What Is a Relay?

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Relays are switches that open and close circuits electromechanically or electronically. They control one electrical circuit by opening and closing contacts in another circuit. When a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized. In either case, applying electrical current to the contacts will change their state.

Relays are generally used to switch smaller currents in a control circuit and do not usually control power consuming devices except for small motors and Solenoids that draw low amps. Nonetheless, relays can "control" larger voltages and amperes by having an amplifying effect because a small voltage applied to a relay's coil can result in a large voltage being switched by the contacts.

Protective relays can prevent equipment damage by detecting electrical abnormalities, including overcurrent, undercurrent, overloads and reverse currents. In addition, relays are also widely used to switch starting coils, heating elements, pilot lights and audible alarms.

With respect to the usage, installation or assembly of any products described in this video, Galco Industrial Electronics, Inc., a Michigan corporation, encourages you to follow the requirements and/or guidelines of: i) the Occupational Safety and Health Act of 1970, Public Law 91-596, as amended, and all laws, rules and regulations implemented in relation thereto; ii) the National Electric Code®; and iii) NFPA 70E®. Any installation, assembly or work described in this video should be performed by a qualified licensed electrician.
LEGAL DISCLAIMER:
While we have made every attempt to ensure that the information provided is accurate and has been obtained from reliable sources, Galco is not responsible for any errors or omissions, or for the results obtained from the use of this information. All information is provided "as is", with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information, and without warranty of any kind, express or implied, including, but not limited to warrantees of performance, merchantability and fitness for a particular purpose. At all times you should defer to the instructions and safety guidelines issued by the manufacturer. In no event will Galco, its agents or employees thereof be liable to you or anyone else for any decision made or action taken in reliance on the information provided to you or for any consequential, special or similar damages, even if advised of the possibility of such damages.

[mopa]

Thank you so much for taking the time to make this video. Keep up the good work.
happy new years.

[lucianoteodoro]

Congratulations for Galco TV to explanation the principles of industrial electronics

[RealityMilitaryTV]

I absolutely love the visual aids, her excitement & the graphics! Way to go Galco! :)

[josedominguez]

I love Relays.
You can do anything with them.
Logical circuits.
Secuencial circuits.
Combinational circuits.
They are so nice!!!!

[patrickbryan]

Great video & very nice explanation

[medickdd]

wow education and beauty all in one. thank you Galco

[Blackronin]

Great stuff here for the up and coming apprentice like me!

[HardikRajyaguru]

nice explaination simple and clr good job

[petitenotification]

Thank you for the great video. Needed an introduction to relays as I was checking out binary counters in relation to computer evolution, you helped me tons. Hope you find constructive feedback among the many "constructive" comments about your physical appearance. I work in a field with very few girls and often find it boring and limiting to have so much unusable feedback about my physical appearance rather than my content. I hope you have a good team supporting you in your passion !

[productofgrace]

I love the way galco explains these things

[saleembasha]

I fell in love with her and relays too.

[jefferyduran]

Hello, does the Relay output the same power when actuated/closed as the input or power source?

[professorfidelcat]

hi I understand a relays with more than 4 points can be made to buzz like a motor..electromagnetic switching, can I know what frequency does it typically buzz or switch when wired to do just that

[Azeezlu]

She clearly loves to talk about relays.

[MarkEatsCherries]

I hate it when I start revising and I end up in the freezer! good vid

[mikelarue]

thank you for the great video. very informative. on a side note, that is a beautiful young woman. good choice.

[muhdiszaki]

hi, I would like to have control of 6-10kv relay using arduino. is there any product to recommend

[minhvu]

I have a question. What are the differences of glass relay and a non-transparent one?

[NOONE]

Thank you for explanning like i'm five, so a relay is like an automated switch that is open when the circuit is not passing thro, and closes when a circuit passes. I'm I right?

[charbelcharbel]

Pls circuit drawing for ants 3phase ... thanks