Detailed explanation of micro fuse inspection standards

With the wide application of electronic products and electrical equipment, micro fuses are important components of protection circuits, and their quality is directly related to the safe operation of the equipment. Therefore, it is particularly important to formulate and follow strict inspection standards for microfuses. This article will focus on the inspection standards of micro fuses, introduce their core contents in detail, and help relevant companies and technicians better understand and apply these standards.

Appearance is the first checkpoint for the quality of micro fuses. The inspection includes whether the fuse shell is intact without cracks, obvious scratches or deformations, whether the end cap is firm and free of rust, and whether the label and logo are clearly visible. Fuses with substandard appearance can easily lead to subsequent performance problems, so they must be strictly controlled.

Miniature fuses must meet the design's rated current and rated voltage requirements. Use professional equipment to apply the rated current to the fuse to check whether it can disconnect the circuit normally within the specified time to prevent equipment damage or safety accidents caused by overload. At the same time, it is ensured that it can work stably under the rated voltage without breakdown or leakage.

The blowing time is an important indicator of the response speed of the fuse. The standard stipulates the fusing time range of the fuse under different current values. Precision testing instruments must be used during inspection to ensure that the fuse can blow quickly in the event of a short circuit or overload to protect the circuit from damage.

The insulation performance of the micro fuse directly affects its safety. During the inspection, the insulation between the fuse end cap and the shell needs to be tested.resistance, confirm that it meets the standard requirements and avoid potential safety hazards such as leakage and short circuit during use.

The fuse will generate a certain amount of heat when passing current, and the temperature rise test is used to detect whether its heating is within a safe range. Excessive temperature rise may cause damage to the fuse itself or surrounding components, so the temperature rise index needs to be strictly controlled to ensure long-term stable operation.

Micro fuses may be subject to mechanical shock or vibration during transportation and installation. Mechanical strength testing ensures that their structure is stable and not easily damaged. The test content includes vibration resistance, impact resistance and the firmness of the end cap to ensure the service life and safety of the fuse.

Fuses need to adapt to various environmental conditions, such as high temperature, high humidity, salt spray, etc. The environmental adaptability test simulates different climate and environmental conditions to test the fuse's corrosion resistance, moisture resistance and high temperature resistance to ensure that it can still work reliably in complex environments.

This test simulates the behavior of a fuse when a circuit is short-circuited, checking whether it can quickly blow and cut off the circuit to prevent fire or equipment damage. The test must comply with relevant safety standards to ensure that the fuse has good short-circuit protection function.

As an important protective component of electronic and electrical equipment, microfuses' inspection standards cover many aspects such as appearance, performance, mechanical and environmental adaptability. Strictly following these standards can not only ensure the quality and safety of fuses, but also improve the reliability of the entire circuit system. When producing and selecting micro fuses, companies should fully understand and implement relevant inspection standards to ensure that products comply with industry specifications and user needs, and to protect equipment safety.