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Three-phase switch

2015-09-03 16:47  
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To simplify the following schematics and facilitate easy understanding of the principles involved, the following schematic substitution is used (Note the triac driver is of limited use at 3 f voltage levels).
Three-phase switch

The following are three-phase switches for low voltage. Higher currents can be obtained by using inverse parallel SCRs which would be triggered as shown.



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