AHEF100

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PTC resettable fuses are a type of fuse which will open electrical connections when a pre-determined amount of current is exceeded, but which can be reset with a decrease in current. This makes them attractive in applications where over-current may be periodic or involuntary, and a simple U.S. or European-style fuse might repeatedly require manual replacement.

AHEF100 application field and working principle are the same as any other PTC fuse, but its size and shape make it well-suited for applications such as automobiles and other mobile devices. The AHEF100 is a cylindrical fuse with a diameter and length of 8x30mm, respectively, and a rated current of 100A. The AHEF100 contains an exposed metal core, a PTC element, and a bismaleimide resin insulator at the joint area. In addition, a method of enclosing the element and the core is used to improve resistance to various environmental conditions, such as humidity and vibration.

When the appliance is operating normally, the current passing through the AHEF100 remains below the holding current range (which is the trip value multiplied by the rated current). This allows the element to stay in a conductive state until the current reaches the overload protection value. As the current exceeds the rated current, the resistance of the element increases, resulting in an increased voltage drop. This will cause the temperature in the element to rise and create a protective layer of insulation to open the connection, interrupting the excessive current.

Once the protective layer is created, the circuit is de-activated until the current falls below the trip value. At that point, the protective layer will dissipate, and the current resumes at a normal level. This cycle allows the AHEF100 to protect the circuit from abnormal levels of current while providing an easy way to reset the fuse.

The small size of the AHEF100 makes it an attractive choice for portable and automotive applications, where space is often at a premium and where normal operation may involve irregular current levels. This type of fuse is easy to replace and its protective features provide excellent safety in situations where current is likely to exceed acceptable levels.

Overall, the AHEF100 is a reliable PTC resettable fuse which is suitable for a variety of application fields and provides a proven level of protection. Its small size and resistance to environmental conditions make it well-suited to automotive or other mobile applications, while its ability to provide fault protection and easy reset makes it attractive in a variety of other industrial and consumer applications.

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