12kV Withdrawable Indoor Circuit Breaker

The 12kV Withdrawable Indoor Circuit Breaker (Model: ZN63(VS1)-12) is a high-performance medium-voltage vacuum circuit breaker designed for three-phase AC 50Hz power distribution systems. It features an integrated operating mechanism and breaker body, providing a compact structure, excellent switching performance, and long service life. The breaker can be installed as a withdrawable unit and is fully compatible with KYN28 and other medium-voltage switchgear systems.

Designed with advanced vacuum interruption technology, the 12kV Withdrawable Indoor Circuit Breaker offers reliable protection against overloads and short circuits while supporting frequent switching operations. It is widely used in substations, industrial facilities, commercial buildings, power plants, mining operations, and infrastructure projects where dependable medium-voltage protection is required.

Product Dimensions

Product Features

• Integrated operating mechanism and breaker body for compact installation.
• Vacuum interrupter technology ensures fast arc extinction, low maintenance, and long electrical life.
• Fully encapsulated pole assembly provides maintenance-free operation and enhanced insulation reliability.
• Supports fixed and withdrawable installation configurations for flexible switchgear integration.
• High mechanical endurance with up to 10,000 operating cycles.
• Suitable for frequent switching operations in demanding industrial environments.
• Excellent insulation performance and stable dielectric strength.
• Compatible with KYN28 and other medium-voltage metal-clad switchgear.

Technical Parameters

Actual Product Photos

Structural Features

The breaker adopts a modular structure integrating the operating mechanism with the vacuum interrupter, reducing installation space while improving operational stability. The sealed vacuum interrupter effectively eliminates arc-related maintenance and delivers excellent insulation performance throughout its service life.

Its withdrawable design enables fast replacement and convenient maintenance without affecting the entire switchgear assembly, helping reduce downtime and maintenance costs in medium-voltage distribution systems.

Applications

The 12kV Withdrawable Indoor Circuit Breaker is widely applied in medium-voltage electrical systems that require reliable protection and frequent switching operations.

• Medium-voltage switchgear (KYN28 Series)
• Utility substations
• Power plants
• Industrial manufacturing facilities
• Mining operations
• Metallurgical plants
• Chemical processing facilities
• Commercial buildings
• Renewable energy projects
• Power distribution networks

Operating Environment

• Ambient temperature: -10°C to +40°C (storage down to -30°C)
• Installation altitude: Up to 1000m (higher altitude available upon request)
• Maximum seismic intensity: 8 degrees
• Suitable for environments free from fire hazards, explosion risks, corrosive gases, severe pollution, and excessive vibration.

Why Choose This Product?

• Compact withdrawable design for easy maintenance
• Maintenance-free vacuum interrupter technology
• Long mechanical and electrical service life
• Reliable insulation and switching performance
• Suitable for frequent switching operations
• Compatible with mainstream medium-voltage switchgear
• Low maintenance cost and high operational reliability

Frequently Asked Questions

What is a 12kV Withdrawable Indoor Circuit Breaker?

It is a medium-voltage vacuum circuit breaker designed to protect and control electrical equipment by interrupting overload and short-circuit currents in indoor power distribution systems.

Can this breaker be used with KYN28 switchgear?

Yes. It is fully compatible with KYN28 metal-clad switchgear and other similar medium-voltage switchgear systems.

What are the advantages of the withdrawable design?

The withdrawable structure allows quick replacement, easier maintenance, reduced downtime, and improved operational safety compared with fixed-mounted breakers.

Is this breaker suitable for frequent switching?

Yes. With a mechanical life of up to 10,000 operations and durable vacuum interrupter technology, it is designed for applications requiring frequent switching.

Which industries commonly use this product?

It is widely used in substations, power plants, industrial facilities, mining, metallurgy, chemical processing, infrastructure projects, and commercial power distribution systems.