Medium Voltage Switchgear & Air Insulated Switchgear Manufacturer
Baocheng Electrical manufactures medium voltage switchgear and air insulated switchgear (AIS) panels from 11KV to 33KV. IEC 62271-200 compliant, for substations and industrial use. Get a free quote today.
Medium Voltage Switchgear for Power Distribution Projects
Compare medium voltage switchgear for utility substations, industrial distribution and EPC projects. Options include air-insulated switchgear (AIS), gas-insulated switchgear (GIS), ring main units (RMU) and solid-insulated switchgear. Select the assembly against the system voltage, busbar current, short-circuit duty, protection scheme and installation environment. Confirm the final configuration, applicable test evidence and project documents before ordering.
- Product range: AIS, GIS, RMU and solid-insulated medium voltage switchgear.
- Applications: substations, industrial distribution and renewable-energy projects.
- Selection: confirm the panel arrangement, protection scheme, ratings and project documentation.
Medium Voltage Switchgear Selection Guide
Insulation
AIS / GIS / SIS
Current
Confirm by panel configuration
Fault Duty
Confirm withstand and breaking ratings
Assembly Standard
IEC 62271-200; verify report scope
Medium-Voltage Switchgear Product Range
Compare medium-voltage switchgear options, including metal-clad panels, vacuum circuit breaker switchgear, gas-insulated switchgear, and ring main units. Match electrical ratings, circuit configurations, and installation requirements to your project.
11 kV Metal-Clad Switchgear
11 kV metal-clad switchgear for substation and industrial power distribution. Confirm busbar ratings, circuit configuration, and cable connections against your project requirements.
11 kV VCB Switchgear
11 kV vacuum circuit breaker switchgear for feeder switching and protection. Specify the protection relay, auxiliary power supply, and operating requirements for your installation.
11 kV SF6 Ring Main Unit
11 kV SF6 ring main unit for secondary distribution networks. Select incoming, outgoing, and transformer protection functions to match your single-line diagram.
24 kV SF6 Gas-Insulated Switchgear
33 kV gas-insulated switchgear for utility and industrial substations. Match the busbar rating, short-time withstand current, and protection scheme to your system requirements.
33 kV Gas-Insulated Switchgear
33 kV gas-insulated switchgear for utility and industrial substations. Match the busbar rating, short-time withstand current, and protection scheme to your system requirements.
40.5 kV Switchgear
40.5 kV switchgear for substation and industrial power distribution. Confirm insulation levels, switching device ratings, and installation clearances against your technical specification.
Medium-Voltage Switchgear Technical Specifications | Air Insulation · Gas Insulation · Solid Insulation
Key parameters including rated voltage, rated current, breaking capacity and electrical performance data.
I. Air-Insulated Switchgear (AIS) — Main Ratings
| Technical Parameter | Unit | 7.2 kV Class | 12 kV Class | 24 kV Class | 40.5 kV Class |
|---|---|---|---|---|---|
| Typical Nominal System Voltage | kV | 6/6.6 | 10/11 | 20/22 | 33/35 |
| Rated Frequency | Hz | 50/60 | 50/60 | 50/60 | 50/60 |
| Rated Busbar Current | A | 4000 | 4000 | 3150 | 3150 |
| Circuit-Breaker Short-Circuit Breaking Current | kA r.m.s. | 40 | 40 | 31.5 | 25/31.5 |
| Rated Duration of Short-Circuit | s | 3 | 3 | 3 | 4 |
| Rated Peak Withstand Current (50 Hz) | kA peak | 100 | 100 | 80 | 63/80 |
| Rated Short-Duration Power-Frequency Withstand Voltage (Phase-to-Earth / Between Phases) | kV r.m.s. | 20 | 28 | 50 | 95 |
| Rated Lightning Impulse Withstand Voltage (Phase-to-Earth / Between Phases) | kV peak | 60 | 75 | 125 | 185 |
| Main-Circuit Insulation / Arc-Interruption Medium | — | Air insulation / Vacuum interruption | Air insulation / Vacuum interruption | Air insulation / Vacuum interruption | Air insulation / Vacuum interruption |
| Installation Arrangement | — | Indoor, metal-enclosed, floor-mounted | Indoor, metal-enclosed, floor-mounted | Indoor, metal-enclosed, floor-mounted | Indoor, metal-enclosed, floor-mounted |
| Degree of Protection of Enclosure | — | Standard: IP3XD Optional: IP4X | Standard: IP3XD Optional: IP4X | IP4X | IP4X |
