Integrated Safe Torque off is different from an emergency stop (E-stop). Depending on the standards and requirements for a particular application, it might be possible to use STO as part of an E-stop system. However, its main purpose is to be used in a dedicated safety control arrangement, designed to prevent foreseeable hazards from occurring. This paper summarizes the main differences between STO and e-stops, the requirements under the standards, the advantages of safe torque off, as well as the role of STO in motor starters.