Vacuum Circuit Breaker (VCB) Manufacturer & Supplier
6 kV to 40.5 kV Vacuum Circuit Breakers for Power Distribution Systems
- Product definition: Vacuum switching and protection equipment for medium-voltage power distribution systems.
- Usage: substations, feeder protection, renewable energy collection and industrial distribution.
- Advantages: compact structure, reliable breaking performance, low maintenance and long service life.
Vacuum Circuit Breaker Selection Guide
Voltage
6 kV to 40.5 kV
Current
630 A to 2500 A
Breaking
20 kA to 31.5 kA
Standard
IEC 62271-100
Vacuum Circuit Breaker Product Models & Ratings
Compare indoor and outdoor vacuum circuit breakers by voltage rating, rated current, short-circuit breaking current, and installation type. Select the configuration that matches your utility, industrial, or EPC project requirements.
Vacuum Circuit Breaker (VCB)
Outdoor vacuum circuit breaker for 33 kV distribution projects, with selection based on substation switching duties, rated current, and short-circuit breaking requirements.
11 kV Vacuum Circuit Breaker
11 kV outdoor vacuum circuit breaker for distribution feeders. Confirm the operating mechanism, installation arrangement, and control requirements against your project specification.
Vacuum Circuit Breaker
35 kV vacuum circuit breaker for outdoor substation projects. Compare the listed current rating, short-circuit breaking current, and required insulation level.
33 kV Vacuum Circuit Breaker
33 kV outdoor vacuum circuit breaker for utility and industrial distribution feeders. Match the rated current and breaking capacity to your project requirements.
Substation Vacuum Circuit Breaker
Substation vacuum circuit breaker for medium-voltage switching and protection. Confirm the operating sequence, auxiliary power supply, and protection interfaces for your project.
Vacuum Switchgear
Vacuum switching equipment for medium-voltage distribution projects. Confirm the breaker configuration, control cabinet, and installation arrangement against your technical specification.
Vacuum Circuit Breaker (VCB) Technical Parameter
Key parameters including rated voltage, rated current, breaking capacity and electrical performance data.
Outdoor Vacuum Circuit Breaker Technical Specifications
Table 1 – Main Technical Parameters
| Parameter | Unit | 6 kV | 11 kV | 20 kV | 33 kV | 35 kV |
|---|---|---|---|---|---|---|
| Rated Voltage (Ur) | kV | 7.2 | 12 | 24 | 36 | 40.5 |
| Rated Frequency | Hz | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 |
| Rated Normal Current | A | 630 – 1250 | 630 – 1250 | 1250 – 1600 | 1250 – 2000 | 1250 – 2500 |
| Rated Short-Circuit Breaking Current | kA | 20 / 25 | 20 / 25 / 31.5 | 20 / 25 / 31.5 | 25 / 31.5 | 31.5 |
| Number of Operations at Rated Short-Circuit Breaking Current | operations | 20 / 30 | 20 / 30 | 20 / 30 | 20 / 30 | 20 / 30 |
| Main Circuit Resistance | μΩ | ≤60 | ≤60 | ≤80 | ≤100 | ≤100 |
| Rated Short-Time Withstand Current | kA | 20 / 25 | 20 / 25 / 31.5 | 20 / 25 / 31.5 | 25 / 31.5 | 31.5 |
| Rated Short-Circuit Duration | s | 3 / 4 | 3 / 4 | 3 / 4 | 3 / 4 | 3 / 4 |
| Rated Peak Withstand Current | kA peak | 50 / 63 | 50 / 63 / 80 | 50 / 63 / 80 | 63 / 80 | 80 |
Table 2 – Insulation Levels
| Parameter | Unit | 6 kV | 11 kV | 20 kV | 33 kV | 35 kV |
|---|---|---|---|---|---|---|
| Rated Voltage (Ur) | kV | 7.2 | 12 | 24 | 36 | 40.5 |
| Power-Frequency Withstand Voltage (1 min) | kV rms | 20 | 28 | 50 | 95 | 95 |
| Lightning Impulse Withstand Voltage | kV peak | 60 | 75 | 125 | 170 | 195 |
