24kV Side Mounted Vacuum Circuit Breaker

The 24kV Side Mounted Vacuum Circuit Breaker (Model: ZN63A (VS1)-24) is a high-performance indoor medium-voltage circuit breaker designed for three-phase AC 50Hz power systems with a rated voltage of 24kV. It integrates the operating mechanism and vacuum interrupter into a compact structure, providing reliable protection, switching, and control for substations, power plants, industrial facilities, and power distribution systems. The breaker is available in both fixed-mounted and withdrawable versions to meet various switchgear configurations.

Featuring advanced vacuum interruption technology, high mechanical endurance, and low maintenance requirements, this circuit breaker is ideal for applications involving frequent switching operations. It is widely used in metallurgy, mining, chemical plants, coal industries, utility substations, and renewable energy projects where safe and dependable power distribution is essential.

Product Appearance

Dimensions Diagram

Model Identification

• 1 – Rated Short-Circuit Breaking Current (kA)
• 2 – Rated Current (A)
• 3 – Operating Mechanism
• 4 – Rated Voltage (kV)
• 5 – Design Series
• 6 – Indoor Vacuum Circuit Breaker

Product Features

• Integrated side-mounted operating mechanism with compact design and reliable transmission.
• High-performance vacuum interrupter with copper-chromium contacts ensures excellent arc extinguishing capability and extended electrical life.
• Horizontally arranged spring operating mechanism supports both manual and motor charging.
• The 24kV Side Mounted Vacuum Circuit Breaker can be installed as a fixed type or withdrawable type to suit different switchgear systems.
• High dielectric insulation strength, low current chopping, and excellent short-circuit interruption performance.
• Solid epoxy insulation provides outstanding resistance to moisture, UV radiation, temperature changes, aging, and pollution.
• Mechanical life up to 10,000 operations, making it suitable for frequent switching applications.
• Supports intelligent protection relays and substation automation systems.

Technical Parameters

Structural Design

The circuit breaker adopts a three-phase pole structure equipped with a center-sealed ceramic or glass vacuum interrupter. Copper-chromium contacts and longitudinal magnetic field technology effectively reduce contact erosion while improving dielectric recovery and interrupting performance. The integrated spring operating mechanism delivers stable opening and closing operations with minimal maintenance throughout its service life.

Depending on application requirements, the poles can be manufactured using high-strength epoxy resin insulation or silicone rubber-coated insulation, providing superior resistance to humidity, condensation, UV exposure, and harsh industrial environments.

Applications

The 24kV Side Mounted Vacuum Circuit Breaker is widely used in medium-voltage distribution systems requiring reliable protection, frequent operation, and long service life.

• Power plants
• Electrical substations
• Industrial power distribution systems
• Mining operations
• Metallurgical plants
• Chemical processing facilities
• Coal industry
• Renewable energy projects
• Commercial and municipal power networks
• Smart substations and automation systems

Operating Environment

• Ambient temperature: -15°C to +40°C
• Installation altitude: Up to 1000m (higher altitudes available upon request)
• Maximum seismic intensity: 8 degrees
• Relative humidity: Daily average ≤95%, monthly average ≤90%
• Suitable for environments free from fire hazards, explosion risks, severe pollution, corrosive gases, and excessive vibration.

Working Principle

The 24kV Side Mounted Vacuum Circuit Breaker uses a sealed vacuum interrupter as the arc-extinguishing medium. When fault currents occur, the contacts separate rapidly, and the vacuum chamber extinguishes the electric arc almost instantly, providing fast fault isolation with minimal contact wear. Combined with the spring operating mechanism, the breaker delivers reliable switching performance, high interrupting capacity, and long-term operational stability.

Why Choose This Vacuum Circuit Breaker?

• Compact integrated side-mounted design
• Long electrical and mechanical service life
• Maintenance-friendly construction
• Excellent insulation performance
• Reliable operation under frequent switching conditions
• Suitable for fixed and withdrawable switchgear
• Compatible with intelligent protection and automation systems

Frequently Asked Questions

What is a 24kV Side Mounted Vacuum Circuit Breaker used for?

It is used to switch, protect, and control medium-voltage electrical equipment in substations, industrial plants, utility distribution systems, and commercial power networks.

What are the advantages of a vacuum circuit breaker?

Vacuum circuit breakers provide excellent arc interruption, low maintenance requirements, long service life, high operational reliability, and environmentally friendly operation without oil or SF6 gas.

Can this circuit breaker be installed in withdrawable switchgear?

Yes. It is available in both fixed-mounted and withdrawable configurations, allowing flexible integration into various switchgear assemblies.

Which industries commonly use this product?

It is widely used in power generation, substations, metallurgy, mining, chemical processing, coal industries, renewable energy facilities, and industrial power distribution systems.