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The optocoupler is a device that can transmit electric signal by using the light as a medium. The input terminal and output terminal are completely electrically isolated by the Isolated Coupling Circuit. When the input electrical signal reaches the input terminal of the optocoupler, an optical signal will be generated, and then be converted into an output electrical signal by Optical Sensor of the output terminal to the load circuit. According to the type of the Optical Sensor, the optical coupler can be divided into Phototransistor Coupler, Phototriac Coupler, and etc.