A fuse, also known as a safety fuse, is a classic short-circuit protection device widely used in power distribution networks and control systems. It specializes in short-circuit and severe overload protection, serving as a simple and high-efficiency component for circuit protection. Currently, the industry is upgrading toward high breaking capacity, strong compatibility and fast response. Shuguang Fuses provides a full range of types and specifications, with performance in line with industry trends to meet protection demands of diverse application scenarios.

A fuse is mainly composed of a fuse element and an insulating tube (base). During application, the fuse element must be connected in series within the protected circuit. In the event of a circuit short circuit, the fuse element melts instantly to cut off the circuit and achieve protection. For mainstream products in the industry, fuse elements have been upgraded to high-conductivity materials such as silver and copper, and insulating tubes are filled with quartz sand to enhance arc extinction performance. The fuse elements of Shuguang fuses are precisely processed from pure silver strips, with high-strength ceramic insulating tubes. Some products are filled with high-purity quartz sand, featuring fast fusing response, excellent arc extinction and more reliable protection.

Common Fuse Types and Applications

Industrial fuses are designed to adapt to different voltage and current scenarios. Shuguang optimizes the performance of its full-series fuse products to cover all categories:

Plug-in Fuse: Applied to circuit terminals of 380V and below. Shuguang’s adopt tin-plated contacts for oxidation resistance, suitable for civil power distribution and light-load industrial scenarios.

Screw Fuse: Equipped with a blown fuse indicator, applicable to circuits of 500V or below and 200A or less. Shuguang improves the sensitivity of indicators with impact-resistant ceramic housings, ideal for machine tool electric control systems.

Enclosed Fuse: Divided into filled and non-filled types. The filled type with built-in quartz sand delivers strong breaking capacity. Shuguang’s enclosed fuses adopt high-purity quartz sand with superior tightness, suitable for harsh and complex working environments.

Fast Acting Fuse: Designed for semiconductor rectifier protection. The fuse element adopts a V-shaped deep-groove silver strip structure. Shuguang’s fast fuses realize millisecond-level fusing with a breaking capacity up to 200kA, perfectly matching high-voltage DC scenarios such as photovoltaics and energy storage.

Resettable Fuse: Adopts metallic sodium as the fuse element, featuring current limiting without circuit breaking and reusability. Shuguang optimizes the sealing structure to reduce sodium element loss and extend service life, applicable to precision power distribution systems.

Fuse Parameter Selection

In accordance with industrial specifications and Shuguang’s product characteristics, four core principles shall be followed for fuse selection:

The rated voltage shall match the operating voltage of the circuit; overvoltage operation is strictly prohibited. Shuguang offers products covering multiple voltage levels including 380V, 500V and 10kV.

The rated current shall be higher than the long-term maximum operating current of the circuit to avoid accidental fusing under normal working conditions.

The limiting current shall exceed the maximum short-circuit current of the circuit to prevent fuse damage during fault disconnection. The maximum limiting current of Shuguang’s high breaking capacity models reaches 3600A.

The rated current of fuse elements shall adapt to motor operating conditions. The motor starting current is 4~8 times the rated current. The fuse element shall avoid aging and fusing during motor startup. Shuguang provides customized fuse characteristics to meet differentiated motor operation requirements.