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What is a safety relay?

Safety relay is a module composed of multiple relays and logic circuits. It is a kind of circuit composition unit. Its purpose is to complement each other's defects in fault state, so as to achieve the function of correct and low misoperation, reduce its error and failure value, and improve safety factors. To be complete, it should be called safety relay module.
At present, the name of safety relay in China is not very unified. Some are directly called safety controller, and some are simply called relay. 
Due to different mechanical equipment and different process links, there are different safety risks and different risk levels. Therefore, in the product design, a variety of safety relays are designed to protect different levels of mechanical equipment, mainly to protect mechanical operators exposed to different levels of risk.