Detailed explanation of thermal fuse types, key components to ensure equipment safety

With the widespread use of electronic equipment and electrical appliances, thermal fuses, as an important safety protection component, play an irreplaceable role. The thermal fuse can quickly disconnect the circuit when the device temperature exceeds the set value, thereby preventing the device from overheating and causing fire or damage. This article will comprehensively introduce the types of thermal fuses to help you better understand and choose a suitable thermal fuse.

The traditional thermal fuse is the most common type, usually using metal alloy as the temperature sensing element. When the temperature reaches a certain threshold, the alloy melts, cutting off the circuit. This kind of fuse has a simple structure and low cost, and is suitable for various household appliances and industrial equipment. The disadvantage is that it is a one-time use and needs to be replaced after the fuse is blown.

Resettable thermal fuse (PTC thermistor) when the temperature risesresistanceRapidly increasing characteristics, when the temperature exceeds the set value, the resistance increases significantly, limiting the current flow and protecting the circuit safety. After the temperature drops, the resistance returns to normal and the circuit automatically recovers. This type of fuse is suitable for equipment that requires repeated protection, such as power adapters and battery packs.

Bimetallic thermal fuses are made of two metal sheets with different expansion coefficients. When the temperature rises, the bimetallic sheet bends and cuts off the circuit. This type is sensitive and durable, and is often used in home appliances, industrial control systems and other fields. Some bimetallic fuses also have an automatic reset function.

Thermal fuse thermal fuse uses special hot-melt material as the fuse element. When the temperature exceeds the set value, the material melts and the circuit is disconnected. This type of fuse has high sensitivity and good repeatability, and is suitable for the protection of precision electronic equipment and instruments.

The glass tube thermal fuse has a transparent glass tube shell and a temperature-sensitive alloy wire inside. The advantage is that it is easy to observe the status of the fuse and facilitate detection and maintenance. Widely used in overheating protection of motors, transformers and other equipment.

Ceramic shell thermal fuse has good high temperature resistance and corrosion resistance, and is suitable for use in harsh environments. Its structure is stable and can withstand large mechanical impacts. It is commonly used in automotive electronics and industrial equipment.

Miniature thermal fuses are small and suitable for electronic products with limited space, such as mobile phones, laptops, etc. Despite its small size, it still features fast response and high reliability.

As a key component for the safety protection of electronic equipment and electrical appliances, thermal fuses come in many varieties, each with its own characteristics. The traditional type is suitable for general use, the self-restoring type is suitable for repeated protection, the bimetal type is sensitive, the thermal fuse type is suitable for precision equipment, the glass tube and ceramic shell type is suitable for specific environments, and the miniature type is suitable for compact spaces. Choosing the appropriate thermal fuse can not only effectively ensure the safety of the equipment, but also extend the service life and improve product reliability. Understanding and mastering the performance and applications of different types of thermal fuses is an important step that cannot be ignored when designing and maintaining electronic equipment.