7LET

Series:	LET
Part Status:	Active
Lead Free Status / RoHS Status:	--
Moisture Sensitivity Level (MSL):	--

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Introduction

Electrical, Specialty Fuses, often referred to as LET, are a type of fuse designed to be used in low-voltage and low-energy applications. These fuses are designed to protect electrical circuits from damage due to overloading or short-circuiting. The LET fuses are particularly useful in specialty applications, such as those involving radiation detection or high-voltage measurements. In this article, we will discuss the application field and working principle of LET fuses.

Application Field

LET fuses are most commonly used in applications that require accurate monitoring of current draw, such as those involving radiation detection or high-voltage measurements. These specialty fuses are also ideal for use in low-voltage and low-energy circuits, such as those found in home electronic equipment, personal medical devices, vehicles, and communications systems. These fuses also provide enhanced protection for motor starters, as they can be preset to open at a determined current. The LET fuse is also ideal for use in hazardous locations, since the fuses are certified for use in Class I, Divisions 1 & 2; Class II, Division 1; Class III, and Class IIIa hazardous locations. These fuses are available in a variety of sizes, from 1/8” to 1” in diameter and 1/16” to 2” in length, making them easy to use in almost any application.

Working Principle

LET fuses work by employing a special glass element that melts when a predetermined current level is reached. The glass element is encased in a stainless steel jacket, ensuring that the fuse is non-combustible, making it suitable for use in hazardous locations. The fuse typically consists of two terminals connected to a semiconductor disc that is placed between the two terminals. The disc has a specific melting point, which means that when the rated current is reached, the disc melts, causing the fuse to open the circuit. The LET fuses are equipped with a silver-plated copper disk that provides enhanced current control as well as increased protection from short-circuiting and other dangerous conditions. When the silver-plated copper disk melts, it has an additional effect of releasing all of the stored energy, helping to minimize the risk of circuit damage.

Conclusion

LET fuses are an ideal choice for use in low-voltage and low-energy applications, as well as hazardous locations. These fuses offer enhanced protection and precise current control, making them well-suited for specialty applications such as those involving radiation detection or high-voltage measurements. The LET fuses work by employing a special glass element that melts when the predetermined current level is reached, which then releases all of the stored energy, helping to minimize the risk of circuit damage.

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