Relays: Electromechanical vs Solid State

Electromechanical Relays: www.rspsupply....
First let’s start with electromechanical relays, or EMR. The first thing you should know about EMR’s is that they use physical moving parts within the relay to achieve the desired functionality. These moving parts include the contacts that switch between that normally open and normally closed stationary contacts in the relay. This movement is made possible by and electromagnet. When power is applied to this magnet, it will act on the movable contact causing the relay to switch. It is common to here the switching sound that is represented as a “clicking” noise. This audible noise can be helpful when determining the functionality of the relay.
Solid State Relays: www.rspsupply....
Now let’s talk about solid-state relays and some of the characteristics that make them up. A solid-state relay will use a low power electrical signal to generate an optical semiconductor signal, this then will transmit and energize an output signal. So, when this is activated, the input optical signal will act as the switch, then allowing a higher voltage signal to pass through the relays output components. The internal circuitry of a solid-state relay is far more complex than an EMR, but the one main take way you should remember is that, in a solid-state relay, there are no physical moving parts.
Now that we have a better understanding of what makes up each of these two types of relays, let’s now talk about some of the advantages and disadvantages of each. Hopefully this comparison can help you better determine which type of relay will be better suited for you specific application. First looking at EMR’s: because of their more simplistic design and functionality, they are often less intimidating to installers and operators. Also, because of this simple design, the cost of an EMR is quite a bit less than that of a solid-state relay. Another benefit of using a EMR is that fact that in many cases testing is easier because of the audile “clicking” noise that they make, and also, in many cases you can manually switch the contact depending on the relay, which can also offer a lot of convenience depending on the situation. Lastly, EMR’s are much more common, which makes finding replacement parts much easier. Some disadvantages to using an EMR would be that they can generate a significant amount of signal noise depending on the application. Also, the typically consume much more power then a solid-state relay, which over time can lead to more cost. Another point to consider is, they do not switch as fast as a solid-state relay, so in situations where switching speed is important, an EMR may not be the best option. Lastly, EMR’s an create potential arcing situations, so they are not suitable for areas that may have a high potential for combustion, such a class 1 div 11 environment.
Now let’s look at solid-state relays: some of the advantages in using this type of relay would include the fact that they generate very little “noise” during operation which can be very beneficial depending on the application. They also consume very littler power in comparison to EMR’s, which over time can save a lot of money. They are very shock and vibration resistant which can offer a level of reliability not seen in EMR’s. Also, there is no danger of generating a spark, so using them in more volatile environments is acceptable. Lastly, they have the ability to switch at a very rapid rate, must faster than an EMR.
In conclusion, depending the application and a variety of other factors… will larger dictate which relay is best for your specific needs. There are definitely no right or wrong answers as to which is best. They each offer advantages and disadvantages that will factor into which relay will work best for your scenario.
Other videos on relays: • Time Delay Relays Basics
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[@LBTennis]

This man never misses a single syllable.

[@好釋明志]

Makes much easier for non-English speaking audiences.

[@cricketerforu]

Great video. A suggestion would be to show where this component is installed in a circuit and power it up to do a live demo. That will really clear the concepts. I am in sales and a lot of times sales people can talk about the features of the product but when it comes to understanding the operation when these components are installed in a circuit, we dont have a clue.

[@grizzsimbol4441]

A wealth of practical knowledge in this channel, thank you.

[@frab88]

Some important tips about SSR are missing: - DC and AC loads usually require specific types of SSR's - SSR can provide some intelligent functionality like "zero-crossing" which is extremely useful when switching AC resistive loads (like a frifge lamp for example) - SSR might NOT be the best option when switching inductive loads - SSR do NOT provide galvanic isolation when switched off... when switching motors this usually means that an electro-mechanical contactor has to be wired in series with the SSR and the load

[@NevergoldMel]

That Phoenix Contact High Density Relay you're showing is not solid state at 2:27 you can see where it says Electromechanical on the side.

[@AztecWarrior69_69]

@Keto Fitness Tips DUDE what the F is wrong with you. Color coding is a manufacturer thing.

[@AztecWarrior69_69]

It not only says it but the schematic symbols on the side of the relay show a coil and a SPDT switch/contacts.

[@peterwan816]

doesn't SSR generate heat? BTW this is a really good video tho with tons of details. Thanks for making this video!

[@peterwan816]

honestly it is a really great video! Thanks for making these videos and sharing!

[@HandSolitude]

Both of the relays shown were electromechanical. Read the side of the relay at 2:27

[@VladiFx]

I'm just now working with relays, so thanks Josh, It helps. Finnaly it look like, ssr-s are better choice.

[@David-qo6rx]

It depends. They can fail closed.

[@givenmgivivi4606]

Helpful 💯

[@esamesam6312]

Dears RSP I like your video, it's really amazing & helpful. I am a mechatronics engineer and I like to be one of RSP members as a volunteer. Regards Essam

[@berkeliumk]

Low cost solid state relays tend to have high leakage current (up to several mA) when "off". Also, depending on the load current, they can dissipate a lot of heat (junction voltage drop).

[@fatemeostad2446]

Very good video

[@indianmarkets95]

Thanks sir I really like ur videos ... When I open the link of EMR rsp it took me to the solids state relays..

[@_stardust__]

But that phoenix contact relay is not a solid state relay, that is also an electromechanical relay.

[@michaelcostello6991]

Very educational

[@svitlanatyson936]

The green relay with white top is electromechanical one:) not the solid state relay.

[@joem9124]

I think that's just the base but the actual relay module that clips in is SS

[@thussong6090]

Thank you for good video!

[@indianmarkets95]

Do they both look the same??

[@krhth21]

Very usefull sir. thx

[@manishshukla7262]

nice

[@saeedmsv5442]

GREAT

[@explorer__7321]

Explain it with simple circuits

[@AztecWarrior69_69]

2:27 is not an SSR.

[@memoriespast1499]

Transistors ;)