LFH256003C Circuit Protection

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Fuseholders are specialized items of electrical equipment that are designed to provide safe and reliable protection to electrical circuits, equipment, and components. This article discusses the LFH256003C device and its application field and working principle.

What is LFH256003C?
LFH256003C is a type of fuseholder manufactured by Littelfuse. It is a compact, horizontal design device that has double open ends for accommodating two midget size fuses of the same class. Their design improves space saving in circuit boards and enclosures.

Application Field of LFH256003C
LFH256003C has a wide range of applications, including use in consumer electronic devices, microwave ovens, medical devices, power equipment, UPS systems (Uninterruptible Power Supplies), lighting control, motor control, AC/DC power supplies, and air conditioning systems. They are also used in applications that require a maximum of 10A of continuous current. Moreover, this product is certified by UL 94V-O for its flame resistant housing.

Working Principle of LFH256003C
LFH256003C works by protecting the circuitry from transient overloads and short circuits. When a potentially damaging current flows through the circuit, the corresponding fuses will blow to protect circuits from further damage. To do so, a negative differential resistance (NDR) device is mounted in the fuseholder. The NDR device is designed to conduct a small amount of current until an excessive overcurrent level is reached. Then, the NDR instantly changes state, reducing the current flow and allowing the fuses to function as intended.

The current levels and the configuration of the fuses and the NDR device depend on the application. In general, the NDR device should be chosen to cut off the supply of current as soon as the fuses are blown. The operating principle of the LFH256003C also includes protection of circuits from reverse connection of the primary. In order to avoid any possible electrical shocks, the fuseholder is designed with a polarised cover and contacts to properly identify the orientation of the fuses.

Conclusion
The LFH256003C fuseholder from Littelfuse is a compact, horizontal design device that is widely used in various applications. It incorporates two midget size fuses of the same class and features NDR devices that protect circuits from transient overloads and short circuits. Furthermore, it has a UL 94V-O flame resistant housing, and a polarised cover and contacts to avoid any electrical shocks. All of these features make the LFH256003C fuseholder a safe and reliable choice for consumers.

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