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The Three-Position Vacuum Circuit Breaker is a high-performance indoor electrical device designed for medium-voltage power systems ranging from 3.6kV to 12kV. It integrates superior mechanical strength, environmental adaptability, and insulation reliability into one compact and modular system. As a type of vacuum circuit breaker, this product offers unmatched reliability, operational safety, and ease of maintenance, making it an ideal protection and control solution for power grids, industrial facilities, mining enterprises, and other frequently operated electrical systems.
Key Features of the Three-Position Vacuum Circuit Breaker
- Solid-Sealed Pole Technology: The main circuit uses solid insulation vacuum interrupters, greatly enhancing environmental adaptability, insulation performance, and mechanical robustness. This structure contributes to a maintenance-free operation over a long service life.
- Modular Design: The breaker adopts a fully modular frame structure that integrates the isolating switch, vacuum interrupter, earthing switch, operating mechanism, interlocking system, and sensors. This compact configuration ensures minimal installation space and superior performance.
- Visible Break Points: The rotary-type isolating switch provides a clearly visible open contact when disconnected, ensuring both visual confirmation and operational safety.
- Reliable Mechanical Interlocking: There is a forced mechanical interlocking system among the disconnector, vacuum interrupter, and earthing switch. This prevents any misoperation, improving operational stability and protecting both personnel and equipment.
- Flexible Operation: The vacuum circuit breaker supports manual operation as well as AC/DC motor spring energy storage operation. It can also be integrated with remote control systems, enhancing automation in modern smart grids.
- Safety-Oriented Cabinet Integration: The breaker fits compact cabinet sizes of 450 x 1000 x 1800 mm and can be installed in fixed switchgear, ring main units (RMU), or compact substations. The cabinet door features a mechanical interlock with the earthing switch, ensuring safe access for maintenance personnel.
Superior Safety and Insulation Performance
The vacuum circuit breaker features a vertically arranged main circuit layout:
- Upper: Isolating switch
- Middle: Vacuum interrupter
- Lower: Earthing switch
This layout allows reversed installation where necessary. The switchgear also includes a non-contact live display sensor, which uses capacitive-free, safe, and reliable sensing technology to monitor line status.
Environmental Conditions for Operation
The Three-Position Vacuum Circuit Breaker is engineered for challenging environments:
- Ambient Temperature: -25°C to +40°C
- Relative Humidity: Daily average <95%, monthly average <90%
- Altitude: ≤1000 meters (Derating or recalculation required above 1000m)
- Seismic Intensity: ≤8 degrees
- Pollution-Free Conditions: No explosive, chemically corrosive, or high-vibration environments
Alt: “Three-Position Vacuum Circuit Breaker installed in a dust-free indoor power distribution room”
Cabinet Compatibility
The breaker is suitable for various types of switchgear, including:
- Small fixed cabinets
- Ring main units (RMU)
- Compact box-type substations
It can be mounted in standard or reversed orientations depending on cabinet design. The operating mechanisms, interlocks, and actuators are positioned in the front for convenient maintenance and operation.
Advantages of the Three-Position Vacuum Circuit Breaker
- Enhanced Operator Safety: Visible isolating breaks, door interlocks, and non-contact live display sensors ensure personnel safety.
- Maintenance-Free Design: Solid-sealed poles and reliable mechanisms extend the lifespan and reduce maintenance costs.
- Compact and Modular: The space-saving frame structure enables high-performance integration in small enclosures.
- Remote Control Capability: Supports both manual and motorized spring operation for smart grid compatibility.
- High Mechanical & Electrical Durability: Ideal for frequent operations, multiple short-circuit interruptions, and harsh environments.
The Three-Position Vacuum Circuit Breaker represents a next-generation solution in medium-voltage protection technology. Combining modular construction, vacuum arc interruption, and intelligent interlocking systems, this vacuum circuit breaker ensures safe, reliable, and long-term operation in a wide range of power systems. Its ability to integrate easily into compact cabinets and withstand demanding operational conditions makes it a valuable asset in modern electrical networks striving for safety, efficiency, and zero maintenance.
