Vacuum Circuit Breaker Manufacturer
Kampa is a China-based vacuum circuit breaker manufacturer supplying medium-voltage switching and protection equipment for industrial power distribution, switchgear production, substations and utility networks, supplying 12kV, 24kV and 40.5kV indoor and outdoor VCBs with OEM/ODM support for switchgear and power projects.
Popular Products
A vacuum circuit breaker, commonly called a VCB, interrupts load current and fault current inside a sealed vacuum interrupter. When the contacts separate, the arc is extinguished rapidly as the metal vapour inside the interrupter condenses.
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Vacuum Circuit Breaker Technical Parameters
Parameter | Available Range or Configuration |
Rated voltage | 12kV, 24kV or 40.5kV |
Rated frequency | 50Hz or 60Hz, depending on model |
Rated current | 630A–5000A |
Rated short-circuit breaking current | 20kA, 25kA, 31.5kA or 40kA |
Rated short-circuit making current | Model-dependent, typically selected according to breaking capacity |
Power-frequency withstand voltage | Model- and voltage-class-dependent |
Lightning impulse withstand voltage | Model- and voltage-class-dependent |
Mechanical endurance | Typically 10,000–20,000 operations, depending on model |
Operating mechanism | Spring-operated or permanent-magnet |
Installation type | Fixed, withdrawable, handcart or pole-mounted |
Control voltage | AC or DC control options, subject to model |
Interrupter contact material | Copper-chromium contact system |
Intelligent control | Optional protection controller, automatic reclosing and remote monitoring |
Current transformer | Optional built-in or external CT configuration |
Secondary wiring | Customized according to switchgear and control requirements |
Branding | OEM nameplate, logo and private-label options |
The final technical specification should be selected according to the system voltage, continuous current, calculated fault level, duty cycle, installation environment and switchgear interface.
What Is a Vacuum Circuit Breaker?
A vacuum circuit breaker, or VCB, is a medium-voltage switching device used to control and protect electrical circuits against overloads, short circuits and other fault conditions. Its contacts open and close inside a sealed vacuum interrupter, where the electrical arc is extinguished rapidly because there is no gas or oil to sustain it.
Vacuum circuit breakers are commonly used in 12kV, 24kV and 40.5kV power distribution systems. Their compact structure, reliable interruption performance, long mechanical life and low maintenance requirements make them suitable for switchgear, substations, industrial plants, mining facilities, renewable energy systems and railway power networks. Depending on the installation, VCBs are available in indoor, outdoor, fixed, withdrawable and pole-mounted configurations.
Key Product Advantages
Reliable Vacuum Interruption
The sealed vacuum interrupter provides rapid arc extinction and stable fault-current interruption. Copper-chromium contact materials help maintain conductivity and resistance to arc erosion during repeated switching operations.
Suitable for Frequent Operation
Selected indoor VCB series provide mechanical endurance of up to 20,000 operations, making them suitable for industrial feeders, motors, capacitor banks and other circuits with frequent switching requirements.
Compact Switchgear Integration
Fixed and withdrawable structures are available for integration into different medium-voltage panel designs. Modular operating mechanisms and sealed pole structures help reduce installation space and simplify assembly.
Low Routine Maintenance
The interrupter is sealed from external dust and contamination. This reduces routine servicing requirements compared with switching devices whose arc-extinguishing medium requires regular inspection or replacement.
Indoor and Outdoor Configurations
The product range covers indoor switchgear applications as well as outdoor overhead distribution and substation projects.
Automation Compatibility
Selected outdoor circuit breakers can be integrated with intelligent controllers, protection functions, current and voltage signals, automatic reclosing and remote-control systems.
Applications
Automation Equipment Manufacturers
VCBs can be integrated into automated distribution equipment, feeder control systems, protection cabinets and remote monitoring solutions.
Switchgear Manufacturers and Panel Buildersv
Fixed, handcart and withdrawable models are available for integration into air-insulated and metal-clad switchgear.
Power Plants and Substations
Vacuum circuit breakers are used for feeder protection, transformer switching, bus section control and fault isolation.
