Episode 31 - Control Relays - HOW THEY WORK & WHAT THEY'RE FOR

A relay is a type of electromagnetic switch, similar to a contactor, that can be controlled remotely with electricity, rather than needing manual input as a standard switch would.
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CONTROL RELAYS
Relays can be used to control normal loads, as a contactor would, however, the benefit of a relay is they come with multiple normally-open (N.O.) and multiple normally-closed (N.C.) contacts - allowing you to use it to power some things on while removing power from others at the same time.
The reason they are often called “control-relays” is that they’re typically used at lower voltages/lower amperages to control other devices such as contactors which are normally higher voltage and higher current. Many times you’ll find a control relay being controlled by smaller electronic circuits, events, or programs. When an electric signal is sent to engage the coil inside, it can send power to other devices which can turn them on or off - or both simultaneously.
THE COIL
On the inside of a relay you’ll find a coil of wire around two pieces of metal. When we send current through that coil of wire, the two pieces of metal suck together through electromagnetism. These pieces of metal that are opening or closing, are the “switch” for the relay to turn on and off.
Coils come in many different voltage ratings. There are many types of coils out there that are controlled at 12-volts, 24, 120, even up to 240. However, the amount of current (amps) that the contacts can handle flowing through them is typically lower - around 5 to 10 amps.
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#relays #contactors #electrical
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[@luislujan8715]

Most people at his level only use their knowledge to make fun of those under them. The world needs more ppl like him

[@sparkymissyAU]

I agree. Instead of sharing and teaching to make the job easier and better for everybody in the team

[@tellokbey6267]

You’re the best teacher on electrical subject, God bless you for sharing

[@patthebat394]

Please show us using relays or more specifically RIB relays for wiring them up to a switch! I am working on these at work and that would be absolutely helpful! Thank you for your time and patience making these videos! I am a forever a subscriber!!!

[@miguels7130]

Actually I am learning more in 10’S minutes in your videos than a year at work as a apprentice, yes I don’t have a good teacher over there . Great job men , God bless you .amigo .

[@terrencenyc6248]

I’m a fire alarm service tech and we use pretty much relays for the most part. NO and NC. Pretty simple, but this was definitely informative and gave me more knowledge I can use out in the field. Thumbs up

[@jmacruisecontrolfc8753]

So can an electrician also work in you’re area of expertise?

[@terrencenyc6248]

JmaCruiseControlfc yes

[@eduardomunoz430]

Is that low voltage?

[@vinceluviano5249]

Dude I've been watching you're videos. I cant wait to be an apprentice. I've been buying tools and learning so much. Thank you so much.

[@calebsmith599]

Will you ever do a video on plc’s and their functions as well as vfd’s?

[@jarrydee2799]

I would like that also

[@yayo2363]

Engineering Mindset, check him out on KZbin

[@Jason_Canada]

Vfd ..thats variable frequency drive ..its a speed controller basically bro

[@Jason_Canada]

I can see me being a co star on this

[@mississippihuas]

He probably doesn’t work in industrial where plc and drives would be used 24-7

[@checkswing576]

I love the vids, I supplement my classes with these videos and they really help reinforce what I am being taught. Thanks.

[@artisanelectrics]

Another awesome video!

[@abelagostinho]

I'm really enjoying these vids. Showing eletrical stuff in a simple and intuitive way.

[@ElectricianU]

I'm glad you're getting something from them my friend, thanks for watching!

[@raybeer549]

Excellent stuff, thank you. Never thought I would need to know anything about what you are talking about but I need to build myself something that will need relays and contactors and the two vids I have watched have helped out a lot from knowing nothing initially.

[@hugimelo]

Best electrical videos I have watched on youtube.....very well explained....thanks

[@adzeflores9373]

Great vids, bro! Video titles having episode numbers make watching easier. Kudos!

[@ronmccarty7537]

You are the best teacher on the planet! Thank you!

[@IsmaelTerrenoIBunkerteam]

I really like how you share the knowledge, amazing job!

[@javierferrer4634]

Excellent video! Thank you so much

[@kirkwilson7169]

Blessings brother Blessings thanks much for your time and teaching be bless you and your family and company.

[@bdemaree]

Ever since I was a kid I've loved turning relays into tasers. Use a 9v battery and set it up so the charge disrupts itself and cycles on/off with prongs coming off each end of the coil. Depending on the coil it puts out a hell of a discharge.

[@theazure4171]

make a vid

[@carloscheco9372]

Thanks a lot for your video. They are very helpful. Yes, please make a video on how to connect them per the diagram.

[@TRMNNYC]

For about three weeks, I have turned myself silly trying to figure out how to hardwire a multi speed whole house fan. I arrived at the concept of a "household solenoid," and then I came up with the word "relay." But then I hit a dead end, as I could not figure out how to take the next step. Your video seems to point the way. Thank you for your efforts. Your videos are excellent.

