Fuses Installed in Series in Protected Circuits

2026-04-27 12:36:11 shurongfuse

The fuse, commonly known as a safety fuse, is a proven short-circuit protection device widely deployed in power distribution networks and control systems. It delivers reliable protection against short circuits and severe overloads, functioning as a simple, cost-effective and high-efficiency circuit protection component. The industry is now evolving toward high breaking capacity, wide compatibility and rapid response. Shuguang provides a comprehensive portfolio of fuses in complete types and specifications, whose performance keeps pace with industry development and fully meets protection requirements for diversified application scenarios.

A standard fuse mainly consists of a fuse element and an insulating tube or base. In actual operation, the fuse element must be connected in series within the protected circuit. When a short-circuit fault occurs, the fuse element melts instantly to cut off the circuit and secure equipment safety. Mainstream industrial fuses adopt high-conductivity materials like silver and copper for fuse elements, with insulating tubes filled with quartz sand to strengthen arc quenching performance.

Shuguang fuses adopt precisely manufactured pure silver strips as fuse elements, paired with high-strength ceramic insulating tubes. Selected models are filled with high-purity quartz sand, enabling rapid fusing response, superior arc quenching effect and more stable & dependable protection performance.

General Fuse Types and Their Applications

Fuses are manufactured in diverse types to suit different voltage and current working conditions. Shuguang optimizes the performance of full-series products to cover all mainstream categories:

Plug-in Fuse: Designed for circuit terminals with a voltage of 380V and below. Shuguang’s plug-in fuses adopt tin-plated contacts for excellent oxidation resistance, ideal for civil power distribution and light-duty industrial applications.
Screw-type Fuse: Equipped with a fuse blown indicator, suitable for circuits up to 500V and 200A. With enhanced indicator sensitivity and impact-resistant ceramic housing, Shuguang’s products are well-suited for machine tool electrical control systems.
Enclosed Fuse: Available in filled and non-filled structures. The quartz sand-filled version features outstanding breaking capacity. Shuguang’s enclosed fuses adopt high-purity quartz sand and premium tight sealing design, ensuring stable operation in harsh and complex environments.
High-speed Fuse: Specially developed for semiconductor rectifier protection. Its fuse element adopts a V-shaped deep-groove silver structure. Shuguang’s high-speed fuses achieve millisecond-level disconnection, with a breaking capacity up to 200kA, perfectly applicable to high-voltage DC scenarios such as photovoltaic power generation and energy storage systems.
Self-resetting Fuse: Taking metallic sodium as the core element, it limits surge current without breaking the circuit and supports repeated use. Optimized with upgraded sealing structure, Shuguang’s self-resetting fuses reduce sodium element consumption, extend service life, and are widely applied in precision power distribution systems.

Fuse Parameter Selection Guidelines

Combining national industry standards and Shuguang’s product technical features, four key principles should be followed for correct fuse selection:

The rated voltage shall be consistent with the circuit’s working voltage; overvoltage use is strictly forbidden. Shuguang’s product line covers multiple voltage grades including 380V, 500V and 10kV.
The rated current shall be higher than the long-term maximum operating current of the circuit, so as to prevent unnecessary fusing under normal working conditions.
The limited current rating shall surpass the maximum short-circuit current of the circuit, avoiding fuse damage during fault isolation. The maximum limited current of Shuguang’s high breaking capacity fuses reaches 3600A.
The rated current of fuse elements shall match motor operating characteristics. The motor starting current can reach 4~8 times of the rated current. The custom-designed fuse elements can resist aging and avoid accidental fusing during startup. Shuguang can customize fuse characteristics to meet personalized operating demands of various motors.

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