An overheat protector (also known as a temperature switch or thermal protector) is a safety device used to prevent equipment from being damaged due to overheating. It is widely applied in fields such as motors, household appliances, and industrial equipment. The following is a detailed introduction to its main application fields and functions:
1. Main functions
Temperature monitoring and protection: When the equipment temperature exceeds the set threshold, the circuit is automatically cut off to prevent overheating and damage.
Overcurrent protection: Some models (such as KI6A, 2AM series) also have current overload protection function, which can quickly disconnect the circuit when the motor is locked or the current is abnormal.
Automatic/Manual reset
Automatic reset type: Power is automatically restored after the temperature drops (such as ST22, 17AM series).
Manual reset type: Requires manual intervention to restart (such as 6AP1+PTC protector), suitable for scenarios with higher safety requirements.
Dual protection mechanism: Some protectors (such as KLIXON 8CM) respond to both temperature and current changes simultaneously, providing more comprehensive protection.
2. Main application fields
(1) Motors and industrial equipment
All types of motors (AC/DC motors, water pumps, air compressors, etc.) : Prevent winding overheating or blockage damage (such as BWA1D, KI6A series).
Electric tools (such as electric drills and cutters) : Avoid motor burnout caused by high-load operation.
Industrial machinery (punch presses, machine tools, etc.) : Three-phase motor protection, supporting phase loss and overload protection.
(2) Household appliances
Electric heating equipment (electric water heaters, ovens, electric irons) : Prevent dry burning or temperature out of control (such as KSD309U high-temperature protector).
Small household appliances (coffee machines, electric fans) : Automatic power-off protection (such as bimetallic strip temperature switches).
Air conditioners and refrigerators: Compressor overheat protection.
(3) Electronic and lighting equipment
Transformers and ballasts: To prevent overload or poor heat dissipation (such as 17AM series).
LED lamps: Prevent fires caused by overheating of the driving circuit.
Battery and charger: Monitor charging temperature to prevent battery thermal runaway.
(4) Automotive electronics
Window motor, wiper motor: To prevent locked rotor or overheating during prolonged operation (such as 6AP1 protector).
Electric vehicle charging system: Ensure temperature safety during the charging process.
3. Key parameter selection
Operating temperature: The common range is 50°C to 180° C. The selection should be based on the equipment requirements (for example, electric water heaters commonly use 100°C to 150°C).
Current/Voltage specification: such as 5A/250V or 30A/125V, it needs to match the load.
Reset methods: Automatic reset is suitable for continuously operating equipment, while manual reset is used in high-security scenarios.
The selection of overheat protectors should comprehensively consider the temperature range, electrical parameters, installation methods and environmental requirements to ensure the safe and reliable operation of the equipment
Post time: Aug-08-2025