Products Description
What is a switchgear ?
Electrical switchgear, also known as complete switchgear or distribution panels, serves as the core node equipment for power distribution and control within substation systems. It is a complete electrical assembly that integrates components such as circuit breakers, disconnect switches, load switches, and fuses into enclosed or semi-enclosed metal cabinets according to specific wiring requirements. Positioned as a critical hub between the power generation side and the consumption side, it undertakes core functions including power distribution, control, protection, and monitoring.
About us
LVMA has been designing and manufacturing medium voltage switchgear for 21 years，Our AIS, GIS, and solid-insulated switchgear meetIEC 62271 and CE standards -tested, certified, and delivered directly from our50,000 m2 factory.
Serving 200+ enterprise clients across 40+ countries.....
How to Choose MV Switchgear
The insulation inside a switchgear is the core. which determines size, safety, and durability
12kV·24kV·40.5kV ｜ AIS·GIS·SIS ｜ Custom Solutions in 10 Days
Air-Insulated Switchgear (AIS)
people also call it Metal-Clad Switchgear
It uses air gaps inside a solid metal cabinet for insulation. The breaker can be rolled out easily for safe, quick service. Choose AIS for main power rooms where access and proven reliability matter most.
Gas-Insulated Switchgear (GIS)
Compact & rugged. Sealed metal tank with insulating gas. Small, dust-proof, maintenance-free. Ideal for tight spaces, harsh sites and critical networks.SF6 enables ultra-compact design but is a strong greenhouse gas, so the industry is shifting to eco-friendly alternatives.
Solid-Insulated Switchgear (SIS)
The modern, green choice. Key components are cast in solid epoxy resin. It runs without any insulating gas, making it incredibly tough and gentle on the planet. This makes it the clear next-generation choice for sustainable sites and tough operating environments.
Voltage level classification
12 kV series
Safe and stable, with extremely strong adaptability
24 kV series
Reliable performance and high protection level
40.5 kV series
With high insulation, large capacity and high protection features
Make customers feel confident when making a purchase
Featured switchgear
Explore our comprehensive range of standard switchgear, delivering exceptional performance across a wide array of parameters. Should our standard offerings not fully meet your specific requirements, our expert team stands ready to provide tailored switchgear solutions for your power system.
Performance advantage
Zhejiang Lvma medium voltage switchgear adopts advanced modular design and high-quality vacuum switch components, providing superior safety, stability and durability for modern medium-voltage power distribution systems. With strict IEC standard manufacturing, the whole switchgear achieves excellent comprehensive performance in industrial, commercial and utility power grid applications.
It features outstanding short-circuit withstand capability and stable breaking performance, ensuring reliable operation under long-term full-load operation and frequent switching conditions. The fully sealed cabinet structure effectively prevents dust, moisture and condensation, adapting to complex indoor working environments and greatly extending equipment service life.
Equipped with complete mechanical and electrical interlock protection, the switchgear avoids misoperation and ensures maximum safety for equipment and operators. Its compact and reasonable layout saves installation space, while standardized modular structure simplifies installation, maintenance and later system expansion. With low failure rate and minimal maintenance requirements, our medium voltage switchgear delivers high efficiency and cost-effective power distribution solutions for global projects.
Compliance & Industry Standards
Our medium‑voltage switchgear is fully designed, tested and manufactured in accordance with the latest IEC international standards, ensuring consistent performance and global project adaptabilityIEC Websto....
Our metal‑enclosed switchgear assembly complies with IEC 62271‑200, the core standard for AC metal‑enclosed high‑voltage switchgear covering rated voltages from 1 kV up to 52 kV, which specifies requirements for mechanical structure, internal arc resistance, insulation performance and type‑test verification. The matched vacuum circuit breakers conform to IEC 62271‑100, meeting strict criteria for breaking capacity, mechanical endurance and electrical life. Earthing switches and disconnectors follow IEC 62271‑102, while protection and measuring components comply with relevant IEC 61869 series standards for instrument transformersEaton.
