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SCR stands for "Silicon Controlled Rectifier." It is a semiconductor device, also known as a thyristor, that is widely used in electronics and electrical circuits. An SCR is a three-layer semiconductor device with a gate terminal that controls the flow of electric current between its anode and cathode.
The primary function of an SCR is to act as a switch for high-power electrical loads. It allows current to flow in one direction only (from anode to cathode) and can be triggered to conduct by applying a small control voltage to its gate terminal. Once triggered, it remains conducting until the current flowing through it drops below a certain threshold.
SCRs are commonly used in applications such as power control, motor control, voltage regulation, and in various types of electronic circuits where precise control of high-power devices is necessary. They are known for their reliability and efficiency in controlling large electrical loads.