Hv Indoor Vacuum Circuit Breaker

The HV Indoor Vacuum Circuit Breaker is an indoor high-voltage three-position vacuum circuit breaker, positioned as "safe, reliable, efficient, maintenance-free, and adaptable to all scenarios." It is suitable for 3.6-12kV power systems, addressing the pain points of traditional circuit breakers and serving as a core protection unit for power grids and industrial equipment.

Item code and meaning

Note: If there is no grounding switch, the grounding operation shaft acts as an interlocking shaft, and the dimensions remain unchanged.

Core Advantages

1. Superior Electromechanical Performance and Long Lifespan

Stable mechanical structure and excellent electrical performance. Mechanical lifespan reaches 3000 cycles for disconnect switches, 10000 cycles for circuit breakers, and 3000 cycles for grounding switches. The main circuit uses solid-state embedded poles, improving environmental adaptability and insulation reliability, achieving maintenance-free operation and reducing maintenance costs.

2. Modular Design and Convenient Operation

The modular frame integrates multiple core components, achieving a miniaturized design. The operating mechanism can be independently replaced and maintained, supporting manual operation, AC/DC energy storage, and remote control, adapting to different operational needs and improving efficiency.

3. Multiple Protections to Prevent Misoperation

The HV Indoor Vacuum Circuit Breaker is equipped with comprehensive electromechanical interlocking devices. The disconnector has a visible break after tripping, the cabinet door is interlocked with the grounding switch, and the outgoing line is equipped with a contactless live-line indicator sensor, comprehensively ensuring operational and equipment safety.

4. Versatile Applications

It adapts to various cabinet types and can be installed in both forward and reverse directions. Suitable for various loads, it is especially suitable for scenarios involving frequent operation and multiple short-circuit current interruptions, meeting diverse power distribution needs.

Core Technical Parameters

Real-World Application Case

A case study from a medium-sized industrial and mining enterprise in eastern China verifies the product's practical value: The enterprise's 10kV power distribution system originally used traditional oil circuit breakers, which suffered from high losses, complex maintenance, and a high failure rate (8%). After replacing the faulty circuit with the HV Indoor Vacuum Circuit Breaker in 2023, maintenance-free operation was achieved, saving 30,000 RMB in annual maintenance costs, reducing energy consumption by 68%, lowering the failure rate to below 1%, and ensuring stable operation for 18 months without failure. This fully demonstrates the product's value in "cost reduction, efficiency improvement, and safety," showcasing Usune's professional capabilities as a supplier.

Product Usage and Maintenance Instructions

1. Applicable Operating Conditions

The HV Indoor Vacuum Circuit Breaker is suitable for indoor environments with altitudes ≤1000m, seismic intensity ≤8 degrees, and no explosive corrosion or severe vibration, with daily average humidity <95% and monthly average humidity <90%. For altitudes above 1000m, professional calculations are required during selection.

2. Operating Procedures

Supports manual and electric operation: Manual operation requires a dedicated energy storage handle for energy storage before closing and opening the circuit breaker; electric operation requires connection to a secondary power supply, energy storage, and operation via control buttons. The isolating switch opens clockwise and closes counterclockwise. The cabinet door and grounding switch are interlocked for safety.

3. Maintenance Requirements

The entire unit is maintenance-free; the vacuum interrupter should only be inspected if external damage is suspected. The operating mechanism requires regular inspection, and the exterior should be cleaned after 5 years of operation or after maintenance. Maintenance must be performed by qualified personnel; the auxiliary power supply should be disconnected first.

Outer dimension and wiring diagram

ZN19-12GD/(1250)-(31.5) inversion installation

ZN19-12GD/(1250)-(31.5) normal installation

Brand Guarantee and Partnership Advantages

As a professional manufacturer, Usune possesses a modern factory. Our HV Indoor Vacuum Circuit Breaker undergoes rigorous performance and mechanical break-in testing before leaving the factory; packaging and transportation are standardized to ensure the equipment arrives in good condition. As a high-quality domestic supplier in China, Usune provides customized solutions, comprehensive after-sales service, and fast delivery. Our products are exported overseas, making us a preferred choice in the industry for our superior quality, and we continuously provide users with reliable power distribution solutions.