How a Surge Protector Works (Metal Oxide Varistor)
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- Опубликовано: 30 сен 2024
- How a common surge strip works explained by GE Global Research Engineer Bill Morris. The GEMOV surge suppressor was developed first in 1973 by John D. Harnden Jr., François Martzloff, and William G. Morris in Schenectady, NY. This revolutionized power control for all computers and semiconductor devices. The device was put into production by 1976. Hundreds of millions were produced within a few years. Morris investigated the relationship of crystal size to volts and resistance. Work started with the Thyristor and Zener Diode.
Ge doesn't even make mov's anymore, yet they invented it.... Pretty funny if you ask me...
I am glad to have found your informative channel.
Nothing like having the inventor explain it all to you!
Thanks for making this great video, I am trying to learn and you defiantly great at teaching!!
Works well in conjunction with a voltage monitor relay...on it's own, damage to equipment still occurs
how do you test Surge suppressor Siemens SIRIUS 3RT2916-1DG00 that is working
Absolute genius man
was hoping this would demonstrate the volts shooting through the bar
Hi, great video, will definitely subscribe.
I need help, I have something attached to my old relay called a Contact Protecter.
This vintage relay (1959) with copper leaf springs and it has a contact protector. Part made by "Federal" 15A2PS2
I need to replace this part and not sure the new equivalent part or even how I measure for the value using a multimeter which I do have.
I'm just not sure what spec I need to look for on Mouser.com. I am ordering a few other parts with them so I'm sure they would have what I need if I knew what to look for.
Any help, greatly appreciated.
Thanks
With all due respect...He does not tell you that while the MOV needs to wait for the voltage to rise to a certain level before it opens, the current from the surge is riding along unopposed into your computer. Think of a wave of water. The MOV is like a float in the water. The MOV trips the drain to lower the water level only after the wave rises to a certain level. All the while, more water than you can handle is coming at you. The IEEE defined the worst surge as running 3000 Amps! That is likely to happen 100 times a year in your home. Cheap MOV surge suppressors do not throttle the current at the same time as the voltage is rising.
You realize, that he is the guy that invented the Metal Oxide Resistor right? :)
I've worked with surge protection for 30 years on telecommunications equipment. MOV's work slower than the new clamping devices but they usually never fail or get damaged as often as the newer clamping devices. We always went by the four foot rule: the surge protector is placed four feet or more in front of the protected equipment on AC, telco lines, any communications cable connecting to the equipment. A surge can travel approx.three feet past the surge device before it would clamp and dissipate the surge to ground. Our surge device placement techniques was very successful and equipment damage even during severe lightning storms dropped down to direct building hits only even with the old MOV clamping devices..
1:00, he does tell
Lol
Yes for a computer i would use no less than a voltage regulator
Great development protecting equipment worth billions and billions of dollars and saving us from downtime and headaches !
how do you test one?
Nice video, thanks
I picked up an old Hickok Teaching System with all these beautiful parts :"D
glad i could find out what thee varistor was!! :")
i always thought the new ones i find in computers were fuses! :")
very nice overview
Can I reach this technician somehow?
I was studying Astron power supply schematics now I'm here thank you for the video 😊
Thank you for the information :)
I have 220 volt power strips I want to use with 120 volt devices and a 120 volt power source. To be safe, I would like to install a MOV surge suppressor. What should the voltage rating be for this MOV suppressor?
I have two Consumer Units in my house connect to the same incoming Power Meter. One CU is an old one using ELCB as protective device made in 1983 to BS 4293 which always trip when there is heavy lighting strike during tropical thunderstorm. The other is installed recently protected by RCCB :BS4293 which does not trip even when the old CU trips. The Meter is connected to OH Power lines, 240v. Any logical explanation? If it is about old ELCB can I change to RCCB same as the new CU.
would be nice to know to read the info printed on the MOV so I can get the proper replacement or better suited replacement MOV part. mine says S10..K275 and on tho bottom 12 51 it's a blue one about 10mm in diameter and about 3mm thick
I've recently bought a job lot of electronic bits and bobs. witch included s### loads of varistors. I'm just getting started with hobby electronics and have no use for them. dose anyone have any suggestions? it would be a shame to bin them or just let them collect dust.
Thanks Simon
will it still work if my home doesn't have ground connection?
thanks very helpful
Issent this just a non linear voltage dependant resistor?
yes
wow 20 joules... cool
Pretty much correct but the over-current protection device isn't going to trip. If you short circuit hot and neutral what's the potential difference between them. You guessed it zero. I know it's confusing as hell. Start looking at the datasheets for them. That will piss you off ; it did me. They shove like 20 mov's on a small log log graph and expect the customer to be satisfied. Here's what i'm talking about
mouser.com/ds/2/240/Littelfuse_MOV_CIII-40488.pdf
Thank you for this interesting video, very well explained.
