Detailed explanation of thermal fuse models Selection and application guide

As an important component for the safety protection of electronic equipment and electrical appliances, thermal fuses are widely used in various electrical products. Understanding the thermal fuse models and their characteristics is of great significance for correct selection and ensuring the safe operation of the equipment. This article will provide a comprehensive introduction to thermal fuse models to help readers master the key points of purchase and application skills.

1. Basic concept of thermal fuse

Thermal Fuse is a protective component that automatically opens when the temperature reaches a set value. It is mainly used to prevent electrical appliances from overheating, causing fires or equipment damage. It uses the sensitive alloy wire inside to fuse at high temperature, thereby cutting off the circuit and ensuring safety.

2. Classification of thermal fuse models

Thermal fuse models are usually classified according to rated temperature, rated current, size structure and appearance. Common categories include:

Divided according to rated temperature: such as 72℃, 90℃, 105℃, 128℃, 150℃ and other models, suitable for different temperature control needs.

Divided according to rated current: such as 0.5A, 1A, 3A, 5A, etc., to meet the protection requirements of different load currents.

According to the packaging form: pin type, lead type, chip type, etc., to facilitate the installation of different equipment.

3. Importance of rated temperature

The primary basis for selecting a suitable thermal fuse model is its rated temperature. This temperature represents the temperature threshold at which the fuse begins to open. If the rated temperature is too low, it may cause false interruptions and affect the normal operation of the equipment; if it is too high, the equipment may not be protected in time. Generally, the selection is based on the maximum operating temperature and safety margin of the equipment.

4. Matching of rated current

The current rating of the thermal fuse must match the maximum operating current in the circuit. If the rated current is too small, the fuse will be frequently disconnected, affecting normal use; if the rated current is too large, the protection effect will be insufficient and there will be safety hazards. Therefore, it is necessary to refer to the circuit design parameters for correct selection.

5. Dimensions and installation methods

Different models of thermal fuses vary in size and installation method. Small household appliances mostly use lead-type thermal fuses, which are easy to weld and install; industrial equipment may use chip or pin-type thermal fuses, which are easy to replace and maintain. When selecting, the product structure and installation environment must be considered.

6. Response time of thermal fuse

Response time refers to the length of time it takes for the thermal fuse to open after reaching the rated temperature. Different models have different response times. The fast response type is suitable for scenarios where the temperature changes rapidly; the slow response type is suitable for equipment with large temperature fluctuations. Reasonable selection of response time can improve the protection effect.

7. Brand and quality certification

High-quality thermal fuse brands usually have complete quality testing systems and certifications, such as UL, CSA, VDE and other international certifications. Choosing certified products can ensure stable performance, high reliability and reduce safety risks.

8. Application fields and model selection

Different application areas have different requirements for thermal fuse models. Household appliances such as electric kettles and hair dryers usually use models with a rated temperature of 90°C to 150°C; industrial equipment may choose products with higher rated temperatures and larger current specifications. Combined with specific application environment selection, equipment safety can be effectively guaranteed.

There are many types of thermal fuses, and factors such as rated temperature, rated current, size, structure, and application environment must be considered when purchasing. Reasonable selection can not only effectively prevent equipment overheating and fire risks, but also extend the service life of the equipment. Understanding the characteristics and applicable scope of different models is the key to ensuring the safe operation of electrical equipment. I hope this article provides valuable reference and help for you to purchase and apply thermal fuses.