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ericnutsch asked Two SCR's instead of a Solid State Relay?
Solid state relays are expensive, yet SCRs are very cheap for the equivalent power rating. An SCR works just like a switch when configured without feedback. If I put two SCRs back to back with the output going opposite directions they will accommodate the full sinewave of the AC. Do electrical engineers ever do this? What is the benefit to forking over the cash for the solid state relay? Thanks for your help!
And got the following answer:
If you look inside an SSR, chances are, you will see just what you describe. Inside the SSR you will likely see a pair of commutating SCRs (two back-to-back SCRs in parallel, anode SCR1 to cathode SCR2 and anode SCR2 to cathode SCR1). The gate triggering to the SCRs is likely an opto triac. There are limits to dv/dt across a triac when they are turning off. Back to back SCRs do not share that problem. SCRs are also a bit more advantageous in an SSR, as heat can be also dissipated from two SCRs versus just one TRIAC.
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