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13 March 2010
Author: Giorgos Lazaridis
How Relays Work





Some types of relays

I've receive many emails concerning this subject. Relays are essential for automation systems and for controlling loads. Also, relays are the best way for galvanic insulation between high and low voltage portions of a circuit. There are hundreds of different relay types. Let's find out first how a relay operates.



Basic Relay Operation
The Contacts

Before extending to the various types of relays, i will first explain what and how the basic relay operates. Each relay has two mechanical parts inside. The first one is the contact(s) of the relay. The contacts operates similarly to the contacts of a simple switch or pushbutton. You should consider the contacts as a pair of metals like the following diagram:





The two terminals operates as a switch. When the contacts are 'in contact' then the current flows from Terminal 1 to Terminal 2. There are two types of contacts: the NO and the NC. NO stands for Normal Open contact, while NC stands for Normal Closed contact. The Normal Open is a contact like the one showed in the previous illustration. When the contact is still, then no current flows through it (because it is an OPEN circuit). On the other hand, a Normal Closed contact allows the current to flow when the contact is still. Bellow i illustrate both of these contacts:





You may notice that the NC contact is turned upside-down compared to the NO contact. This is done in purpose. This way, both contacts (NO and NC) will change state if a force is applied to the left metal heading from UP to DOWN. The following animation shows how a NO contact operates by lighting a light bulb:





As for the NC contacts, it works exactly opposite as the NO contacts. Look the following animation:







A combination of contacts

A relay may have a combination of the above contacts. Look at the following illustration





In this case, there is a 3rd terminal called "COMMON". The NO and NC contacts are referred to the COMMON terminal. Between the NC and the NO contact, there is no contact at any time! The following animation shows how this pair operates:







And WHO defines the NORMAL state?

OK, we have the NORMAL open and NORMAL closed contact. But which state is considered as NORMAL? Going one step closer to the relay operation, we find the spring. This spring defines the NORMAL position of the COMMON contact. If you see the above 3 animations, you will notice that one time an F force is applied to the COMMON terminal, and the other time there is no force applied. Well, this is actually wrong. There is indeed another force that pulls the contact towards UP and this force is applied ALL the time. This force comes from the spring. Look the following image:





Now you can see who is pulling the COMMON terminal UP all the time. So the spring defines what is the NORMAL state, and thus defines which contact is the NORMAL OPEN and which the NORMAL CLOSED. In other words, the NORMAL state is defined as the state that there is NO other force applied to the COMMON terminal except the one from the spring.




The last part - WHO moves the common contact of the relay?

This is the last part of the relay operation. The device that forces the terminal to move, is actually an electromagnet! A coil is placed right under the contact. When current is flown through this coil, a magnetism is created. This magnetism can overcome the force of the spring and can pull the contact towards it, thus it changes it's position! And due to the fact that the contact is usually a small piece of metal not capable to be pulled by the electromagnet, another piece of metal is attached to the common. This piece of metal is so called "Armature". Following is (at last) the complete illustration of the basic relay:





Now, imagine that someone wants to control a 220Volts 1 K-Watt load with a command that comes from a 5 Volts battery. A load-Relay should be used for this application. The Coil of the relay is driven with the 5 Volts. The contacts from this relay (NO) will be connected in series with the power supply of the load. Thus, the load will only operate when the relay is actuated. Our friend bellow will turn on an electric oven bare-handed!!!




















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  • At 18 September 2014, 13:50:07 user karim wrote:   [reply @ karim]
    • Excellent sir


  • At 29 July 2014, 16:19:53 user ganesh wrote:   [reply @ ganesh]
    • thank you so much sir


  • At 16 July 2014, 15:51:06 user deb sankar mukhopadhyay wrote:   [reply @ deb sankar mukhopadhyay]
    • your explanation and animation is just awesome, keep the good work, God bless you.


  • At 15 July 2014, 9:36:00 user Tony wrote:   [reply @ Tony]
    • good work..can yoy tell methe industrail realay connection and how its working


  • At 23 May 2014, 19:27:21 user niki wrote:   [reply @ niki]
    • AWESOME tutorial. Basic concepts of relay is covered very well.
      5 starts to the author.


