FNW-12

Electrical, Specialty Fuses: FNW-12 Application Field and Working Principle

Introduction: FNW-12 is variation in a line of fuse products within the larger class of Specialty Fuses. FNW-12 provides a wide range of electrical protection applications in many settings. It is designed to protect electronic circuits from damages caused by extreme voltage changes or short circuits. This article is a review of the FNW-12 application field and its working principle.

FNW-12 Basics

The FNW-12 is a thermally activated fuse intended to protect against heat-related losses that occur when the fuse is subject to extreme current. Its precise temperature ratings depend on the construction and application. Generally, FNW-12 fuses are designed to open a circuit, breaking the current flow when the temperature of the fuse exceeds its temperature rating. In other words, FNW-12 contains a temperature-controlled device that monitors the temperature of the fuse.

FNW-12 Application Field

FNW-12 is suitable for the protection of ac systems, dc systems, and motor circuits. It is used to protect against damage from faults with a wide range of current levels. It can be used in low-voltage environment such as 15A, 600V, and in line to line voltage systems such as 10A, 32V. It is widely used in electrical circuits, motors, transformers, and power supply circuits for a variety of applications. It is particularly useful in high-temperature and high-voltage environments. FNW-12 is also suitable for use in hazardous areas since it requires only simple external safety devices and can be used to interrupt current within milliseconds.

FNW-12 Working Principle

The FNW-12 operates with a mechanical-thermal coupling. When the fuse heats up, the bimetallic element inside the fuse expands which causes a mechanical interruption of the fuse connection. Since the temperature in the fuse is directly proportional to the current, the fuse operates fast enough to prevent overheating in the circuit. Additionally, the FNW-12 is designed with a special coating, which prevents sensitization of the bimetallic element from overcurrent, and therefore increases its longevity. In order to keep a constant flow of current, the FNW-12 has an internal venting system that allows partial gas escape and prevents the accumulation of pressure inside the fuse.

When the current passes through the FNW-12, the temperature increase is controlled by the bimetallic element. The fuse connection is automatically cut off before the temperature of the circuit exceeds the rated level. As the current is interrupted, the current in the circuit is reduced and the circuit is protected from damages due to overheating.

Conclusion

The FNW-12 is an important tool in the protection of electrical circuits against extreme temperatures and voltage. Its wide range of applications, fast, precision operation, and simple device installation make it a versatile, reliable tool in the protection of circuits. Its temperature-sensitive design and internal venting system ensure its long operational life.