All units undergo full‑type tests including dielectric test, short‑time withstand current test, internal arc test and mechanical operation test. Strict standard compliance guarantees equipment safety, reliability and interchangeability for utility grids, industrial plants and large‑scale infrastructure projects worldwide.
Technical Data
Our Electric medium‑voltage switchgear covers gas‑insulated, solid‑insulated and air‑insulated types, including metal‑clad, metal‑enclosed and ring main unit (RMU) configurations for diverse project requirements.
Rated Voltage: 12 kV, 24 kV, 40.5 kV
Rated Frequency: 50 Hz
Main Structure Type: ‑ Gas‑insulated: Fixed‑type fully sealed inflatable ring main unit, SF6‑free gas‑insulated RMU ‑ Solid‑insulated: Fixed‑type SF6‑free solid insulated ring main unit ‑ Air‑insulated: Fixed‑type metal‑enclosed cubicle‑type / box‑type; withdrawable metal‑clad switchgear
Rated Main Busbar Current: 630 A, 1250 A, 1600 A, 2000 A, 2500 A, 3150 A
Short‑time withstand current: 20 kA, 25 kA, 31.5 kA (3s / 4s)
Peak withstand current: 50 kA, 63 kA, 80 kA
Arc‑Resistant Performance: Internal arc test compliant with IEC 62271‑200 for qualified models.
Operation Mechanism: Spring‑type operating mechanism, supporting local manual operation and remote electrical control.
Interlock Function: Complete mechanical & electrical interlocks to prevent mis‑operation, satisfying “five‑prevent” safety requirements.
Insulation Medium Options: Air, eco‑friendly insulating gas, solid epoxy insulation, SF6 gas.
Installation Condition: Indoor installation for all above switchgear series.
Ambient Operating Temperature: ‑15 °C ~ +40 °C; anti‑condensation heater optional for high‑humidity sites.
Compliance Standards: ‑ IEC 62271‑200: AC metal‑enclosed and metal‑clad switchgear ‑ IEC 62271‑100: Vacuum circuit‑breaker ‑ IEC 62271‑102: Earthing switches & disconnectors ‑ IEC 62271‑201: Gas‑insulated ring‑main‑units
Core Advantages of Design
Protective features: Fully enclosed + five-segment interlocking mechanism, with no blind spots in electrical safety
Integration: Integrated layout of components, fewer failure points and greater stability
Maintainability: Modular pull-out design, making maintenance and capacity expansion extremely convenient
Compatibility: Supports multiple voltage levels and various models, covering all types of power distribution scenarios
Control and Protection Function: Integrated monitoring and protection, with rapid and accurate handling of faults
Transform Your Power Needs
► Optimize the overall design of switchgear
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Customize switchgear combinations for multiple voltage levels
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Tailor designs to specific application scenarios
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Precision manufacturing based on technical drawings
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Process and produce dedicated custom nameplates
For customized switchgear solutions, please contact LVMA
Why Choose LVMA as Your Switchgear Manufacturer
Strong R&D Capability
We have an experienced R&D team comprised of electrical engineers, process specialists, and other professionals. They continuously enhance their technical capabilities in switchgear design, material application, and manufacturing processes.
The R&D center is equipped with advanced research and testing facilities capable of performing performance testing, reliability verification, environmental simulation, and other tasks.
Exceptional Quality Control
The switches manufactured by our factory have obtained international authoritative certifications such as CE and IEC. Before leaving the factory, all products undergo a series of rigorous tests including main circuit insulation resistance testing, power frequency withstand voltage testing, energization testing, and protective function testing.
Efficient Manufacturing
With our highly trained workforce and state-of-the-art manufacturing facilities, we can complete switchgear production in as little as 10 days and ship directly from the factory.