| Degree of Protection Between Compartments | — | IP2X | IP2X | IP2X | IP2X |
| Service Conditions in Reference Catalogue | — | Rated current based on a maximum of 40 °C / daily average of 35 °C; verify derating at higher temperatures | Rated current based on a maximum of 40 °C / daily average of 35 °C; verify derating at higher temperatures | −5 to +40 °C; altitude ≤1000 m | −15 to +40 °C; altitude ≤1000 m |
| Assembly / Common Standards | — | IEC 62271-200 IEC 62271-1 | IEC 62271-200 IEC 62271-1 | IEC 62271-200 IEC 62271-1 | Confirm IEC type-test coverage for the 40.5 kV version; S04 lists both IEC and GB versions |
| Main Component and Enclosure Protection Standards | — | Circuit-breakers: IEC 62271-100 Disconnectors / earthing switches: IEC 62271-102 Degrees of protection: IEC 60529 | Circuit-breakers: IEC 62271-100 Disconnectors / earthing switches: IEC 62271-102 Degrees of protection: IEC 60529 | Circuit-breakers: IEC 62271-100 Disconnectors / earthing switches: IEC 62271-102 Degrees of protection: IEC 60529 | Circuit-breakers: IEC 62271-100 Disconnectors / earthing switches: IEC 62271-102 Degrees of protection: IEC 60529 |
II. Gas-Insulated Switchgear — Main Ratings
2.1 Primary Distribution GIS
| Technical Parameter | Unit | 12 kV Class | 24 kV Class | 36 kV Class | 40.5 kV Class |
|---|---|---|---|---|---|
| Typical Nominal System Voltage | kV | 10/11 | 20/22 | 30/33 | 35 |
| Rated Frequency | Hz | 50;60 Hz | 50;60 Hz | 50;60 Hz | 50;60 Hz |
| Rated Busbar Current | A | 1250 | 1250 | 2500 | 2000 |
| Circuit-Breaker Rated Short-Circuit Breaking Current | kA r.m.s. | 25 | 25 | 31.5 | 31.5 |
| Rated Duration of Short-Circuit | s | 3 | 3 | 3 | 3 |
| Rated Peak Withstand Current | kA peak | 63 | 63 | 80 | 80 |
| Rated Short-Duration Power-Frequency Withstand Voltage (Phase-to-Earth / Between Phases) | kV r.m.s. | 28 | 50 | 70 | 95 |
| Rated Lightning Impulse Withstand Voltage (Phase-to-Earth / Between Phases) | kV peak | 75 | 125 | 170 | 185 |
| Main-Circuit Insulation / Arc-Interruption Medium | — | SF6 gas insulation / Vacuum interruption | SF6 gas insulation / Vacuum interruption | SF6 gas-insulated switching module; solid-insulated busbars; vacuum interruption | SF6 gas insulation; vacuum circuit-breaker |
| Main Switching Device Configuration | — | Fixed vacuum circuit-breaker + three-position disconnector | Fixed vacuum circuit-breaker + three-position disconnector | Fixed vacuum circuit-breaker + three-position disconnector | Fixed vacuum circuit-breaker + three-position disconnector |
| Opening / Closing / Break Time | ms | Opening ≤45; closing approx. 60; break time ≤60 | Opening ≤45; closing approx. 60; break time ≤60 | Opening ≤45; closing approx. 60; break time ≤60 | Opening ≤45; closing approx. 60; break time ≤60 |
| Loss of Service Continuity Category / Partition Class | — | Panels without fuses: LSC2 / PM Panels with fuses: LSC2A / PM | Panels without fuses: LSC2 / PM Panels with fuses: LSC2A / PM | LSC2 / PM (cited edition; units without fuses) | LSC2 / PM (cited edition; units without fuses) |
| Power-Frequency Withstand Voltage Across the Isolating Distance | kV r.m.s. | 32 | 65 | 85 | 118 |
| Lightning Impulse Withstand Voltage Across the Isolating Distance | kV peak | 85 | 145 | 195 | 215 |
| Installation Arrangement | — | Indoor, metal-enclosed, fixed installation; wall-adjacent or free-standing as specified | Indoor, metal-enclosed, fixed installation; wall-adjacent or free-standing as specified | Indoor, fixed installation; outdoor use requires a dedicated enclosure | Indoor, fixed installation; outdoor use requires a dedicated enclosure |
| Applicable Standards | — | IEC 62271-1/IEC 62271-200 IEC 62271-100/IEC 62271-102/IEC 60529 | IEC 62271-1/IEC 62271-200 IEC 62271-100/IEC 62271-102/IEC 60529 | IEC 62271-200/IEC 62271-1 | IEC 62271-200/IEC 62271-1 |
| Degrees of Protection by Compartment / Cover | — | Gas compartment: IP65; low-voltage compartment: IP4X Mechanically operated circuit-breaker front panel: IP3X | Gas compartment: IP65; low-voltage compartment: IP4X Mechanically operated circuit-breaker front panel: IP3X | Gas tank: IP67; mechanism front cover: IP2XC Cable cover: IP3X; low-voltage compartment: IP2XC | Gas tank: IP67; mechanism front cover: IP2XC Cable cover: IP3X; low-voltage compartment: IP2XC |