  • At 10 May 2014, 12:15:23 user meghan wrote:   [reply @ meghan]
    • Awesome to Undestanding..............


  • At 8 May 2014, 9:13:59 user Mohammed Wajeed wrote:   [reply @ Mohammed Wajeed]
    • hurrayyy !!!! finally found the way how relay actually works.. thanks for your good explanation and hard work :)


  • At 7 May 2014, 10:14:54 user RAJESH G wrote:   [reply @ RAJESH G]
    • first of all .i thank uuuuuu..for this web page....it give more knowledge on basics ...thank u


  • At 13 April 2014, 16:33:02 user jeff wrote:   [reply @ jeff]
    • i am a student and i found this very informative and understandable. thank you for this as i am sure i will reference it often.


  • At 2 April 2014, 8:37:04 user Ram Krishna Sharma wrote:   [reply @ Ram Krishna Sharma]
    • Very good material conceptually as well as analytically. It will help students in projects as well as in ordinary applications of switching.


  • At 13 March 2014, 18:31:44 user Michael G wrote:   [reply @ Michael G]
    • Thank you for this post. Of EVERYTHING on the internet about relays, this post finally made me understand.

      Thank you. Thank you. Thank you.


  • At 5 March 2014, 11:22:50 user sikandar wrote:   [reply @ sikandar]
    • awesome !!!!!!!!!


  • At 3 March 2014, 3:46:31 user MOHD IMRAN QURESHI wrote:   [reply @ MOHD IMRAN QURESHI]
    • AWESOME TRICK OF EXPLAINING RELAY


  • At 23 February 2014, 15:10:28 user godfrey wrote:   [reply @ godfrey]
    • Good and technical explanation
      But where does the neautal go.thx


  • At 18 February 2014, 15:39:54 user kunal wrote:   [reply @ kunal]
    • so nicely explained...


  • At 17 February 2014, 22:26:59 user SURAJ wrote:   [reply @ SURAJ]
    • Awesome to Undestanding..............


  • At 24 January 2014, 14:53:17 user ravi wrote:   [reply @ ravi]
    • nice and clear and got understood thanks a lot and keep giving information like this which helps us to improve our knowledge thanks............


  • At 3 January 2014, 9:54:45 user sahabh wrote:   [reply @ sahabh]
    • Jabardast...!!! THANX..!I Like it.


  • At 15 December 2013, 6:05:06 user Ashesh Kharidia wrote:   [reply @ Ashesh Kharidia]
    • Understands Basics very easily. Very Nice


  • At 26 November 2013, 4:17:32 user Gaurav wrote:   [reply @ Gaurav]
    • Nice and Clear. Animation is self explanatory. Thanks.


  • At 24 November 2013, 18:27:24 user Rayar.B wrote:   [reply @ Rayar.B]
    • Very nice explanation


  • At 9 November 2013, 11:32:21 user naresh wrote:   [reply @ naresh]
    • nice teaching...... easy to understand


  • At 26 October 2013, 17:32:41 user shradha g wrote:   [reply @ shradha g]
    • wooww.... nice..easy to understand . :)


  • At 7 October 2013, 3:23:11 user aniket wrote:   [reply @ aniket]
    • very nicely written & it helps me to understand relay very nicely....
      thx


  • At 18 September 2013, 11:19:41 user Jacky Woo wrote:   [reply @ Jacky Woo]
    • Hi, I have a usb relay current - Up to 16Amp @24vdc or 250vac, I wanted make it work like a light switch to turn on a light on my front door! How would i wire it? Thank you in advance!


  • At 16 September 2013, 11:21:58 user manikappa wrote:   [reply @ manikappa]
    • this nice experiment......


  • At 9 September 2013, 14:58:18 user chandan shee wrote:   [reply @ chandan shee]
    • very nice explain


  • At 29 August 2013, 6:17:34 user saravanan wrote:   [reply @ saravanan]
    • explaniation is very good.. keep going on... thanks a lot...from hereafter i can do the mini projects in my home... this website very useful for all... thanks alottt....


