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Old 20th December 2002, 08:05 PM   #1
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Default What is a solid state relay?

A relay to me is a purely mechanical device. Is this another name for an SCR?
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Old 20th December 2002, 09:17 PM   #2
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The solid state relay (SSR) is the electronic equivalent of the electromechanical type.

Take a look at this picture and it will seem clearer.

http://www.ifirobotics.com/images/ssr_600w.gif
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Old 20th December 2002, 11:10 PM   #3
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Default Re: What is a solid state relay?

Quote:
Originally posted by Bronze
A relay to me is a purely mechanical device. Is this another name for an SCR?
A solid state relay is a pre-packaged electronic module that can take the place of a traditional mechanical relay.

Typically the input feeds an optocoupler which, depending on the load, controls a Triac, SCRs, MOSFET, or IGBT. Sometimes there's extra circuitry to handle transient suppression.

Note that solid state relays are for AC or DC, but not both.

Brian.
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Old 20th December 2002, 11:36 PM   #4
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Also, don't even Think of sending an audio signal through one.
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Old 21st December 2002, 02:57 AM   #5
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Quote:
Originally posted by Nelson Pass
Also, don't even Think of sending an audio signal through one.
Yikes!

It never even occured to me that somebody might want to try that!

But now you've got me thinking about it.
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Old 21st December 2002, 07:00 PM   #6
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There are some small opto-coupled SSR's that can be used for audio. You do not use a 10A relay for audio do you?

Something to consider when using them: they do not provide galvanic separation like "real" relays do. You always have a leakage.
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Old 21st December 2002, 07:48 PM   #7
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Quote:
Originally posted by Nelson Pass
Also, don't even Think of sending an audio signal through one.
Nelson, this is not so crazy as you think. I'm not totally sure but I have a vague memory of a solid state relay with double MOSFET's. But still it's pretty crazy....
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