Blogs

Home » Blogs » Company News » A Comprehensive Analysis of High-Voltage Fuse Classifications

A Comprehensive Analysis of High-Voltage Fuse Classifications

Views: 0 Author: Site Editor Publish Time: 2025-11-26 Origin: Site

Inquire

In power systems, high-voltage fuses serve as key overload and short-circuit protection devices. With their simple structure and reliable operation, they are widely used in protection scenarios such as substations, power transmission and distribution lines, and various electrical equipment. This article systematically introduces the classification system of high-voltage fuses from a professional perspective, helping readers deeply understand their technical characteristics and application value.

微信图片_2025-11-16_145943_904

Classified by Operating Environment: Precise Adaptation for Indoor and Outdoor Use

Indoor High-Voltage Fuses

Mainly featuring a sealed tube structure filled with quartz sand for arc extinguishing, they belong to current-limiting fuses and can interrupt circuits before the short-circuit current reaches its peak. Typical representatives include the RN series (RN1 and RN5 types for line and equipment protection, RN2 and RN6 types specifically for voltage transformers). They offer advantages such as high breaking capacity and no emission of ionized gases, making them suitable for enclosed environments like 3.6~12kV power distribution devices and substations.

Outdoor High-Voltage Fuses

Divided into drop-out and current-limiting types:

Drop-out type (e.g., RW3~RW11 models): Composed of porcelain insulators and fuse tubes. After fusing, the fuse tube falls by its own weight to form a visible break point, integrating protection and isolation functions. Widely used in 10kV power distribution lines and transformers below 315kVA.
Sealed jet type: Encapsulated in fully insulated porcelain bottles, with strong pollution and salt resistance. Equipped with condition monitoring devices, it significantly improves the safety and efficiency of outdoor operation and maintenance.

Classified by Structure and Function: From Arc Extinguishing Methods to Operational Characteristics

By Current-Limiting Capacity

Current-limiting type: Relies on quartz sand to split and cool the arc, achieving rapid interruption and reducing dynamic and thermal impacts on equipment (e.g., RXW0-35 outdoor fuses).
Non-current-limiting type: Extinguishes arcs through gas generation and longitudinal blowing in the fuse tube (e.g., traditional drop-out types), suitable for scenarios with small short-circuit currents.

By Structural Form

Including cylindrical (quartz sand-filled, for power distribution protection below 100A), spiral (for short-circuit protection in flammable locations), and plug-in (for convenient maintenance of lighting circuits) types. Sealed fuses are more adaptable to harsh environments due to their sealing advantages.

Classified by Protection Object: Customized Protection Solutions

General Equipment Protection

E.g., fuses for transformer protection, which need to match the overload characteristics of equipment to ensure operational selectivity.

Specialized Equipment Protection

BRW type for capacitors.
Fast-acting fuses for semiconductor rectifier components.
Aluminum fuse elements for conventional overcurrent protection at low cost.

Special Environment Protection

Vacuum fuses for pollution resistance.
Oil-immersed fuses for high temperature and pressure resistance, suitable for complex scenarios such as new energy and industrial automation.

Professional Selection for Worry-Free Safety

In practical applications, selecting the right high-voltage fuse requires comprehensive consideration of system voltage, current characteristics, ambient temperature, installation conditions, and other factors. With years of industry experience, People's Electrical Appliances Group offers a complete product line of high-voltage fuses to meet the protection needs of various power systems.