In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

SCRs transmit in only one direction, so the output would be half-wave rectified. TRIACs transmit both directions and is likely what you want. In lighting applications, typically there is an additional control circuit which limits the turn on point to be a zero cross point of the AC line, this reduces EMF generation in the load line. The same holds true for non-lighting applications, but the control cicuit is most prevelant in lighting applications.

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