170M4259

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Electrical fuses are devices used to protect electrical circuits and associated equipment for overcurrent situations. Specialty fuses such as the 170M4259 provide protection for specific applications such as solar, industrial, and motor applications and provide the advantage of a faster response and more precise protection than regular fuse devices. This article will explain the application field and working principle of the 170M4259.

Application Field

The 170M4259 is a miniature, fast-acting blade fuse, designed for the protection of photovoltaic (PV) / solar array strings, junction boxes, or electrical systems. It is also suitable for small motor applications, industrial control equipment, overload and short-circuit protection, and overvoltage protection. The fuse has a compact design, with a blade mounted base and terminals featuring slotted holes, making it ideal for use in the tight spaces that are often found in solar and motor applications.

Working Principle

The 170M4259 blade fuse operates with a fixed time-delay characteristic which is optimized for higher current loops. This works by the current passing through the fuse heating the element which is surrounded by a thermal cut-off disc. This disc melts, triggering the overcurrent protection. This quick and accurate reaction saves time when fault finding and isolating defective circuits. The fuse will not reset after being tripped, so manual replacement of the fuse is required after the overcurrent protection is triggered.

The fuses are available in four current ratings, 16A, 20A, 25A, and 32A, and all come with a UL/C-UL recognized rating and RoHS compliance. Operating temperature range is -30°C to +85°C. The small size of the fuse makes them suitable for applications with limited space for fuse protection and the high tolerance towards cycling and power surges makes them equally suitable for heavy-duty applications.

Conclusion

The 170M4259 is a fast-acting mini blade fuse designed for the protection of solar array strings, junction boxes, electrical systems, and small motor applications. It features a fixed time-delay characteristic which is optimized for higher current loops and is available in current ratings of 16A, 20A, 25A, and 32A. The fuse has a compact design and will trigger the overcurrent protection quickly and accurately in response to specific application requirements. This helps to save time when fault finding and isolating defective circuits.

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