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abb automation electrical components are a new type of contactless switching device composed entirely of solid-state electronic components. They utilize the switching characteristics of electronic components (such as switching transistors, triacs, and other semiconductor devices) to achieve contactless, spark-free circuit connection and disconnection, hence they are also known as "contactless switches." A solid-state relay is a four-terminal active device, with two terminals serving as input control terminals and the other two as output controlled terminals. It provides both amplification drive and isolation functions, making it well-suited for driving high-power switching actuators.