Relays and Contactors - How Do They Work and What is the Difference 

Glad it was helpful!

Exactly. No one needs all that graphical information we just need to see it for what it is in the physical world lol then we'll be able to understand it graphical

Glad you enjoyed it! Thank you for your kind words Nigel.

Good to hear!

Glad to hear it!

Thank you!

Glad you liked it Kenneth!

Great to hear Kendall!

TW Controls has the best knowledge I seen in years. I never took his course because too far away from long island but do recommend it.

Thank you!

You are welcome. Thank you for your kind comments.

Thanks 🔥

Hi Edmond. We have some safety videos coming that will hit the basics of this. Thanks for watching!

Thanks

Do you mean something such as this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-5p3BjA-K0T4.html

Factors

I can do that. I'll put it on the list. Thank you for the suggestion Sandeep!

@@TimWilborne where can we connect neutral on 3 pole magnetic forward and reverse contactor

Typically you just need to make sure it states that it has a horsepower rating higher than your motor. Many "relays" have low horsepower ratings despite having a high amperage rating.

@@TimWilborne Thanks, Tim. I learned how to wire a PLC thanks to you by the way. Regards.

You are welcome Hetan

Hi Alex, what would you envision it having?

Hi Gary. In some cases, 24V coils can be used with AC and DC but for the most part 24VDC coils are larger. My advice is if doesn't say 24VDC, swap it out.

Probably not. Clint does a good job of explaining why in this video. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ctYLmzhBU_Y.html

@@TimWilborne Thanks Tim, but I still don't understand the vast difference in AC and DC ratings. The relay I mentioned above is rated 250VAC ~/ 28VDC 10A. Why such a difference? Volts are volts, right? Thanks

@@KW-ei3pi No, volts are not volts...there lies the problem. AC is a SINE wave which mean it crosses 0V 60 times a second (60Hz) or roughly every 16 to 17 milliseconds. DC is constant. When you try to open a relay contact, you will produce an arc. AC sees that arc for a maximum of 16 to 17 ms. DC will see that arc until the relay contact moves far enough away to break the arc. That is why is is common to see AC voltage ratings 10 times higher than DC ratings and even then the amperage rating may not be the same. If I have to switch a DC load in one of my panels, I usually will select a solid state relay. Here is another video Clint did that may help with those. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NpFEQ6qF1JE.html

@@TimWilborne Awesome. Thanks! I will probably see if I can find a Contactor that will work. But shopping for one has so far been difficult. Thanks again.

@@TimWilborne One more question, Tim. The circuit has a Potentiometer. It's normally set to a very low speed before the DC motor is started. It's connected to the S1, S2, and S3 terminals of the Motor Controller. Does that limit the voltage to the motor and thus reduce the risk of damage to the contacts of the relay or contactor? Thanks

No you just need some basic troubleshooting tools but becoming a certified electrician is a great goal to shoot for.

Not at all. I been doing for over 30 yrs including building electrical troubleshooting. Getting qualified as a controls technician is a great addition. I'm working on it now. Next year I'm becoming a full contractor. Lots of east coast travel.

Yes it exist. Was that your question Mike?

Yes, one letter can make a major difference!

😁