Link to purchase the Electrical Calculations Spreadsheet: https://hotm.art/ytd-planilha-calculo... Link to purchase the Load Panel Calculation Spreadsheet: https://hotm.art/ytd-planilha-quadro-... Link to purchase the Electrical Plant Sizing Spreadsheet: https://hotm.art/ytd-planilha-plantas... __________________________________________________ If you like the Eletricity channel and want to contribute to the generation of quality content, then access one of the options below: PIX KEY ???? [email protected] QR CODE ???? https://bit.ly/doacao-pix __________________________________________________ Receive Eletricity content straight to your email! Sign up using the link below: ???? https://bit.ly/cadastro-eletricity ___________________________________________ Download the diagrams presented in the video, print them and take notes to improve your learning. ???? Link to download the material https://bit.ly/diagrama-rele-termico __________________________________________________ ???? Check out our content ???? ???? https://linktr.ee/Eletricity __________________________________________________ “OVERLOAD RELAY - SO WELL KNOWN, BUT OFTEN MISNESS UNDERSTOOD”. The overload relay, also known as a thermal relay, is well known by electricians and electrical professionals, but sometimes there are still doubts about the correct operation of this device. So let's understand a little more about how the thermal relay works. Did you know that it does not have internal sectioning of the 3 phases? That's right, the thermal relay has dry contacts that only serve as signaling and activation of an auxiliary device that can be a contactor. This auxiliary device is what will open and section the 3 phases. Another important feature is that the thermal relay has an actuation curve. It does not trip instantly as soon as an overload occurs, there is a time for this trip. The tripping time occurs because it senses the overload through the deformation of a bimetallic material (the higher the current, the greater the deformation of this material). When this bimetallic material is deformed, it activates an internal handle of the overload relay that opens the NC contacts and closes the NO contacts. The curve of a thermal relay has some similarity to the curves of circuit breakers. It is important to observe the thermal relay's actuation curve to ensure that it will operate in a time that is not sufficient to damage the load. It is not possible to speak specifically about a thermal relay model because there are a huge number of models and types on the market, so let's basically talk about the functions that practically all of them have: 1) Automatic activation option - The relay trips in case of overload and resets itself without the need for manual resetting; 2) Manual reset option - The operator needs to locally activate the overload relay after it trips; 3) Trip signaling option - A NO or NC contact can be used for remote signaling of relay tripping through a light signal or applications in PLCs, etc. 4) Option to adjust the tripping current; 5) Trip signaling on top of the relay; 6) Test button. It is always ideal to use an overload relay model with a contactor model indicated for use with it. Normally, an overload relay and contactor from the same manufacturer are used because they are made to be perfectly coupled. There are professionals who can use an overload relay from one manufacturer with a contactor from another manufacturer, but always be careful to check if the coupling is perfect. Thank you for watching our video and I hope you enjoyed it. See you next time. ???? Stay tuned to #electricity ???? __________________________________________________ ???? Most Watched Videos: What THEY DIDN'T TELL YOU about the 3-PIN SOCKET CONTROVERSY. ???? https://bit.ly/2JE4P07 How to Make a Curve and Unevenness in Electrical Conduit. ???? https://bit.ly/2ABlrk4 Higher Voltage Lower Current, Truth or Myth? We Prove It For You (Part 01). ???? https://bit.ly/2xvtzRB Do You Know All the Functions of the Wire Stripping Pliers? ???? https://bit.ly/2GD5Sun What is Best for Shunting in Electrical Panels? We Tested It For You, See the Result. ???? https://bit.ly/2MDdrHl We Connected 3 Lamps in a Star without Neutral. Does It Work? The Result is Impressive. ???? https://bit.ly/2BzUkH1 We Tested the WAGO 221 Connector and the Result Was Incredible. ???? https://bit.ly/2PknMoz Insulator Test. ???? https://bit.ly/2wEYcDV Connection Test. ???? https://bit.ly/2MHQdzZ_ Do you know about threaded rivets? Do you know how to use them? ???? https://bit.ly/2J8bSMC We tested the Porcelain Connector. ???? https://bit.ly/2AddKRh