  • At 24 August 2013, 2:50:56 user FatnessFirst wrote:   [reply @ FatnessFirst]
    • I just want to say. THANK YOU. I've been researching about relays for 5 hours straight only to be left confused. You pretty much showed it in such an easy way and EVEN STATED that their are different kinds and purposes...no wonder i'm god damn confused the whole time


  • At 20 August 2013, 11:29:43 user sanam pudasaini wrote:   [reply @ sanam pudasaini]
    • very good post... :) i expect more such post in coming days...


  • At 3 August 2013, 6:59:04 user Jableen wrote:   [reply @ Jableen]
    • a lot helpful


  • At 26 July 2013, 15:39:56 user birendra wrote:   [reply @ birendra]
    • very useful information ! thanks a lot, you really cleared my doubts regading relay opertaion. now i can do my home automation project without any fear of damaging my arduino.,


  • At 23 July 2013, 19:25:39 user Jayesh wrote:   [reply @ Jayesh]
    • Grate....
      Well teaching trick....


  • At 20 July 2013, 5:32:09 user ananth wrote:   [reply @ ananth]
    • nice explanation


  • At 19 July 2013, 7:27:22 user TALHA wrote:   [reply @ TALHA]
    • NICELY EXPLAINED....


  • At 11 July 2013, 13:06:14 user owen wrote:   [reply @ owen]
    • thanks i found it very virtal for i was confused on how i can make an automatic gate closer. If u do mind please asist me wth more illumination to this e-mail okamphata@hotmail.com thank u pipo


  • At 23 June 2013, 16:02:02 user Lance wrote:   [reply @ Lance]
    • Nice post. Short and sweet.


  • At 23 June 2013, 10:05:34 user Nelly wrote:   [reply @ Nelly]
    • Hi I have too signals to be brought back using relay? or relays? one is 24vdc for a plc signal and the other is volt free for a telemetry alarm how can this be done?


  • At 20 June 2013, 4:43:10 user online education wrote:   [reply @ online education]
    • it is really very good post..
      thanks


  • At 20 June 2013, 4:11:08 user Gramzrah wrote:   [reply @ Gramzrah]
    • Thanks I Salute you


  • At 6 June 2013, 5:59:15 user zaeem wrote:   [reply @ zaeem]
    • nice one


  • At 21 May 2013, 15:22:39 user salik wrote:   [reply @ salik]
    • thanks brother it was very helpful for me. Nice animations.


  • At 14 May 2013, 9:52:19 user Best wrote:   [reply @ Best]
    • This is very helpful! Thanks a lot for your efforts!


  • At 10 May 2013, 11:46:44 user amol wrote:   [reply @ amol]
    • very simple to understand and impressive.


  • At 20 April 2013, 2:26:14 user sudeep wrote:   [reply @ sudeep]
    • very nice explanation....good method to understand...use of animation is very helpful in understanding the concept...thanx alott:-):-)


  • At 15 April 2013, 21:10:17 user Snehal wrote:   [reply @ Snehal]
    • Great explanation ! I finally have understood how a relay works ! I hope u keep the website updated with more explanations !


  • At 11 April 2013, 10:59:49 user Harry wrote:   [reply @ Harry]
    • thank you for giving this information,it is easy to learn and nice explanation....


  • At 10 April 2013, 17:49:12 user Abhijeet wrote:   [reply @ Abhijeet]
    • good one! very helpful, thanks...


  • At 8 April 2013, 10:04:57 user kanyakumari wrote:   [reply @ kanyakumari]
    • very good explanation with showing pictures thanks a lot


  • At 5 April 2013, 9:22:27 user Neelam wrote:   [reply @ Neelam]
    • thanks for giving clear idea about relay.


  • At 29 March 2013, 20:19:17 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @ashmit maybe you want to control high load with small pushbutton or low voltage


  • At 29 March 2013, 11:31:57 user ashmit wrote:   [reply @ ashmit]
    • why do we have to use the electromagnet to put the switch on and y cant we just make the contact with a simple switch.


  • At 20 March 2013, 15:32:40 user manoj raut wrote:   [reply @ manoj raut]
    • That is very good method of understanding of relay opertion .
      But ,can you explain how can we are use relay for fan control


  • At 19 March 2013, 8:47:06 user saheer wrote:   [reply @ saheer]
    • Very helpful explanation thank u so much.......