| Ambient Temperature / Altitude Conditions | — | −5 to +40 °C; 24 h average ≤+35 °C; altitude ≤2000 m | −5 to +40 °C; 24 h average ≤+35 °C; altitude ≤2000 m | −25 to +40 °C; 24 h average ≤+35 °C; normal service altitude ≤1500 m | −25 to +40 °C; 24 h average ≤+35 °C; normal service altitude ≤1500 m |
2.2 Primary Distribution Gas-Insulated Ring Main Unit (RMU)
| Technical Parameter | Unit | 12 kV Class | 24 kV Class |
|---|---|---|---|
| Typical Nominal System Voltage | kV | 10/11 | 20/22 |
| Rated Frequency | Hz | 50;60 Hz | 50;60 Hz |
| Rated Current of Busbar / Ring Main Load-Break Switch | A | 630 | 630 |
| Rated Current of Transformer Vacuum Circuit-Breaker Feeder | A | 200 | 200 |
| Maximum Current of Switch-Fuse Feeder | A | 200 | 200 |
| Rated Short-Time Withstand Current | kA r.m.s. | 21 | 16 |
| Rated Duration of Short-Circuit | s | 3 | 3 |
| Rated Peak Withstand Current | kA peak | 52.5 | 40 |
| Rated Short-Duration Power-Frequency Withstand Voltage (Phase-to-Earth / Between Phases) | kV r.m.s. | 28 | 50 |
| Rated Lightning Impulse Withstand Voltage (Phase-to-Earth / Between Phases) | kV peak | 75 | 125 |
| Main-Circuit Insulation / Arc-Interruption Medium | — | SF6 gas insulation / Vacuum interruption in V unit | SF6 gas insulation / Vacuum interruption in V unit |
| Main Switching Device Configuration | — | Ring main load-break switch; transformer vacuum circuit-breaker or switch-fuse combination unit | Ring main load-break switch; transformer vacuum circuit-breaker or switch-fuse combination unit |
| Opening / Closing / Break Time | ms | Opening ≤45; closing approx. 60; break time ≤60 | Opening ≤45; closing approx. 60; break time ≤60 |
| Loss of Service Continuity Category / Partition Class | — | Panels without fuses: C2 / PM Panels with fuses: C2A / PM | Panels without fuses: C2 / PM Panels with fuses: C2A / PM |
| Power-Frequency Withstand Voltage Across the Isolating Distance | kV r.m.s. | 32 | 65 |
| Lightning Impulse Withstand Voltage Across the Isolating Distance | kV peak | 85 | 145 |
| Installation Arrangement | — | Indoor, fixed installation Outdoor use requires a dedicated enclosure and corresponding tests | Indoor, fixed installation Outdoor use requires a dedicated enclosure and corresponding tests |
| Applicable Standards | — | Assembly: IEC 62271-200 / IEC 62271-1 Circuit-breakers: -100; disconnectors / earthing switches: -102 Switches: -103; switch-fuse combinations: -105; degrees of protection: IEC 60529 | Assembly: IEC 62271-200 / IEC 62271-1 Circuit-breakers: -100; disconnectors / earthing switches: -102 Switches: -103; switch-fuse combinations: -105; degrees of protection: IEC 60529 |
| Degrees of Protection by Compartment / Cover | — | Gas compartment: IP65; low-voltage compartment: IP4X Mechanically operated circuit-breaker front panel: IP3X | Gas compartment: IP65; low-voltage compartment: IP4X Mechanically operated circuit-breaker front panel: IP3X |
| Ambient Temperature / Altitude Conditions | — | −5 to +40 °C; 24 h average ≤+35 °C; altitude ≤2000 m | −5 to +40 °C; 24 h average ≤+35 °C; altitude ≤2000 m |
III. Solid-Insulated Switchgear
| Technical Parameter | Unit | 12 kV Class Screened Solid-Insulated Switchgear | 24 kV Class Solid-Insulated Switchgear |
|---|---|---|---|
| Typical Nominal System Voltage (Project-Specific Verification Required) | kV | 10/11 | 20/22 |
| Rated Frequency | Hz | 50/60 | 50/60 |
| Rated Busbar Current | A | 630 | 630/1250 |
| Rated Circuit-Breaker Feeder Current | A | 630 | 630/1250 |
| Rated Short-Time Withstand Current | kA r.m.s. | 20 | 25 |
| Circuit-Breaker Rated Short-Circuit Breaking Current | kA r.m.s. | 20 | 25 |
| Rated Short-Duration Power-Frequency Withstand Voltage (Phase-to-Earth / Between Phases) | kV r.m.s. | 42 | 50 |
| Rated Lightning Impulse Withstand Voltage (Phase-to-Earth / Between Phases) | kV peak | 95 | 125 |
| Solid-Insulation Construction | — | Screened solid insulation; main switching device uses vacuum technology | Main-circuit live parts encapsulated in epoxy resin with an external conductive layer |
| Use of Sulphur Hexafluoride | — | No / SF6-free | No / SF6-free |
| Main Switching Device Configuration | — | Fixed vacuum disconnecting circuit-breaker Integrated breaking, disconnecting and earthing functions | Vacuum circuit-breaker; disconnector / earthing switch configuration to be confirmed |
