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The low voltage ac voltage ( S1 of T ) is appliedto the pair of two SCRs, CR1 and CR2,connected antiparallel with in series RL. Theseare the main SCRs. As the SCR is being commutated at the crossover points of ac cycle, but then it becomes a simple phase control circuit. To commutate them earlier at required time two auxiliary SCRs, CR3 and CR4 are used.