Proven Expertise, Customized Solutions
LVMA has 21 years of experience in providing successful power solutions for various industries. We are a reliable manufacturer of switches that integrates R&D, production and sales. Whether it's complex industrial applications or customized power distribution projects, we can ensure that we provide you with effective solutions and professional technical guidance.
Buying Guide
When selecting medium‑voltage switchgear, multiple key factors shall be evaluated to match your actual power distribution project requirements. Zhejiang Lvma Electric offers air‑insulated, gas‑insulated and solid‑insulated switchgear including RMU, metal‑enclosed and metal‑clad series for flexible selection.
1. Confirm System Electrical Parameters
Clarify your project rated voltage: 12kV, 24kV or 40.5kV. Define rated busbar current and short‑circuit withstand current according to grid capacity and fault level. These core values determine cabinet type, vacuum breaker specification and busbar configuration.
2. Choose Insulation & Cabinet Structure
Air‑Insulated Switchgear: Cost‑effective solution. Select fixed‑type metal‑enclosed for simple ring‑network projects; pick withdrawable metal‑clad type for heavy‑load, frequent‑maintenance industrial and substation applications.
Gas‑Insulated RMU: Fully sealed compact design. Ideal for limited‑space sites, urban power networks. SF6‑free version is recommended for projects with environmental‑protection requirements.
Solid‑Insulated RMU: Adopts epoxy solid insulation, free of SF6 gas. Suitable for humid, high‑pollution working conditions with strict eco‑friendly standards.
3. Evaluate Working Environment & Installation Conditions
All these series are designed for indoor installation. For high‑humidity, dusty or condensation‑prone locations, order anti‑condensation heaters and enhanced sealing options. Check site floor space: compact gas/solid‑insulated RMUs save more room than conventional air‑insulated cabinets.
4. Define Functional Requirements
Confirm incoming‑outgoing loop quantity, protection scheme, local/remote control demand. Full mechanical and electrical five‑prevent interlock is standard supply. Specify if you need earthing switch, metering module or monitoring accessories.
5. Standards & Customization
All products comply with relevant IEC standards. If standard models cannot satisfy your project, our engineering team supports non‑standard customization for cabinet layout, parameter adjustment and auxiliary configuration.
Important Reminder:
The above guidance serves as general reference. Share your single‑line diagram and site conditions with our sales team, we will provide targeted model recommendation and quotation.
FAQ
Q: Can the switchgear be expanded? What should be noted when expanding it?
A: The modular designed switchgear can be expanded as needed. Before expansion, it is necessary to confirm the remaining capacity of the busbar and the space of the cabinet. The operation should be carried out by professionals to ensure that the overall parameters match after expansion and comply with safety regulations.
Q: What key points should be noted during the daily operation and maintenance of switch cabinets?
A: ① Regularly clean the interior of the cabinet to prevent dust accumulation; ② Tighten the connection terminals to prevent poor contact and overheating; ③ Test the insulation resistance and grounding resistance to ensure the values meet the standards; ④ Verify the effectiveness of the five-prevention interlock function and prohibit unauthorized short-circuiting.
Q: What core tests will be conducted on the switch cabinets before they are manufactured?
A: Insulation, withstand voltage, mechanical operation, grounding, wiring / Visual inspection.
Q: What parameters need to be provided for customization?
A: Voltage / Current, Short-circuit Capacity, Scenario, Function, Circuit Number, Installation Size.
Q: How long is the service life?
A: Typically, it lasts for 15 to 20 years. For regular maintenance, it can be extended to around 25 years.
Q: How to choose between the pull-out type and the fixed type?
A: Removable design for easy maintenance, suitable for high-frequency operation and maintenance; Fixed design has lower cost, suitable for simple power distribution.
As one of the most professional manufacturers and suppliers of high-voltage switches in China, we are renowned for our high-quality products and reasonable prices. We welcome you to purchase high-voltage switchgear from our factory at any time. If you need customized design services, please contact us.