  • At 18 March 2013, 13:01:41 user Mnagesh wrote:   [reply @ Mnagesh]
    • Can you please explain me what is meant by the "Potential free relays".
      As i want to integrate my device with the SCADA system they asked me to provide signal to SCADA device for 5 sec( means i want to complete there circuit using a potential relay) with the help of potential relays only.
      Or can i use any kind of relay to complete there circuit.


  • At 18 March 2013, 9:42:24 user Anusha wrote:   [reply @ Anusha]
    • Thanks a lot :)


  • At 11 March 2013, 17:47:43 user kiran kumar wrote:   [reply @ kiran kumar]
    • An easy way to analyse


  • At 10 March 2013, 18:20:53 user kiran wrote:   [reply @ kiran]
    • really great!!!! this is so helpful....


  • At 7 March 2013, 19:56:21 user kimani morgan wrote:   [reply @ kimani morgan]
    • sent me more ok.!!!!!!!!!!!!!!


  • At 7 March 2013, 2:19:38 user thilanka wrote:   [reply @ thilanka]
    • nice and simple explanation understood very well thank you sir.


  • At 28 February 2013, 15:51:08 user Mystique wrote:   [reply @ Mystique]
    • thank u so much for the awesome explaination it really helped me alot


  • At 23 February 2013, 5:18:56 user sram wrote:   [reply @ sram]
    • super


  • At 22 February 2013, 11:25:15 user Jayapriya wrote:   [reply @ Jayapriya]
    • Nice explanation


  • At 20 February 2013, 14:37:17 user vijay patel wrote:   [reply @ vijay patel]
    • thanks for giving the article.
      sir pls give me how many types of relay available in market with images pls reply me as fast as possible.


  • At 22 January 2013, 11:18:00 user Amit Arora wrote:   [reply @ Amit Arora]
    • i dont think there is a better way to make some one understand the relay operation...thankyou very much it was very helpful


  • At 16 January 2013, 12:03:12 user sourajit wrote:   [reply @ sourajit]
    • We can easily understand how Relay Work to study the chapter.


  • At 29 December 2012, 6:50:04 user swamy wrote:   [reply @ swamy]
    • great explanation.which had given a good idea about it.i hope more component explanation from u...thanq


  • At 28 December 2012, 18:17:07 user suresh kotgire wrote:   [reply @ suresh kotgire]
    • good one,really explained in a simple language with a detailled diagram.


  • At 26 December 2012, 9:45:18 user Mangesh wrote:   [reply @ Mangesh]
    • gr8 explanation with the concept.....nicely understood....thanx


  • At 23 December 2012, 15:26:49 user Aaron Chen wrote:   [reply @ Aaron Chen]
    • your explanation really help me understand what is relay about, I want to unerstand it from long time ago, but I just can't find other source that can help me understand easily like this!


  • At 20 December 2012, 16:02:02 user virendra wrote:   [reply @ virendra]
    • very nice explanation of relay operation

      Thanks Dear


  • At 6 December 2012, 7:53:21 user Harish wrote:   [reply @ Harish]
    • excellent explanation. finally understood the principle behind relays, and now it appears so simple!! keep up the good work.


  • At 3 December 2012, 7:10:28 user Etaa wrote:   [reply @ Etaa]
    • i thank you my fine sir. that was truly a good explanation. that clear everything up. your explanation and diagrams, true genius


  • At 21 November 2012, 6:34:16 user karthik wrote:   [reply @ karthik]
    • super explanation


  • At 20 November 2012, 2:25:41 user Prabhakar Kumar wrote:   [reply @ Prabhakar Kumar]
    • You are amazing .Very clear explanation with illustrative example.
      Thank you and keep on it............


  • At 17 November 2012, 18:06:41 user saiden ayob wrote:   [reply @ saiden ayob]
    • very nice demo... Excellent....


  • At 2 November 2012, 8:52:31 user Sinith wrote:   [reply @ Sinith]
    • Marvelous work ||||


  • At 11 October 2012, 11:25:26 user Binomon Abraham wrote:   [reply @ Binomon Abraham]
    • Nice & simple explanation. Very good

      Bino


  • At 29 September 2012, 9:53:31 user Mohamad Hilman Bin Ismail wrote:   [reply @ Mohamad Hilman Bin Ismail]
    • thanx 4 your explanation,proud to be an engineer..
      no doubt to take this course


  • At 28 September 2012, 10:34:48 user aniket wrote:   [reply @ aniket]
    • super like...!!


