35kV/33kV Vacuum Circuit Breaker

HUAJIDIAN Group operates dedicated, fully automated production lines for these 35kV/33kV vacuum circuit breakers. Every unit undergoes rigorous factory testing before shipment and comes with 3C certification, factory test reports, and type test reports, fully compliant with GB/T 1984-2014 and IEC 60694 standards.

All core components are genuine HUAJIDIAN parts, eliminating compatibility issues associated with third-party components and ensuring a unified warranty for the entire unit. This standardized facility integrates R&D, production, and after-sales service, offering comprehensive switchgear solutions compatible with various indoor fixed-type cabinets. As a global supplier, HUAJIDIAN provides bilingual (Chinese/English) technical drawings and installation documentation to facilitate project delivery both domestically and internationally.

Product Overview and Applications

1. Power distribution rooms for industrial enterprises (mines, steel mills, cement plants, etc.)

2. Renovation and new construction projects for urban and rural public substations

3. High-rise power distribution systems for commercial complexes and industrial parks

4. Non-standard distribution equipment for box-type substations and ring main units (RMU)

5. Facilities with flammable or explosive environments, such as chemical and new material plants

Product Structural Features

1. Compact, space-saving design

The 35kV/33kV Vacuum Circuit Breaker features a white operating panel paired with red solid-insulated poles arranged horizontally. It requires no rear clearance for operation, allowing the cabinet depth to be kept within 900mm. Comes standard with a dedicated mounting base and pre-drilled standard installation holes; suitable for integration into switchgear cabinets or independent installation in ring main units (RMUs) and box-type substations.

2. Mechanical Interlock to Prevent Misoperation

Features an integrated mechanical interlock mechanism on the panel that interlocks with the cabinet's disconnect and grounding switches, effectively preventing high-risk errors such as closing the grounding switch under load or grounding live circuits.

3. High-Strength APG Insulated Poles

Utilizes APG (Automatic Pressure Gelation) epoxy insulation cylinders; dielectric strength far exceeds IEC standards. Resistant to humidity, dust, and condensation, eliminating risks of creepage and flashover.

4. Proven Integrated Spring Mechanism

The integrated spring mechanism boasts over 20 years of market validation, offering a mechanical lifespan of up to 30,000 operations and 50 full-capacity short-circuit breaking operations. Stable opening and closing performance makes it ideal for industrial applications requiring frequent switching.

Core Technical Specifications Table

Five Key Advantages

1. Vacuum Arc Extinguishing: Safe for High-Risk Environments

Features a built-in high-vacuum interrupter; fault interruption occurs without open flames or explosion risks, preventing secondary accidents. Suitable for flammable and explosive environments, such as chemical processing plants.

2. Solid-Sealed Insulation: Resilient in Harsh Environments

Integrated solid-sealed epoxy poles resist humidity, dust, and condensation, significantly reducing the frequency of insulation-related failures.

3. Ultra-Fast, Comprehensive Protection: Minimizing Equipment Damage

Provides full-range protection against overloads, short circuits, and leakage currents. Rapid fault current interruption—with opening times ≤0.05s and closing times ≤0.1s—protects downstream transformers, motors, and transmission lines.

4. Up to 10 Years of Maintenance-Free Operation: Lowering O&M Costs

Solid-sealed poles eliminate the need to replace interrupters or insulation components; routine maintenance is limited to cleaning the operating mechanism, drastically cutting costs for spare parts and manual inspections.

5. Unified OEM Support: Streamlined After-Sales Service

All components are genuine HUAJIDIAN parts, ensuring perfect electrical and dimensional compatibility. Unified after-sales service eliminates the complexities associated with coordinating repairs across multiple suppliers.

Customization Services

1. Current and Breaking Capacity: Rated currents of 630A/1250A and short-circuit breaking currents of 20/25/31.5kA are available.

2. Operating Power Supply: Standard DC 110V/220V; AC control schemes can be customized upon request.

3. Intelligent Upgrade: Optional online monitoring modules enable remote opening/closing, real-time monitoring of contact temperature and equipment status, and compatibility with power automation systems.

Real-World Project Applications

1. 35kV Power Distribution Project at a Non-ferrous Metal Mine in Inner Mongolia

In 2023, the underground main substation of a large copper mine procured 16 units of HUAJIDIAN 33kV 1250A/31.5kA circuit breakers. Given the mine's dusty environment and significant diurnal temperature fluctuations, the solid-sealed poles effectively eliminated the condensation-induced flashover issues common with older oil-type switches. After three years of continuous operation requiring only mechanism cleaning, the substation's annual O&M costs dropped by 68%, while interlocking devices eliminated multiple risks of operational errors during maintenance.

2. Box-type Substation Project for a Chemical Industrial Park in Zhejiang

In 2024, a fluorochemical enterprise procured 9 customized circuit breakers equipped with intelligent monitoring modules. Located in a Class A explosion-proof zone, the vacuum arc-extinguishing technology eliminates open flames, thereby removing the risk of short-circuit fires. Remote monitoring enables unmanned operation of the box-type substations, and rapid tripping during two separate line short-circuit faults prevented losses associated with large-scale production shutdowns.

FAQ

Q1: What is the maintenance cycle for the HUAJIDIAN 35kV/33kV vacuum circuit breaker? Is periodic replacement of parts required?

A1: The solid-sealed poles and vacuum interrupters feature a 10-year maintenance-free period; routine maintenance involves only cleaning dust from the spring mechanism and lubricating transmission components. There is no need to replace the interrupter or insulating poles within 10 years, significantly reducing spare parts inventory and maintenance workload.

Q2: Can this 33kV circuit breaker be used only with XGN fixed switchgear, or is it compatible with non-standard equipment like Ring Main Units (RMUs) and box-type substations?

A2: It is compatible. The unit is equipped with a universal standard mounting base; it can be integrated into XGN switchgear or used to independently mount non-standard power equipment such as ring main units (RMUs) or box-type substations. The base dimensions can be adjusted at the factory based on the customer's cabinet drawings.

Q3: What qualification documents can HUAJIDIAN provide for power grid and industrial project tenders?

A3: We provide a complete set of official credentials, including 3C mandatory certification, factory inspection reports for the complete unit, and third-party type test reports compliant with both national (GB) and IEC standards. All documents bear official stamps, meeting the requirements for domestic grid tenders as well as customs clearance and acceptance for overseas projects.