| External Insulation | — | Porcelain / Polymeric Insulation | Porcelain / Polymeric Insulation | Porcelain / Polymeric Insulation | Porcelain / Polymeric Insulation | Porcelain / Polymeric Insulation |
| Reference Installation Altitude (Other Altitudes Available on Request) | m | ≤2000 | ≤2000 | ≤2000 | ≤2000 | ≤2000 |
Table 3 – Mechanical & Operating Characteristics
| Parameter | Unit | 6 kV | 11 kV | 20 kV | 33 kV | 35 kV |
|---|---|---|---|---|---|---|
| Operating Mechanism | — | Motor-Charged Spring / Permanent-Magnet Operating Mechanism | Motor-Charged Spring / Permanent-Magnet Operating Mechanism | Motor-Charged Spring / Permanent-Magnet Operating Mechanism | Motor-Charged Spring Mechanism | Motor-Charged Spring Mechanism |
| Outdoor Configuration | — | Pole-Mounted / Live-Tank | Pole-Mounted / Live-Tank | Pole-Mounted / Live-Tank | Pole-Mounted / Live-Tank | Pole-Mounted / Live-Tank |
| Opening Time | ms | 30–60 | 30–60 | 30–60 | 30–60 | 30–60 |
| Closing Time | ms | 50–100 | 50–100 | 50–100 | 50–100 | 50–100 |
| Mechanical Endurance Class | — | M2 | M2 | M2 | M2 | M2 |
| Mechanical Endurance (Model Dependent) | operations | 10000 | 10000 | 10000 | 10000 | 10000 |
| Closing Coil Rated Voltage | V DC | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 |
| Trip Coil Rated Voltage | V DC | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 |
| Motor Supply Voltage | V | 36 / 110 / 220 DC or 220 AC | 36 / 110 / 220 DC or 220 AC | 36 / 110 / 220 DC or 220 AC | 36 / 110 / 220 DC or 220 AC | 36 / 110 / 220 DC or 220 AC |
Indoor Vacuum Circuit Breaker Technical Specifications
Table 1 – Main Technical Parameters
| Parameter | Unit | 6 kV | 11 kV | 20 kV | 33 kV | 35 kV |
|---|---|---|---|---|---|---|
| Rated Voltage (Ur) | kV | 7.2 | 12 | 24 | 36 | 40.5 |
| Rated Frequency | Hz | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 |
| Rated Normal Current | A | 400 – 2500 | 630–4000 | 630–3150 | 630–3150 | 630–2500 |
| Rated Short-Circuit Breaking Current | kA | 20 / 25 / 31.5 / 40 | 20 / 25 / 31.5 / 40 / 50 | 20 / 25 / 31.5 / 40 | 25 / 31.5 / 40 | 25 / 31.5 |
| Number of Operations at Rated Short-Circuit Breaking Current | operations | 30 / 50 | 30 / 50 | 30 / 50 | 20 / 30 | 20 / 30 |
| Main Circuit Resistance | μΩ | ≤40 | ≤40 | ≤50 | ≤70 | ≤70 |
| Rated Short-Time Withstand Current | kA | 20 / 25 / 31.5 / 40 | 20 / 25 / 31.5 / 40 / 50 | 20 / 25 / 31.5 / 40 | 25 / 31.5 / 40 | 25 / 31.5 |
| Rated Short-Circuit Duration | s | 3 / 4 | 3 / 4 | 3 / 4 | 3 / 4 | 3 / 4 |
| Rated Short-Circuit Making Current | kA peak | 50 / 63 / 80 / 100 | 50 / 63 / 80 / 100 / 125 | 50 / 63 / 80 / 100 | 63 / 80 / 100 | 63 / 80 |
Table 2 – Insulation Levels
| Parameter | Unit | 6 kV | 11 kV | 20 kV | 33 kV | 35 kV |
|---|---|---|---|---|---|---|
| Rated Voltage (Ur) | kV | 7.2 | 12 | 24 | 36 | 40.5 |
| Power-Frequency Withstand Voltage (1 min) | kV | 20 | 42 | 50 | 70 | 95 |
| Lightning Impulse Withstand Voltage | kV peak | 60 | 75 | 125 | 170 | 185 |
| Insulation Medium | — | Air / Solid Insulation | Air / Solid Insulation | Air / Solid Insulation | Air / Solid Insulation | Air / Solid Insulation |
| Reference Installation Altitude (Higher Altitudes Available on Request) | m | ≤2000 | ≤2000 | ≤2000 | ≤2000 | ≤2000 |
Table 3 – Mechanical & Operating Characteristics
| Parameter | Unit | 6 kV | 11 kV | 20 kV | 33 kV | 35 kV |
|---|---|---|---|---|---|---|
