Here I'll introduce programmable logic controller (PLC) input circuits using opto-couplers. I'll also discuss the concepts of SOURCE and. From relay sockets to pluggable relay and optocoupler modules – WAGO delivers versatile, high-performance solutions for every application. Our sockets. Optocouplers (also called Photocouplers, Optoisolators, and Optical Isolators) are available at Mouser Electronics from industry leading manufacturers. 6V–30V What Is an Optocoupler and Why Use One? 💡 What Is an Optocoupler and Why Use One? An optocoupler (also called an opto-isolator or photocoupler) is a component that transfers an electrical signal. Optocouplers, also known as opto-isolators, uses infrared light to transfer electrical signals between two electrically isolated circuits and are commonly classified by their photosensitive output device What is an Optocoupler? An optocoupler (also called an opto-isolator, photo-coupler, or optical. An optocoupler, also known as photocoupler or opto-isolator, is a device which can transfer an electrical signal across two galvanically-isolated circuits by way of optical coupling. Unlike transformers or capacitors, which can only transfer AC signals across the isolation barrier, optocouplers can.