12 11kv Indoor Vcb Vacuum Circuit Breaker

The Usune VS-12 (VEP-12) series 12 11kv Indoor Vcb Vacuum Circuit Breakers are high-performance indoor high-voltage switchgear integrating control and protection functions, mainly used in 12/11kV indoor medium-voltage power distribution systems. As a manufacturer specializing in the research and development and production of high-voltage electrical equipment, Usune has a standardized factory in China, integrating R&D, production, testing, and after-sales service to ensure that every product meets domestic and international industry standards. The product offers both fixed and drawer-type installation options, allowing for flexible integration with various switchgear to meet the installation needs of different scenarios such as industrial workshops, power distribution rooms, and commercial buildings.

The core advantage of the 12 11kv Indoor Vcb Vacuum Circuit Breaker lies in its adoption of third-generation solid-encapsulated insulation technology, a significant breakthrough in the evolution of vacuum circuit breaker insulation technology. From first-generation air insulation and second-generation composite insulation to today's third-generation solid-encapsulated insulation, Usune has continuously optimized the insulation structure, solving the pain points of traditional products being susceptible to environmental influences and having poor stability, thus driving the technological upgrade of vacuum circuit breakers in the industry.

Evolution of Insulation Technology

The pole insulation of vacuum circuit breakers has undergone three generations of technological upgrades. The Usune VS-12 (VEP-12) series adopts the most advanced third-generation solid-encapsulated insulation technology, achieving a qualitative leap:

1. First-generation air insulation

Live parts are completely exposed to the air. The insulation level is greatly affected by environmental factors such as humidity, dust, transportation impacts, and small animals, resulting in poor stability and a high failure rate.

2. Second-generation composite insulation

The arc-extinguishing chamber is protected by an epoxy resin bushing, but the high-voltage live parts are not completely sealed and are still affected by external factors such as dust, moisture, and insects, failing to fundamentally solve the environmental adaptability problem.

3. Third-generation solid-encapsulated insulation (used in the Usune VS-12 series)

Through APG technology, the arc-extinguishing chamber and upper and lower outgoing terminals are encapsulated with epoxy resin. This not only reduces the volume of the arc-extinguishing chamber but also completely isolates the equipment from the influence of the external environment (dust, moisture, etc.), significantly improving weather resistance and operational stability. The epoxy resin also serves as primary insulation and mechanical support, with superior electric field and stress distribution compared to various irregularly shaped insulation partition structures, ensuring long-term stable operation of the equipment.

Core Product Advantages

1. Excellent insulation performance

Utilizing third-generation solid-encapsulated insulation technology, it is unaffected by the external environment, has high insulation reliability, and effectively avoids insulation failures caused by environmental factors.

2. Superior Electromechanical Performance

Long mechanical life (up to 20,000 cycles, 10,000 cycles for 50KA rating), high rated short-circuit breaking current (20-40KA), fast opening and closing speed, enabling rapid fault isolation and protecting the safe operation of the power system.

3. Compact Structure and Flexible Installation

Solid-encapsulation technology reduces product size; fixed and drawer-type options are available, allowing for flexible integration with various switchgear and adaptability to limited installation space in indoor distribution rooms.

4. Low Maintenance Costs

The solid-encapsulation structure prevents live parts from external corrosion, reducing maintenance frequency and achieving maintenance-free primary operation, significantly saving users' subsequent maintenance costs.

5. Strict Quality Control

As a professional manufacturer, Usune has established a comprehensive quality inspection system in its Chinese factory. Every product undergoes rigorous performance testing before leaving the factory to ensure that parameters meet standards and quality is reliable.

Key Technical Parameters

The Usune VS-12 (VEP-12) series 12 11kv Indoor Vcb Vacuum Circuit Breaker boasts excellent technical parameters, fully meeting the requirements of 12/11kV medium-voltage power distribution systems. Key specifications are shown in the table below (parameters apply to domestically produced arc-extinguishing chambers):

Practical Application Case

To verify the reliability and applicability of the Usune VS-12 (VEP-12) series 12 11kv Indoor Vcb Vacuum Circuit Breaker, this product was successfully applied to a power distribution renovation project in a large chemical industrial park in East China (a key local industrial upgrading project). The park has complex operating conditions, high humidity, high dust levels, and frequent changes in power load. Existing circuit breakers frequently experienced insulation failures due to environmental factors, affecting normal production in the park.

After in-depth investigation and comparison, the park selected Usune as its designated supplier, adopting 36 Usune VS-12 (VEP-12) series fixed indoor VCBs, all manufactured by Usune in its Chinese factory. This product utilizes third-generation solid-encapsulated insulation technology, effectively resisting the effects of high humidity and dust in the industrial park. Its rated short-circuit breaking current of 31.5kA fully meets the power protection needs of high-power equipment in the park.

Since its official commissioning in October 2024, 36 VCB units have operated stably for over six months without any insulation or operational faults, achieving an average failure rate of 0. This significantly reduces the park's power system operation and maintenance costs, ensuring the continuous and stable operation of production equipment. The project has been highly recognized by the park management, and Usune has become a long-term power equipment supplier for the park.

Outer Dimensions

Project Reference

Cas-space Rocket Launch Project

Test Report

FAQ

Q1: What is the service life of the Usune VS-12 (VEP-12) series 12 11kV Indoor Vcb Vacuum Circuit Breaker, and what maintenance is required during its use?

A1: The product's mechanical life is up to 20,000 cycles (10,000 cycles for 50kA class), and the rated current breaking cycle is 20,000 cycles (10,000 cycles for 50kA class). Thanks to the adoption of third-generation solid-seal insulation technology, the primary side of the product is maintenance-free. In daily use, only periodic inspections of the secondary circuit and operating mechanisms (such as the energy storage motor and operating voltage), cleaning of the equipment surface, and prevention of dust accumulation are required to effectively extend the equipment's lifespan.

Q2: Can the Usune VS-12 (VEP-12) series VCB be used in harsh indoor environments (such as high humidity and dust)?

A2: Yes. The product uses third-generation solid-seal insulation technology, encapsulating the arc-extinguishing chamber and upper and lower outgoing terminals with epoxy resin using the APG process. This completely isolates the high-voltage live components from the external environment, preventing them from being affected by dust, moisture, insects, etc. It exhibits excellent weather resistance and environmental adaptability, making it perfectly suitable for harsh indoor environments such as high-humidity, dusty industrial workshops, chemical plants, and mines. Actual application cases in the East China Chemical Industrial Park also confirm this.