruth5218 Ай бұрын

I have never seen anything other than a fuse in a standard three pins plug. Such standard plug is not design for adding a MOV with expose legs that can cause short circuit. Still such MOV connection does work as cheap improvised voltage surge protector to accelerate blowing of fuse as extra protection to electric appliances. This is especially essential in poor countries like India & Myanmar where power supply is very unstable. Also in region lacking of lightning strike protection that always burn entire building electronic devices during a thunder strike, such MOV can act as cheap improvised surge protector in extra protection. However its recommended to use standard surge protector install in circuit breaker board or wire extension for proper protection, which can be reset after get trigger to cut off power supply safely. Otherwise make sure the MOV is connected behind a fuse (not before) to prevent sustainable spike of current like short circuit during long voltage surge. If i remrmber correctly, in Three Phase power supply lines, when the bad grounding of a star connection is loose, the voltage between two lines (Live & Neutral) will swing from 220V to 440V burning all the electrical devices. I had such bad experience living in a backward country.

@tonyrebeiro Ай бұрын

Your explanation as far as the operation of an MOV is ok. But your explanation does not cover the practical side properly. All mov's come in various triggering voltage and current clamping ratings. To effectively use an mov for voltage surge and spike protection, a good quality fuse of the appropriate rating is the first requirement. The rating of this fuse is selected, based on the device it is powering. Once this fuse rating is selected, the mov clamping current rating is selected, to be at least 50% higher than the fuse current rating, so that it is capable of rupturing the fuse easily, without damaging itself. The voltage rating of the mov is selected depending on the maximum voltage that can be safely tolerated by the protected device. And finally, it is not recommended to install an mov inside a plug top, for physical safety reasons.

@lawrenceatkinson Ай бұрын

How is the "Varistor voltage" determined for use in any circuit or to provide power protection just by looking at the varistor itself?

@lawrancealbanabcnoronha7472 Ай бұрын

Can you suggest what number MOV should I use for my TV and other electronic device pluy on extension box . I am Mumbai

@odoohub5010 Ай бұрын

At 7:25 If the MOV is burnt will it be shorted or open?

@samuelfellows6923 Ай бұрын

I have never seen one inside a 🇬🇧 plug and there isn’t room for one = we have the cartridge fuse in the plug for protecting the wire from the plug to the appliance, I tend to find the MOV inside the appliance itself

@TheElectricalGuy Ай бұрын

Its not a click bet some of the companies provided this to protect the electrical devices not in all but only in few. But the concept of the video is to tell you how a MOV Can protect your electrical Devices

@wisher21uk Ай бұрын

@@TheElectricalGuyI too have never seen this in any plug, and I agree there is not enough room to put it in

@naharrabi5510 Ай бұрын

Thanks for elaborate explanation.

@Ayaan90953 2 ай бұрын

How to select mov domestic appliance purpose please explain sir

@bobisyouruncle1 Ай бұрын

MOV'S are usable for only a single surge. Therefore, not sure if using it across a switch is a viable idea...

@125brat Ай бұрын

MOVs aren't single shot devices. Provided they are used within their specifications they should last indefinitely. Ideally it should be connected downstream of the fuse so it's protected by the fuse but that's not easy with the fuse carrier in a BS 1363 plug top.

@Tony770jr Ай бұрын

Good explanation. Thanks for making the video.

@merwynvincent Ай бұрын

Nobody understands the concept, he just reads whatever is there in a book!!😂!!

@sham1234567891 Ай бұрын

Default sound level too low.

@FaizelMoosa-og3yl Ай бұрын

I use hearing aid

@sufianwarsi3000 2 ай бұрын

Kindly increase the volume level of this video, Bcoz Ur voice is so low to understand.

@rv10flyer84 2 ай бұрын

You need to check your phone or computer because his volume is perfect.

@sufianwarsi3000 2 ай бұрын

Very Bad to argue than resolve the issue.

@kaundabwalya7776 Ай бұрын

His sound has owez been 💯 perfect. Just check ur 🔊 output settings well

@deang5622 Ай бұрын

@@sufianwarsi3000Sound is perfect on my mobile device. The problem seems to be with your device. Firstly it is not within the other poster's capability to resolve the issue. I don't know why you think it would be. Secondly, by his telling you that the sound is perfect for him, is not him being rude. He is giving you information to help you diagnose the problem. That is a good thing.