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The safety barrier is connected between intrinsically safe circuits and non-intrinsically safe circuits. A device that limits the voltage and current supplied to intrinsically safe circuits within a certain safe range. The main function of the safety barrier is to limit current and voltage, ensuring that the energy available to the field instruments remains within safe limits. The safety barrier adds an “explosion-proof” function to the isolator, restricting the energy that can enter the hazardous area from the intrinsically safe terminals, thereby ensuring the intrinsically safe and explosion-proof nature of the system. Safety barriers are primarily used for explosion protection; they add explosion-proof functionality on top of that of signal isolators ； Safety barriers must be installed and used in various industrial settings where frictional electric sparks, static electricity sparks, high temperatures, as well as flammable and explosive gases, dusts, and vapors are present. On the one hand, it ensures the transmission of signals; on the other hand, it safeguards the safety of lower-level circuits, preventing greater losses as a result of minor issues. The main difference between an isolator and an isolated safety barrier is the “explosion-proof function”; the isolated safety barrier incorporates this explosion-proof feature on top of what an isolator provides. Isolator: Used to adjust and isolate various signals from field instruments, and convert them into standard signals that can be accepted by computers, DCS systems, PLCs, or other special signals specified by the user. A device used to electrically isolate remote control devices from operating devices; isolated safety barrier: a device associated with intrinsically safe explosion-proof instruments, which does not affect the functionality of the measurement system under normal conditions. It is installed on one side of a safe area; in the event of a failure in the intrinsically safe explosion-proof system, it can keep the energy (electrical energy) that might enter the dangerous area within safe limits, thereby ensuring safety in production. Therefore, the essential difference lies in whether it has an explosion-proof function or not.