[@Jason_Canada]

From Canada looking forward too more of your videos ..the explanations are excellant ..cant wait for the advance relays stuff far as examples

[@2thebestsport839]

Thank you 🙏Sr. Much appreciated ✌️

[@dsugrim1763]

Great video Very informative

[@mrm768]

greatest explanation ever! superb!!!!

[@braenickeen6006]

just watched a old vid of yours on how to and i was wondering if you could do a vid on how to install lights in parallel or multiple lights together

[@khybersafi9137]

Would love to see a video on how to properly wire main panels and sub-panels and why ground and neutral is kept separate on every panel after the main panel but is joined together at the main panel. Thanks for the great videos.

[@musisir1927]

Thanx a lot for simplifying everything

[@jardonogilvy5485]

Thanks for that follow up video after the contactor/relay video, excellent explanation!

[@ElectricianU]

No problem! Monday 8/12 there will be one like this on contactors that I think is even better than this one. So keep your eyes peeled for that

[@dragon112x]

Helped a lot Thx

[@Malici0u5Intent]

Great videos!

[@anthonysmith9410]

Great vid!

[@ProfessionalKazak]

BRO YOU ROCK!

[@nograves456]

Much love bro

[@bradycase8786]

Love the videos man, I’m a controls tech and that is a great explanation for new guys in the field.

[@ElectricianU]

Thanks my friend, anything you think I missed or any other videos that you think the new guys could use?

[@bradycase8786]

Electrician U , I’m a new guy myself I’ve only been doing Controls for about 2 years I work for Siemens and one thing I would have loved to know was the mindset you have to have when learning from somebody above you.

[@ikerivers1795]

@@bradycase8786 it's always good to have a mentor

[@rocky_rocker_1235]

Sweet video! 👍 Now you got to build some type automated monitoring and control system.

[@lanthonyperdum6430]

Great video !!!

[@MrGuesly]

Big shout out to you brother. You saved me a bunch by watching your videos.

[@DanielRolfe]

Nice one ☝️

[@lesterwatson8519]

Good Job

[@John-zz5gt]

Thank you teach

[@derekw40]

Cool spider tat. Thanks for the relay vid

[@kaden1997]

I just started a few months ago as an apprentice on an industrial site and this helps a lot thanks!

[@azizmizrobov4058]

You are top!

[@teedee3879]

These are excellent videos! Thanks for putting out the information in a straightforward, no fluff manner. This has been a great review for me!

[@kevinsalomon4303]

Very good videos

[@AbdulWahid-fi7vs]

Hi Sir U have done good job. need a video on speed control relay or speed regulator thanks

[@mauriciomontero4754]

Can you explain how exactly a power packs work please

[@Jaiclickclik]

Good video will be doing any video on diagnosis relay operation and how to test relays

[@pbakai182]

Thanks for the info Dustin. You talked about the uses with light circuits, but what about something like turning on a fan - or increasing the speed of a fan - once a certain temperature is reached? Would you use the same device, but instead of a photocell sensor it'd be a thermostat temperature switch?

[@isaiahcastillo3087]

pbakai182 yes exactly, that would work. The thermostat switch leg would wire to the coil of the contactors or relay.

[@lucasjohnson2939]

Hi Dustin, great video. Would you do some videos on motors/motor controls?

[@ElectricianU]

Thanks my friend! I plan to, but I have to get through the next few months of content that I already have planned. I'm trying to build a large foundation for the basics before I dive off into more advanced stuff like that....but I will get there, I promise!

[@lucasjohnson2939]

Awesome thanks

[@theazure4171]

would the neutral be run straight through the box to the lights? its not switched obviously right? and just cus a realy is rated for 240v switching, you could still switch anything less than that right?

[@mariodiaz1385]

if you have a 24volt coil relay there is another point to connect the common wire?

[@salmanfarissk4258]

it was really great,please let me know how can i watch all your videos sir.

[@pedroflaquer1158]

Can I manually time a contractor ? Is there a time switch I can use?

[@denny3161]

Wish I knew this years ago on an interlock function for a 5' residential exhaust hood....I passed inpec using what I think was a flimsy sail switch!!!!

[@hewking]

Great stuff - i know you have to simplify stuff but do contactors not have auxiliary contacts as well which can be used for more involved logic with NC and NO contacts? that would make them as usable as relays - is that right? obviously contactors are for motors and larger currents

[@FishEyeSky]

When normally open for the ice cube relay, Why is the 3 to the left of the common but 7&9 are to the right of the common ?

[@dexter7939]

I am a new subscriber if u have time i would like to see videos of you wiring the relays for there use

[@JoseMartinez-pl5ci]

You need to make a video how to install a Relay please that will help a whole lot thank you for every video

[@stephenremillard9462]

I would like to control a 1.5hp pool pump 120v rated 19amp using a microcontroller like an Arduino. So I need a relay or contractor with a 5v or 3.3v DC input. Any recommendations?

[@robertrocheville7769]

What I want to know, coming from a twelve volt DC background, is how the coil pulls in? In DC the current goes in one direction, very easy. With AC, do they use diodes and capacitors?