Industrial Manufacturing
Suitable for steel plants, chemical facilities, machinery factories, cement plants, processing facilities and other industrial power networks.
Mining and Metallurgy
VCBs provide switching and protection for surface and underground distribution equipment, motors and industrial substations.
Renewable Energy
Outdoor and indoor models can be used in wind farms, solar power stations, collector systems and renewable-energy substations.
Rail and Transportation
Medium-voltage circuit breakers can protect railway power systems, transportation infrastructure and related distribution equipment.
Commercial and Infrastructure
Applications include commercial buildings, data centres, water treatment facilities, communication infrastructure and public utility projects.
How to Select a Vacuum Circuit Breaker
1. Confirm the System Voltage: Select a breaker with a rated voltage suitable for the distribution network, such as 12kV, 24kV or 40.5kV.
2. Calculate the Continuous Load Current: The rated current of the circuit breaker must be equal to or higher than the maximum expected operating current.
3. Determine the Short-Circuit Level: The rated short-circuit breaking current must not be lower than the calculated prospective fault current at the installation point.
4. Select Indoor or Outdoor Installation: Indoor VCBs are normally installed inside switchgear panels. Outdoor VCBs are selected for pole-mounted lines, outdoor substations and exposed distribution systems.
5. Choose Fixed or Withdrawable Construction: Fixed units are suitable for compact and economical installations. Withdrawable units provide easier isolation, testing, maintenance and replacement.
6. Define the Operating Mechanism: Spring mechanisms are widely used in conventional switchgear. Permanent-magnet mechanisms are suitable for selected automation and frequent-operation applications.
7. Confirm the Control and Protection Requirements: Specify the control voltage, opening and closing coils, auxiliary contacts, protection relay interface, current transformers, reclosing functions and communication requirements.
8. Check the Installation Environment: Provide the ambient temperature, altitude, humidity, pollution level, seismic requirement and installation location. Special conditions may require adjusted insulation or structural design.
Why Choose Kampa
Our product range includes 12kV, 24kV and 40.5kV indoor and outdoor vacuum circuit breakers. Fixed, withdrawable, handcart and permanent-magnet configurations are available for automation equipment manufacturers, switchgear builders, system integrators, electrical contractors, wholesalers and overseas procurement teams.
Kampa offers high-performance medium and high-voltage power distribution solutions that combine reliability, efficiency, and competitive pricing. Our products are designed to optimize performance while reducing total cost of ownership, helping your business achieve more for less.
- Competitive Pricing
- High Efficiency
- Reliable Performance
- Tailored Solutions
Industrial Power Distribution Protection Product Catalog
Kampa medium-voltage and high-voltage power transmission and distribution solutions combine advanced technology with reliable performance to meet the power needs of various industries and cities.
- Master all models and series
- Voltage rating, capacity, size, and other data
- Guide product selection in different environments
- Comparison of product performance
Get in Touch with Our Sales & Technical Team
- +86 0577-62729846
- 13362788157
- 8613757786841
- sales@elexpert.cn
- Address: No. 20, Yaming Road, Xiangyang Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province
FAQ
What voltage ratings are available?
What is the difference between an indoor and outdoor VCB?
Can you supply fixed and withdrawable vacuum circuit breakers?
Yes. Fixed, withdrawable and handcart configurations are available depending on the series and switchgear design.
Do you support OEM and ODM orders?
Yes. OEM and ODM support can include customized ratings, operating mechanisms, secondary circuits, mounting interfaces, nameplates, logos and packaging.
Can the VCB be integrated into automated distribution equipment?
Selected models support protection controllers, current and voltage signals, automatic reclosing, remote control and communication interfaces. The exact configuration must be confirmed during technical review.
Do you supply vacuum circuit breakers for wholesale and export?
Yes. KAMPA supports wholesalers, distributors, exporters, system integrators, switchgear manufacturers and overseas purchasing teams with batch production and export-trade coordination.
Request a Vacuum Circuit Breaker Technical Proposal
Send your system voltage, rated current, short-circuit level, installation type, control voltage, required quantity and switchgear information.
Our team will review the application and recommend a suitable indoor or outdoor vacuum circuit breaker configuration for your equipment or power-distribution project.