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Bronze 20th December 2002 08:05 PM

What is a solid state relay?
 
A relay to me is a purely mechanical device. Is this another name for an SCR?

jserrano 20th December 2002 09:17 PM

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

Brian Brown 20th December 2002 11:10 PM

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.:cubist:

Nelson Pass 20th December 2002 11:36 PM

Also, don't even Think of sending an audio signal through one.

Brian Brown 21st December 2002 02:57 AM

Quote:

Originally posted by Nelson Pass
Also, don't even Think of sending an audio signal through one.
Yikes!:yikes:

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

But now you've got me thinking about it.:boggled:

Havoc 21st December 2002 07:00 PM

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.

peranders 21st December 2002 07:48 PM

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....:hypno1:


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