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Thermal Protector Selection Strategy on Custom Fans | Haichaun

The choice of a normally open or normally closed thermal protector needs to be determined based on the specific application scenario and the functions that need to be implemented.

October 25, 2023
Thermal Protector Selection Strategy on Custom Fans | Haichaun

The reason why fans are installed on many products is to provide additional cooling effect and maintain stable operation of the equipment.


The main reasons are as follows:

Heat dissipation: The fan can blow the surrounding air into the interior of the device through forced convection, speeding up the transmission and dissipation of heat. Especially for high-power or long-running equipment, fans can effectively reduce the operating temperature of the equipment and prevent damage caused by overheating.


Improve performance: The performance of some equipment may decrease in high-temperature environments, such as the operating frequency of electronic components decreasing, the speed of the motor decreasing, etc. By installing a fan, you can lower the operating temperature of the device and provide better heat dissipation, thereby keeping the device within the appropriate operating temperature range and improving performance and reliability.


Extended life: Excessive temperature will cause damage to the internal parts and insulation materials of the motor, reducing the life of the motor. The use of fans can effectively reduce the operating temperature of the motor, reduce the thermal stress of parts, and extend the service life of the product.

Many customers don’t know how to choose a suitable thermal protector?


The choice of a normally open or normally closed thermal protector needs to be determined based on the specific application scenario and the functions that need to be implemented. When making your choice, consider the following factors:


Temperature control strategy: Based on the requirements of the application, determine whether to stop the fan operation immediately after reaching a certain temperature or start the fan operation immediately after reaching a certain temperature.


Characteristics of the motor and system: Consider the impact of starting and stopping the fan inside the motor on the system, as well as the need for protection of the motor itself.


Safety and reliability requirements: Select the appropriate thermal protector type based on the safety and reliability requirements of the application.


Normally open and normally closed thermal protector operating characteristics:

For a normally open thermal protector, under normal operating conditions, the contacts are in an open state. When the temperature exceeds the set value, the contacts close, cutting off the circuit, and stopping the operation of the fan inside the motor. This type of thermal protector is suitable for applications where the fan inside the motor needs to be stopped immediately when the temperature exceeds a certain threshold.


For a normally closed thermal protector, under normal operating conditions, the contacts are in a closed state. When the temperature exceeds the set value, the contacts open, cutting off the circuit, and stopping the operation of the fan inside the motor. This type of thermal protector is suitable for applications where the motor's internal fan needs to be activated immediately when the temperature exceeds a certain threshold.


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