The thermal protection system referred to in this section is based on the principle of monitoring the temperature of the protected components, and is a simple and effective measure to prevent excessive temperature rise caused by cooling system faults or high environmental temperature of rotating motors. Conversely, relying solely on monitoring current protection systems cannot ensure this type of protection. Due to the predetermined operating temperature and response time of the thermal protection system, it cannot be adjusted according to the corresponding motor usage conditions. Therefore, for all fault states or improper use of the motor, its protective effect may not be fully effective. A thermal protection system that complies with this section can consist of a characteristic changing thermal detector with relevant control units that can be transformed into a switching function at a certain point in the detector's characteristics. Thermal protection systems are widely used, and in all cases, motor manufacturers install detectors in the motor. Motor manufacturers either provide control units with the motor or specify specific requirements for the control units used. The control unit is also traditionally regarded as an integral part of the control system and does not need to be supplied with the motor. Therefore, it is necessary to have an interchangeable system that specifies the coordination characteristics between the detector and the control unit. It cannot be considered that this specific system is superior to other systems that comply with this section, but in certain fields, this interchangeable system may be used and represented by "Type A"
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