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What are the functions of thermal protectors
 May 22, 2023|View:714

A thermal protector is a sensor used to protect circuits or equipment from abnormal conditions such as overload, overheating, and short circuits. It is usually composed of one or more thermal resistors or thermistors, which can detect temperature changes to determine whether the circuit or equipment is in an overheated or overloaded state, and automatically cut off the power supply if necessary to protect the circuit or equipment from damage. So what are the functions of the thermal protectors here? Let the manufacturer of the thermal protector provide us with a detailed introduction!


A thermal protector is a sensor used to protect circuits or equipment from abnormal conditions such as overload, overheating, and short circuits. Its main functions include:


Protection circuit: The thermal protector can detect the heating components in the circuit, and automatically cut off the power supply when the circuit overheats, thereby protecting the circuit from damage.


Protection equipment: The thermal protector can detect the heating condition of the equipment, and automatically cut off the power supply when the equipment overheats, thereby protecting the equipment from damage.


Overheat protection: The thermal protector can detect the ambient temperature and automatically cut off the power supply when the ambient temperature exceeds the set value, thereby protecting the equipment from overheating damage.


Overload protection: The thermal protector can detect the current in the circuit and automatically cut off the power supply when an overload occurs, thereby protecting the circuit from overload damage.

thermal protector

Short circuit protection: A thermal protector can detect short circuits in a circuit and automatically cut off the power supply when a short circuit occurs, thereby protecting the equipment from damage caused by short circuits.


The main working principle of a thermal protector is to utilize the thermal conductivity characteristics of thermistors or thermoelectric resistors. When the internal temperature of a circuit or device increases, the temperature of the thermal protector also increases, leading to changes in its resistance value. The circuit inside the thermal protector can automatically detect the overheating of the circuit or equipment by amplifying and processing the changes in resistance value, and automatically cut off the power supply when the overheating reaches a preset threshold, thereby protecting the circuit or equipment from damage.


Thermal protectors are widely used in fields such as electronics, electrical appliances, motors, automobiles, and aviation to prevent damage caused by abnormal conditions such as overheating, overload, and short circuits in circuits or equipment.


Ainuo Electronic is a manufacturer of thermal protectors, and we have many years of experience in producing and selling thermal protectors. At present, the thermal protectors we produce are not only of good quality but also of low price. If needed, welcome to consult!