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Customizable fan thermal protector | Haichuan temperature control switch

The selection of normally open or normally closed type of thermal protector needs to be determined according to the specific application scenarios and functions to be realized. Haichuan can customize the fan thermal protector according to customer needs.


August 04, 2023

The reason why fans are installed on many products is to provide additional heat dissipation and maintain stable operation of the device.


The main reasons are: 

Heat dissipation: The fan can blow the surrounding air into the device by forcing convection to accelerate heat transmission and distribution. Especially for high power or long time running equipment, the fan can effectively reduce the operating temperature of the equipment and prevent the damage caused by overheating.


Improve performance: the performance of some equipment may decrease in high temperature environment, such as the working frequency of electronic components, the speed of the motor, etc. By installing fans, the operating temperature of the equipment can be reduced to provide better heat dissipation effect, thus keeping the equipment within the appropriate operating temperature range and improving the performance and reliability.


Extend life: too high temperature will cause damage to the parts and insulation materials inside the motor, and reduce the life of the motor. The use of fan can effectively reduce the working temperature of the motor, reduce the thermal stress of parts, and prolong the service life of products.

thermal protector

Many customers don't know how to choose the right thermal protector?


The selection of normally open or normally closed type of thermal protector needs to be determined according to the specific application scenarios and functions to be realized. When making a selection, consider the following factors:


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


Characteristics of the motor and the system: consider the impact of the start and stop of the fan inside the motor on the system, and the protection requirements of the motor itself.


Safety and reliability requirements: Select the proper thermal protector type according to the safety and reliability requirements of the application.


Operating characteristics of normally open and closed thermal protector:


Normally open type of thermal protector, under normal working conditions, the contact is in the open state, when the temperature exceeds the set value, the contact closes, cut off the circuit, stop the fan inside the motor. This type of thermal protector is suitable for applications that need to stop the motor internal fan immediately when the temperature exceeds a certain threshold.


For the normally closed type of thermal protector, under normal operating conditions, the contact is in a closed state. When the temperature exceeds the set value, the contact opens, cuts off the circuit, and stops the operation of the internal fan of the motor. This type of thermal protector is suitable for applications that require fans inside the motor immediately when the temperature exceeds a certain threshold.


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