  • At 28 September 2012, 1:25:37 user krishna wrote:   [reply @ krishna]
    • its simply so beautiful i never expected such a beautiful answer from internet


  • At 25 September 2012, 16:00:50 user siri wrote:   [reply @ siri]
    • thank u so much... very useful to understand basic concepts of my small project


  • At 25 September 2012, 11:02:50 user Bhagwati wrote:   [reply @ Bhagwati]
    • good for knowlede


  • At 16 September 2012, 14:37:35 user Ansari yasar wrote:   [reply @ Ansari yasar]
    • Its too benifitial


  • At 9 September 2012, 17:56:34 user ajit wrote:   [reply @ ajit]
    • its too good


  • At 22 August 2012, 22:08:49 user Abe kaate wrote:   [reply @ Abe kaate]
    • good lesson with simple illustrations


  • At 14 August 2012, 21:13:58 user hari rana wrote:   [reply @ hari rana]
    • really informative..very easy to understand.. thanks


  • At 1 August 2012, 13:38:39 user sarang wrote:   [reply @ sarang]
    • grt explanation...


  • At 29 July 2012, 12:21:42 user dayalraj wrote:   [reply @ dayalraj]
    • sir,
      i also want to know about "limit switch" and its operation


  • At 28 July 2012, 4:50:58 user jesu wrote:   [reply @ jesu]
    • super sir thank you a lot... need more from your side


  • At 26 July 2012, 7:17:32 user T.dayalraj wrote:   [reply @ T.dayalraj]
    • i am a lecturer in a polytechnic. Now i can explain this relay topic in such a easy way to the students. i trust that every student can understand this topic about relay.
      dayalraj


  • At 18 July 2012, 8:16:22 user shubham wrote:   [reply @ shubham]
    • Grate..........best tutorial of relays


  • At 3 July 2012, 8:13:46 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @Mohammad Nofal Yes you can do that,that is what they are designed for. The coil is completely isolated from the contacts


  • At 3 July 2012, 7:43:48 user Mohammad Nofal wrote:   [reply @ Mohammad Nofal]
    • can we use two loads in the same relay output, one in NO & 2nd one in NC, does the relay coil or sping affected after several times of activation.


  • At 25 June 2012, 12:25:55 user prasanna m r wrote:   [reply @ prasanna m r]
    • superb! solved all my confusions


  • At 7 June 2012, 9:08:16 user muhammad imran mehdi wrote:   [reply @ muhammad imran mehdi]
    • well done very nice description


  • At 28 May 2012, 14:21:06 user cabdikilaas wrote:   [reply @ cabdikilaas]
    • thank u very much so that these way is helpeful procces that can understand every one life over the world or use these technical


  • At 25 May 2012, 5:42:25 user Dhruv solanki wrote:   [reply @ Dhruv solanki]
    • yeeeee it's very good


  • At 22 May 2012, 6:08:12 user mangesh wrote:   [reply @ mangesh]
    • best tutorial of relays


  • At 26 April 2012, 14:22:58 user edresym wrote:   [reply @ edresym]
    • very nice discription


  • At 25 April 2012, 9:14:27 user rizwan iftikhar wrote:   [reply @ rizwan iftikhar]
    • so nice description sir ...... and please describe other electronic component like this one in detail and graphically.......


  • At 17 April 2012, 10:04:53 user vinay wrote:   [reply @ vinay]
    • u explained it very easily


  • At 15 April 2012, 16:53:55 user Sandeep wrote:   [reply @ Sandeep]
    • Very good post...... Thank u very much......


  • At 8 April 2012, 7:51:55 user Muhammad Nasir wrote:   [reply @ Muhammad Nasir]
    • very easy to understand and excellent step wise approach, thnx


  • At 1 April 2012, 6:43:01 user hari wrote:   [reply @ hari]
    • thanx it was good.......and its language.is easy.......


  • At 31 March 2012, 6:06:42 user A. Rafay Inayet wrote:   [reply @ A. Rafay Inayet]
    • The way of Explaining is excellent. It will be more helpful for beginners as well.


