Safety relays are designed to reliably monitor signals from safety devices and switch off quickly in emergency situations. The safety relay has a built-in self-monitoring function, that is, if the contacts are welded or stuck, the safety control relay will automatically open the circuit contacts on the input and output sides. This happens because the correct opening and closing of these relays are tested automatically inside it in each on-off cycle. This ensures that the safety function works even in case of its internal components failure. The safe function is guaranteed by specific internal circuits and relay technology.