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When is a TRIAC more appropriate to use than an SSR when controlling mains?

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crazy_steve

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Hi all,

I hope this question is not too broad to answer...

I was wondering when an optically isolated TRIAC circuit setup would be more appropriate to use vs. an SSR for controlling devices running off mains.

If the the triac circuit is a zero-crossing setup, then I can't think of a scenario where the ssr would be a poorer choice.

If the triac circuit is random-crossing then I can see that it could be useful in light dimming applications were the SSR would be pretty useless :D

Am I overlooking something? Perhaps something with quick toggling on/off and lifespan?
 

If you are more familer to triac please give me some circuit and web link .I want to know more about triac please help me dear
 

As far as I know, the power device in most SSRs is a TRIAC. So, same as a TRIAC, a SSR can be triggered anywhere in the wave, but you have to wait until current reduces to zero in order to achieve turn off.
The main reason for using a SSR instead of a TRIAC (which is cheaper) is when you need to isolate the control circuit from the load. In fact, the SSR has built-in optical isolation. And some of them include added circuitry to delay turn-ON until the next zero voltage crossing (synchronous SSR).
More on this: www.omega.com/temperature/z/pdf/z124-127.pdf
Is this what you needed?.
 
Yep, that answers that. I was under the impression an ssr did not contain triacs.. that they used two scrs along with some other magic which could cause them to have different properties. Thank you
 

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