0326.125H

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Fuses

Fuses are protective devices designed to disconnect a circuit or device from its power source when too much current flows through it, helping to prevent electrically-induced fires. One popular type of fuse is the 0326.125H, whose application field and working principle are explored below.

0326.125H Application Field

The 0326.125H fuse is often used for high amperage circuit protection in residential and commercial applications. The maximum interrupting current rating is 10,000 A at 120/240 Vac, meaning that it can handle higher levels of current while still providing protection. It is suitable for direct connection to branch circuit panels, or for other applications with single-pole fast-acting current limiting thermal device protection.

Aside from standard applications, the fuse can also be used in special applications such as cables, motors, transformers, switches, and DC/AC converters, with the final application depending on the individual requirements of the project.

0326.125H Working Principle

The 0326.125H fuse utilizes a method of current limitation and thermal protection. The fuse element is composed of a bimetallic strip, which is made up of two different metal strips bonded together. When the current flowing through the element reaches a certain level, the current creates heat in the bimetallic element, which causes the two strips to bend away from one another. This releases a spring-loaded, welded-closed contact, thus breaking the circuit, and preventing further current from passing through.

The time it takes for the fuse element to reach a temperature where the strip bends away from one another is known as the operating time, and is measured in milliseconds. The time it takes for the fuse element to cool off so the spring contact returns to its original position is referred to as the reset time, and is also measured in milliseconds. The 0326.125H has a very quick operating time of 100 ms and typically a reset time of 5000 ms. This means that it can disconnect the circuit in less than 1/10th of a second, and will return to the original connection in a couple of seconds.

When the fuse element is no longer able to safely disconnect a certain current, it needs to be replaced. This can be done quickly and easily with the help of special testers, which can determine the fuse’s need for replacement. Replacing the 0326.125H is also an effective way to ensure that the current ratings match the requirements of the circuit, helping to ensure maximum protection.

Conclusion

The 0326.125H fuse is a useful device for high amperage circuit protection in residential and commercial settings. It relies on a bimetallic strip made up of two different metal strips to limit current and provide thermal protection. It has a very quick operating time of 100 ms, and a reset time of typically 5000 ms, meaning that it can quickly disconnect the circuit in the event of an emergency while returning to a normal state within a few seconds.

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