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S01 150℃ Coil Thermal Protector

S01 Button type is snap action and bimetallic thermostat, Bimetal trips off or on quickly to open or close the circuit when temperature reaches the prescribed value.

Product Details:


A coil thermal protector, also known as a thermal cutoff or thermal fuse, is a protective device used in electrical appliances and equipment to prevent overheating and potential fires. It is designed to interrupt the electrical circuit when the temperature exceeds a specific threshold.

The coil thermal protector consists of a small metal or ceramic housing that contains a temperature-sensitive fuse element. The fuse element is typically made of a low melting point alloy or a bi-metallic strip. When the ambient temperature reaches a critical level, the fuse element rapidly heats up and triggers a mechanical action that disconnects the electrical contacts, thereby cutting off the power supply to the device.

The coil thermal protector is commonly used in various applications where temperature control and safety are crucial, such as electric motors, transformers, solenoids, heating elements, and other components that generate heat during operation. It provides an additional layer of protection by acting as a failsafe mechanism to prevent excessive temperature buildup and potential damage.

It’s important to note that once a thermal protector has been activated due to overheating, it typically needs to be replaced since it permanently interrupts the electrical circuit. This ensures that the device cannot be restarted without addressing the underlying cause of overheating and potential damage.

Here are a few additional details about coil thermal protectors:

  1. Temperature Ratings: Coil thermal protectors are available in various temperature ratings to suit different applications. The temperature rating indicates the maximum temperature at which the thermal protector will activate and disconnect the circuit. For example, a thermal protector with a temperature rating of 150℃ will trip when the temperature exceeds 150℃.
  2. Resettable vs. Non-resettable: Coil thermal protectors are generally available in two types: resettable and non-resettable. Non-resettable thermal protectors are designed to permanently open the circuit once they trip. They need to be replaced to restore normal operation. Resettable thermal protectors, on the other hand, can be manually reset after they cool down. They automatically restore the electrical connection once the temperature drops below the threshold.
  3. Installation: Coil thermal protectors are typically installed in series with the circuit they are intended to protect. They are connected in line with the power supply, usually near the heat-generating component. This positioning ensures that the thermal protector can monitor the temperature of the device or component accurately.
  4. Safety and Compliance: Coil thermal protectors play a critical role in ensuring the safety and reliability of electrical appliances and equipment. They are often required by industry standards and regulations to prevent overheating and fire hazards. Manufacturers must adhere to specific safety guidelines and standards when incorporating thermal protectors into their products.
  5. Application Considerations: When selecting a coil thermal protector, it’s essential to consider factors such as the operating temperature range of the device, the current rating of the thermal protector, and the response time required for protection. Proper sizing and installation of the thermal protector are crucial to ensure effective temperature control and prevent damage to the equipment.

Overall, coil thermal protectors are essential components in electrical systems, providing an important safety feature by disconnecting the power supply in case of excessive temperature rise. Their ability to prevent overheating and potential damage makes them critical for protecting both the equipment and ensuring user safety.

Special Features

* Small size and easy for mounting;

* Low current sensitivity, no large temperature difference due to over current;

* Precise temperature control.

Electrical Specifications

250V AC : 3A

125V AC : 6A

24V DC: 6A

Contact Resistance: <30mΩ

Dielectric Strength: 2KV

Technical Parameters


Operating Temperature 60~220℃, A specification for each 5℃
Operating Temperature Tolerance ±5℃
Reset Temperature Less than 1/3 of operating temperature
Reset Temperature Tolerance ±15℃





Curtain Motor

Washing Machine Motor




TUV:R 50383352 0001


Dimensional Drawings



Series Application





1. What would happen if the working current exceeds the rated value of a thermal switch?

When the end users operate the appliances, the working current might exceed the rated value. If so, what would happen to the bimetallic thermal switch? There are some possible results:

1. The thermal switch would trip off earlier than the rated temperature. The reason is that the bigger current would generate more heat, and the bimetal would sense higher temperature than the rated value. So, it would trip off earlier.

2. The life endurance would be shorter. Bigger current would hurt both bimetal and contacts. There would be flashover between two contacts. If the current is too big, for example, 3 or 4 times of rated value, the two contacts would be stuck and could not open. That would make thermal switch malfunction, or even cause fire.

3. The thermal switch failed to action in few seconds and even burned the insulation sleeving

Therefore, it is very important for the user to operate the thermal switch correctly and try to avoid overloading the thermal switch.

2. What qaulity assurance system do you use in your factory to ensure the thermal switch quality?

1. To ensure the quality consistence of our bimetal thermal switch, we got ISO9001:2008 version certification and fulfill the system strictly. In 2012, we started to implement TS16949 system to meet the demands of automotive cusotmers.

2. The life endurance we guaranteed is based on the working enviroment and rating. Different thermal switch has different level, like 10,000 cycles, 30,000 cycles or 100,000 cycles.

3. The defective rate of our thermal switch that we promise to our customer is 100 ppm.

3. What is the warranty period of your thermal protector?

The warranty period of thermal protector we promised is not a specific time, like how many days, months or years, but the action cycles of thermal protector. Normally the life cycles ranges from 10,000 cycles to 100,000 cycles according to different models and working capacity. It is one of the most important parameters of thermal protectors. Customers can find it in the specification of different models.

The life cycles we mentioned here are only for working under rated current and voltage. If the working condition changed, the final life endurance would be also different.




Contact Information

Company Name: Yangzhou Wuyue Electric Co.,Ltd

Address:Building D, Software Information Industrial Park, No.2 Huaijiang Avenue, Baoying County, Jiangsu Province, China

Contact: Lorena Qiao

Mobile: +86 153 6641 6606 / 189 2191 2633

Tel: +86 514 88986588

Fax:+86 514 8898 6599