silicon controlled rectifier
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Related to silicon controlled rectifier: TRIAC
silicon controlled rectifier[′sil·ə·kən kən′trōld ′rek·tə‚fī·ər]
A semiconductor rectifier that can be controlled; it is a pnpn four-layer semiconductor device that normally acts as an open circuit, but switches rapidly to a conducting state when an appropriate gate signal is applied to the gate terminal. Abbreviated SCR. Also known as reverse-blocking triode thyristor.