| Operating Mechanism | — | Motor-Charged Spring Stored-Energy Mechanism | Motor-Charged Spring Stored-Energy Mechanism | Motor-Charged Spring Stored-Energy Mechanism | Motor-Charged Spring Stored-Energy Mechanism | Motor-Charged Spring Stored-Energy Mechanism |
| Mounting Type | — | Fixed / Withdrawable | Fixed / Withdrawable | Fixed / Withdrawable | Fixed / Withdrawable | Fixed / Withdrawable |
| Opening Time | ms | 30–50 | 30–50 | 30–50 | 30–50 | 30–50 |
| Closing Time | ms | 50–80 | 50–80 | 50–80 | 50–80 | 50–80 |
| Mechanical Endurance Class | — | M2 | M2 | M2 | M2 | M2 |
| Mechanical Endurance (Model Dependent) | operations | 10,000 / 20,000 | 10,000 / 20,000 | 10,000 / 20,000 | 10,000 / 20,000 | 10,000 / 20,000 |
| Closing Coil Rated Voltage | V DC | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 |
| Trip Coil Rated Voltage | V DC | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 | 110 / 220 |
| Motor Supply Voltage | V | 110 / 220 DC or 220 AC | 110 / 220 DC or 220 AC | 110 / 220 DC or 220 AC | 110 / 220 DC or 220 AC | 110 / 220 DC or 220 AC |
| Auxiliary Contacts | — | Customizable | Customizable | Customizable | Customizable | Customizable |
Vacuum Circuit Breaker Features & Procurement Considerations
Compare vacuum interruption, operating mechanisms, insulation arrangements and maintenance access when specifying a VCB for your distribution project.
Vacuum Interruption & Arc Extinction
Utilizes high-grade vacuum interrupters (VI) to rapidly extinguish electrical arcs at current zero, leveraging high dielectric strength for reliable medium-voltage circuit interruption.
Electrical Ratings, Short-Circuit Breaking Capacity & Protection Coordination
Engineered with high rated currents and short-circuit breaking capacities (Icu/Ics), seamlessly integrating with relay protection for optimal selectivity and system coordination.
Spring Operating Mechanism & Switching Sequence
Features a robust spring energy-storage operating mechanism designed for standard duty cycles (O-C-O), ensuring precise switching sequences and rapid response.
Epoxy Insulation & Creepage Distance Selection
Utilizes premium APG embedded epoxy resin insulation with optimized creepage distance, ensuring superior dielectric strength and high tracking resistance in harsh environments.
Withdrawable Circuit Breaker Dimensions & Switchgear Interfaces
Standardized withdrawable truck-mounted design with precise dimensions and main contact interfaces, ensuring perfect compatibility with modular MV switchgear panels.
Mechanical Endurance & Electrical Switching Life
Complies with IEC Class M2 mechanical endurance (up to 10,000 operations) and Class E2 electrical life, minimizing maintenance and maximizing operational longevity.
Racking-In Mechanism & Front Maintenance Access
Features an ergonomic racking mechanism with clear test/service position indicators and safety interlocks, enabling hassle-free front-access inspection and maintenance.
Indoor/Outdoor Operating Conditions & Procurement Specs
Engineered to meet versatile indoor switchgear and outdoor pole-mounted environmental conditions, backed by comprehensive engineering specifications and procurement data sheets.
Vacuum Circuit Breaker Applications & Industries Served
Review switching and protection duties in medium-voltage distribution systems. Confirm each application against the selected breaker ratings, operating sequence and site conditions.
Substation
Vacuum circuit breakers for feeder switching and protection in utility and industrial substations. Coordinate rated current, short-circuit breaking duty and protection interfaces.