[@paulmanhart4481]

Another good video. I have a small control box with a green on button, a red off button. I want to send 120 vac to three things when the on button is pushed. 1. A 120 vac indicator light. 2. An AC to DC converter. 3. To an aviation connector that sends the AC to another control box. What do I need? A relay that has three NO that turn to NC when power is applied? Is that an 11 pin relay? How do I wire that? Your help is appreciated. Thanks, Paul

[@daleseger4215]

I have seen people wire up an ice cube relay base with round holes in the socket and then try to insert a relay that has flat blades. My advice is to check the number of the socket to ensure it is compatible with the relay you plan on using.

[@nateuzamaki697]

Lit

[@danondiek439]

Can I use a high voltage input to start a low voltage circuit? Do such relays exist? Ie energize the relay with 240v to activate a 24v circuit

[@vincentmatthew6851]

I have a question whats the difference between a single throw and a double throw relay because they basically works the same

[@DjGho5t1]

Could you do a video on voltage drop?

[@allstarshotta]

Are you saying that if the relay shatters it means not enough voltage going to it or the opposite. Saw mines shattering the other day

[@hendriknieuwenhuizen4397]

How does a contactor relay operate in tandem with a timer?

[@PBS-nm1uu]

please do one on how to read the schematics. thanks

[@tristanalexander6955]

Hey man would you ever do a video about fire alarm systems? Cheers from a canadian third year!

[@ryanb1874]

Does this mean, that the coil in the relay is engineered so, that a voltage of 24 is the lowest that can overcome the coils impedance? Or am I mixing shit up?

[@gazyoung8490]

brilliant mo fo

[@tanyasobsessions2131]

does anyone know if things like exit signs and emergency lighting units have relays in them? if so, how are they tripped or whatever if they operate when power is cut out?

[@douglas2lee929]

Many "emergency light" systems have batteries inside the box. Often it is a lead acid battery about the size of a lawnmower or motorcycle battery. There is a small trickle charger and charge monitor circuit built in to the box that keeps the battery charged during normal situations (power is on). When the main power goes off, a relay kicks in which turns the emergency light on. This relay is controlled by some simple circuitry and a transistor or FET. If the system uses Lithium batteries, things are different.

[@keithgrimsleeper978]

I'd just like to see more over how they work in a real environment

[@Dementedracing]

Can you do a video of transformers . Step up/down , potential transformer , current transformer.

[@michaelconnor6028]

You ever look at Hydrostatic boilers systems?

[@Nick-vf3wf]

How do you wire NO vs NC?

[@Nick-vf3wf]

@@numberoneduno7265 that definetly helps thank you.

[@yogeshitaliya473]

Nice spider tattoos (brother)

[@mostafaryan7671]

Can any one recommend me any free book about control relay & their applications?

[@TheAlexProject13]

Do you know fire alarm systems ?

[@slump6982]

I've assembled Panels with theses before

[@joegonzales8855]

Does it matter on the coil if the neutral and hot are reversed.

[@Inflec]

Shouldn't matter as long as the voltage is correct.

[@joegonzales8855]

@@Inflec thank you

[@jolyonwelsh9834]

Normal means shelf position.

[@andrewcampbell1129]

Greetings, an electrician told me the USA Is really supposed to work on 240 volts like Europe and not 120. You agree with that statement?

[@chadhardwick9214]

Should have shown them a R.I.B.... confused lots of folks....

[@EdwinGarcia-vn9ri]

Fuese bueno que el video tuviese subtitulo

[@ElectricianU]

Necessito ayudar mi amigo! Viewers can help do translations on videos, click here if you'd like to help: support.google.com/youtube/answer/6054623?hl=en

[@antoniomontana9430]

Relay=Solenoid Switch

[@josetorree7237]

Its confuseing how two voltage

[@domrush2147]

I messaged you on Facebook

[@CristianZatonyl]

Hey man. Great video! I been watching you for a long time now. Just a personal opinion, the music/sound is pretty annoying/distracting. You didnt use to have it

[@anonymousperson4363]

The statement of contractors not being normally open and normally closed at the same time is false.

[@FazedClutch]

Everything is a switch

[@davidkafka2452]

I’m sorry but this video is a mess, the structure is all over the place. A better approach would have been: 1. Applications 2. Relay types 3. Technical details. Instead you vaguely hint at why relays may be useful ( primary benefit is it allows automated switching eg turning lights on at dusk) you mix that information in with a bunch of technical information at the same time that contradicts. For example you bring out a relay that uses 24 volt switching signal and then randomly start talking about 120 volt switching and then move to a different continent and start talking about 50hz relays…. Why? If this information was in a book format would your outline make any sense?

[@clismanramos5943]

Instead of repeating the same thing over and over do field examples

[@salb714]

You know, not that I don't like your explanations. But when you don't have it wired and actual examples of actual using it it's hard to figure out. Which is why I gave it a thumbs down. N now to find another video of being wired.