I believe the term "thermal fuse" as used is a misnomer. Power strips usually have circuit breakers instead of fuses, but even if it is a fuse, it is not a thermal fuse, but a current fuse. The former is designed to open at a given temperature regardless of the current passing through it (e.g. in consumer fan motor windings), whereas the latter is designed to open at a given current regardless of the ambient temp. (however it will open if the temp. is hot enough to melt the fuse element).
seen some pic of them and some popped and when on fire. how is it safe lol.
Thanks!
can you tell me that if I use Circuit Breaker in place of Metal Oxide Varistor. will it Surge protect devices?
Circuit breaker will not protect against surges, that's why this is such a wonderful simple device. it adsorbs surges and helps keep the currant straight and level. Circuit Breaker trips for overloads or shorts. say if you plugged in two air compressors or try to use toaster oven and the microwave throw in a coffee pot on the same plug/outlet at the same time shortly thereafter it will pop/trip the breaker. this keeps the wires that feed the plug from over heating and catching fire. that's why replacing breakers with bigger ones is not a wise idea. sure it will work, but over time it will damage the wire.. FYI
what's wrong with the graph.....
Who is MR Bill Morris to MR G.Morris?
Where can I purchase one ?
Thanks, good job
Is it a varistor diode?
Thank you.
it is so great work!
whhhat a varistor is a diode for dual-directions!!! Bad-Ass!! thank-you thank-you!! :"D
What about voltage droppings?
Put them in a doggy bag.
@@DasAntiNaziBroetchen I like dogs
something like a diode :)
sounds like his mouth is watering 24/7, perhaps he has a nice steak infront of him.
That is why this guys a day earning will be your monthly earning.!
How's it hangin' gramps. I respect the fact that you're probably somebodies likable, old grandpa, but just because you got a degree back when school was cheap and cool, you don't automatically become the 'go-to' guy for teaching 'modern' electronics. You're actually a little TOO old-school and too old in general, and not a good teacher (didn't solve my query). I guess it's like listening to Thomas Edison speak if he were alive today. I'm glad we caught you before your afternoon nap (and more permanent nap).
+Brian Tumor While I agree these old dudes would be pretty worthless around a PC and an Arduino, you have to respect the fact that they practice old Techniques and have old knowledge that is simply not around anymore. Just recently I had to do a repair on a vintage power supply that uses a magnetic field type of voltage regulation, which is unheard of nowadays. A call to an old guy taught me more in the few hours I spent with him than any class I've ever taken, and the power supply is working again. This principle also applies to many things outside of electronics. So have some respect and maybe you'll learn something you never knew possible..
I'm sure that you would appreciate having the instructions to your Bluray player include how a VHS player works, but history does more to dissuade the use or even consideration of the history of old technology.
I think you probably didn't get an adequate education in the fundamentals of electronics. It's not entirely your fault because as tech has advanced, the principles upon which it is based have become less important than pushing all of the more advanced ways that it is being combined in more sophisticated ways. The educational system is trying to stay ahead of the curve, so to speak; to keep up with the advancements in tech development. That old fart only knows as much about the developments in his career field because he was knee deep in the fundamentals of the science behind it. If you go to school today, you're unlikely to have time in your curriculum to learn the fundamentals as he understood them, lived them and dealt with them every day. This information is in books -- you remember, those non-pdf format collections of finely printed and bound paper things you might have seen in the library. Believe me, the books are much better at this.
You are correct in saying my education was inadequate as most of it happened officially in the mid to late 90s, the rest since that time has been self taught with various hacker group/spaces to keep up with all the cool microprocessor stuff going around. And again, this dude would be of no use in these areas.... However there has been times when knowing some fundamentals has proven, well fundamental is getting things fixed. The problem I see is most techs anymore are nothing more than board or little black box changers and couldn't get to the root of the problem within the circuit itself. Also, as stated before I sometimes get old Tube based Amplifiers that are still in active operation that people use and need repair. Who else would know about that stuff but an old guy.. lol... So for that I have respect and have learned tons from them, along with all the crazy hackerspace coders. Makes me well rounded I suppose..
+Brain Tumor Uh, who are you talking to? Do you really blame Bill Morris for not "solving your query"?
LOL as if 'gramps' (as you so eloquently refer to) is the one producing, editing, or even asking the questions in this video!
It's obvious, this video was dumbed-down and is almost useless; but that isn't Bill's fault.
Please don't refer to old folks that way. I may have made a disparaging reference (look it up, nitwit), but I respect older folks. One day you'll be an old drag queen and know what I mean.