Solar Power Plants
VCB equipment for photovoltaic collection networks and substation feeders. Confirm the protection scheme, operating sequence and grid-connection requirements.
Thermal Power Plants
Vacuum circuit breakers for medium-voltage auxiliary distribution in power-generation facilities. Match the breaker configuration to the approved single-line diagram.
Power Distribution Networks
Indoor or outdoor vacuum circuit breakers for distribution feeders. Confirm the mounting arrangement, control supply and remote-control interfaces.
Wind Farms
VCB switching equipment for wind-farm collection circuits and substation interfaces. Check installation conditions, fault duty and protection coordination.
Energy Storage Power Stations
Vacuum circuit breakers for medium-voltage distribution in energy-storage projects. Coordinate switching duties, interlocks and protection settings with the system design.
Vacuum Circuit Breaker Technical Review, Verification & Project Delivery
Confirm the VCB configuration, manufacturing inspections, verification documents and commercial delivery requirements before placing an order. Final details must be agreed for the selected equipment.
Manufacturing and Factory Acceptance Testing (FAT)
Agree the inspection and test plan before manufacturing. Review assembly records, wiring, mechanical operation, interlocks, main-circuit resistance and applicable dielectric tests. A project-specific FAT can include buyer witness points, acceptance criteria and signed records. 【Manual-add-here: production photos, inspection records and approved VCB FAT scope】
Technical Review
Review the selected vacuum circuit breaker against the purchaser specification and applicable IEC 62271-100 requirements. Confirm the equipment voltage, rated current, short-circuit breaking current, operating sequence, mechanism, auxiliary supply and installation conditions. 【待站长填写：technical reviewer name, qualifications, review date and approved model scope】
Third-Party Verification
Verify the issuing laboratory, report number, test standard and exact tested configuration before using a report for project approval. Evidence for another product or rating does not establish coverage for the offered equipment. 【待站长填写：verified laboratory, report number and model-to-report mapping】 【Manual-add-here: applicable test reports and verification links】
Commercial and Project Delivery Terms
Confirm the quotation scope, MOQ, payment terms, warranty, spare parts, packaging, shipping arrangements and after-sales support in the project agreement. Production and document schedules depend on the approved configuration and order requirements. 【待站长填写：approved commercial terms, delivery schedule and service commitments】
Planning a vacuum circuit breaker project? Send the single-line diagram, electrical ratings, operating sequence, mechanism requirements, site conditions, quantities and destination for technical and commercial review.
Vacuum Circuit Breaker FAQ - Technical & Purchasing Questions
Answers covering equipment selection, configuration, installation conditions, testing documents and project delivery.
Confirm the equipment rated voltage, continuous current, short-circuit breaking current, operating sequence and installation type. Check the mechanism, control supply and interfaces against the selected VCB data sheet. Nominal network voltage and equipment rated voltage must be distinguished.
Provide the required dimensions, protection functions, control voltages, interfaces and nameplate requirements. Customization and OEM scope must be confirmed in the technical offer before an order is accepted.
The schedule depends on the approved configuration, quantity, document review and inspection requirements. Obtain a written production and shipment schedule for the specific order.
Request the approved data sheet, general arrangement drawing, wiring information, installation instructions, routine test records and applicable type-test evidence. Agree the exact submission list and FAT documentation in the contract.
Confirm indoor or outdoor suitability, ambient temperature, altitude, humidity, pollution and installation space. Verify the breaker insulation, mounting arrangement and enclosure requirements for the project environment.
Send the single-line diagram, equipment ratings, circuit configuration, protection requirements, site conditions, quantities, destination and required documents. Include any deviations from the standard configuration for review.
Vacuum Circuit Breaker Technical Articles & Insights
Use these technical articles to understand operating principles, compare configurations, and prepare a more complete project specification before requesting a quotation.
What Is a Vacuum Circuit Breaker? Operating Principle and Applications
An introduction to vacuum circuit breaker operation, common configurations and information needed for project selection.
Vacuum Circuit Breaker Working Principle Explained
Review how a vacuum interrupter extinguishes the arc and what project data should be confirmed before selecting a VCB.
Vacuum Circuit Breaker Diagram: Parts & Structure
Review the main parts and structural arrangement of a vacuum circuit breaker before preparing a technical enquiry.