  • At 27 February 2012, 11:21:53 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @shahzad you will need to use a transformer to convert 220 to 12. google for "ac/ac transformer"


  • At 27 February 2012, 10:48:54 user shahzad wrote:   [reply @ shahzad]
    • how can i operate relay with 220v
      and how can i convert 220v into 12v bc for relay operate


  • At 8 February 2012, 12:04:43 user Lineo wrote:   [reply @ Lineo]
    • I would like to have theory of 110V DC monitoring relays.How does it work when it monitors that Voltage does not drop and if it does send an alarm?


  • At 23 January 2012, 9:48:14 user adithyan wrote:   [reply @ adithyan]
    • thank u friend..,it helped me alot....


  • At 15 January 2012, 9:31:58 user jyothirmai wrote:   [reply @ jyothirmai]
    • thank you for giving this information,it is easy to learn and nice explanation..........


  • At 7 December 2011, 15:12:48 user krishna wrote:   [reply @ krishna]
    • nice explanation Thank u very much


  • At 12 November 2011, 12:36:02 user Kammenos wrote:   [reply @ Kammenos]
    • @John Miller the latching relay


  • At 12 November 2011, 5:51:46 user zahid wrote:   [reply @ zahid]
    • really nice animation for understanding the basic concept of relay.


  • At 11 November 2011, 17:00:58 user John Miller wrote:   [reply @ John Miller]
    • What type relay DPDT will remain in either position without the coil energized.


  • At 8 November 2011, 16:45:31 user Rakesh Bhati wrote:   [reply @ Rakesh Bhati]
    • Animated working is really very helpful to understand the basic concept of any mechanism....thanks for making this website...,,,


  • At 26 October 2011, 11:51:48 user sujit wrote:   [reply @ sujit]
    • Really, Really......Thank u


  • At 26 October 2011, 9:14:15 user shreyas wrote:   [reply @ shreyas]
    • really good work...helped me a lot.


  • At 23 October 2011, 5:58:26 user Aniruddh wrote:   [reply @ Aniruddh]
    • Its a good presentation. I have understood a lots of things from this website...Keep it up....


  • At 12 October 2011, 10:09:48 user Ziyanal wrote:   [reply @ Ziyanal]
    • ya buddy, very nice....wish you would have been my teacher during my college days...thanks a lot


  • At 11 October 2011, 14:46:42 user hsb wrote:   [reply @ hsb]
    • excellent explanation !!! keep more coming
      thanx !!


  • At 20 September 2011, 12:02:52 user pavithra.s wrote:   [reply @ pavithra.s]
    • really i like this of explanation.if we are reading in book.we can,t understand fully.sometimes it will be confusing.if we read the operations of instruments on animation,it will be usefull.so you have a good sense.please continue this.


  • At 7 September 2011, 8:39:39 user sushil wrote:   [reply @ sushil]
    • Really nice explanation.One of the simplest explanations for understanding relays


  • At 3 September 2011, 10:15:12 user Prashant wrote:   [reply @ Prashant]
    • Very easy explanation,Thanks


  • At 26 August 2011, 13:55:02 user ram wrote:   [reply @ ram]
    • thank you for giving this information,it is easy to learn


  • At 26 July 2011, 3:30:35 user krish wrote:   [reply @ krish]
    • Thanks a lot. What an clear/ excellent explanation...


  • At 3 July 2011, 8:36:38 user ilavarasan wrote:   [reply @ ilavarasan]
    • this is the excellent explanation, thanks


  • At 22 February 2011, 12:21:15 user Rasmi Ranjan Nayak wrote:   [reply @ Rasmi Ranjan Nayak]
    • Hello,
      This is one of the best informative pictorial representation I have ever seen. The flow is very coherent.

      Thanks Buddy.... Keep it Upppppp


  • At 12 November 2010, 11:33:46 user Gangat Mohsin... wrote:   [reply @ Gangat Mohsin...]
    • Thank you for the serail flow for the process in detail......


  • At 28 June 2010, 19:01:31 user ravi wrote:   [reply @ ravi]
    • i like the way you discuss i really thankful that i got such a gud explanation. but i would like to request to discuss more on induction motor for industrial application.





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