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Fuses

Fuses are devices designed to limit the amount of current flowing through an electrical system. They are used to protect both components and wiring from excess temperature, overload, and short-circuiting. Fuses offer a simple and reliable form of protection, as they are relatively inexpensive and can be easily replaced.

38212000000 Application Field and Working Principle

The 38212000000 series of time-delay fuses are applicable for use in general electrical equipment and circuits in residential or commercial buildings. They are suitable for branch circuit and circuit-breaker protection when used with Type CMC branch-circuit, circuit-breaker, or other overload protection devices. The operation of the 382 1200 0000 fuse is based on a current-sensing element placed in the fuse element. The current passes through the sensing element and heats it up. When the current reaches the rated value, the heat generated by the current causes the fuse element to melt, releasing the internal contact and breaking the circuit. Additionally, the design of this fuse is such that upon cooling of the fuse element, it returns to its original shape, thereby restoring contact. This ensures repeatability of protection and and allows for easy fuse resetting.

Commonly available ratings in this series include 10A, 20A, 30A, 40A, 50A, 60A, 70A, 80A, 90A, and 100A. It is important to note that the preferred ratings of the 382 1200 0000 series should never be modified since this could damage the fuse element and fail to provide adequate current protection.

Other Considerations

In addition to ensuring that the ratings of the fuse are never modified, it is also important to remember that the fuse should be sized correctly for the appropriate voltage class. The 382 1200 0000 series is available in both 120V and 250V classes. Additionally, many of the fuses in this series offer a low breaking capacity and, thus, should never be used in circuits with higher currents or short-circuit currents greater than the values listed in the fuse catalog. When selecting this type of fuse, it is also important to ensure that the ambient temperature is taken into consideration, as high temperatures can increase the chance of fuse element failure.

The 382 1200 0000 series also offers a variety of additional features, including a pre-inserted indicator to provide visual indication of tripped fuse, built-in O/L and/or S/C protection, and a choice between three different types of fuse body materials (glass, ceramic, and thermoplastic).

Conclusion

The 382 1200 0000 series of time-delay fuses offer reliable protection for general electrical systems and circuits in residential or commercial buildings. They are available in a variety of ratings, are suitable for both branch circuit and circuit-breaker protection, and offer additional features such as built-in O/L and S/C protection, as well as a pre-inserted indicator to provide visual indication of tripped fuse. It is important to remember that fuse sizing and ratings should always be correct for the appropriate voltage class and that fuse element failure is more likely at higher ambient temperatures.

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