| Internal Arc Classification and Installation Conditions | — | Confirm against the internal arc test report for the selected switchgear type; do not infer from the short-time withstand current | Confirm against the internal arc test report for the selected switchgear type; do not infer from the short-time withstand current |
| Installation Arrangement | — | Indoor, fixed modular switchgear is selected for this table | Installation and service conditions to be confirmed by supplier documentation |
| Catalogue Ambient Temperature / Altitude Conditions | — | −15 to +40 °C; −25 °C; screened cable connections are required at altitudes ≤3000 m | −15 to +40 °C; −25 °C; screened cable connections are required at altitudes ≤3000 m |
Medium Voltage Switchgear Features & Procurement Considerations
Compare insulation systems, switching functions, protection arrangements and maintenance access when specifying medium voltage switchgear for your project.
Full Insulation Solution Selection
Flexible selection of Air (AIS), Gas (GIS/SF6), and Solid Insulation (SIS) technologies per IEC 62271 and GB 3906 standards for 6~40.5kV systems to optimize space, budget, and environmental conditions.
Switching & Protection
High short-circuit breaking current (Isc) and rated voltage (Ue) ratings matched with selective time-current curves (t-I) to ensure rapid fault isolation and upstream/downstream protection logic.
Maintenance Planning
Robust mechanical and electrical 5-safety interlocks per GB 3906 alongside IAC internal arc classification testing to effectively prevent operator errors and protect site personnel.
Project Rating Selection
Enclosure protection ratings up to IP65 designed to withstand harsh outdoor conditions, heavy pollution, high humidity, condensation, extreme cold, and high altitudes.
Modular Interchangeable Interface
Standardized primary/secondary dimensions (A/B/C) and withdrawable circuit breaker truck interfaces enable seamless modular swapping, fast installation, and easy capacity expansion.
Low Maintenance & Serviceability
Maintenance-free operating mechanisms and modular layout drastically reduce routine inspection frequency, simplify field servicing, and minimize total cost of ownership (TCO).
Life Endurance & High Reliability
Engineered to high M2/E2 mechanical and electrical endurance classes per IEC standards, providing reliable switching operations and an operating lifespan exceeding 30 years.
Compliant Delivery & Technical Support
Complete engineering technical handover package including IEC/GB type-test reports, certified drawings, and specification sheets to streamline bidding and grid connection acceptance
Medium Voltage Switchgear Applications & Industries Served
Review typical distribution applications and confirm the panel arrangement, installation environment and protection duty for your project.
Substation
Medium voltage switchgear for incoming, outgoing and bus-section circuits in utility and industrial substations. Confirm the protection scheme and installation requirements.
Solar Power Plants
Switchgear for photovoltaic collection and distribution circuits. Specify feeder functions, cable interfaces and the grid-connection protection requirements.
Thermal Power Plants
Switchgear for auxiliary supplies and industrial distribution in power-generation facilities. Match the panel configuration to the approved single-line diagram.
Power Distribution Networks
Distribution panels and ring main units for urban and rural networks. Review sectionalizing, transformer protection and future network expansion requirements.
Wind Farms
Switchgear for wind-farm collection networks and substation interfaces. Confirm site conditions, feeder ratings and remote-control requirements.
Energy Storage Power Stations
Switchgear for medium-voltage distribution and grid interfaces in energy-storage projects. Coordinate protection, interlocks and operating requirements with the system design.
Medium Voltage Switchgear Technical Review, Verification & Project Delivery
Use this project review framework to confirm the switchgear 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 incoming materials, assembly records, wiring, mechanical operation, interlocks and applicable routine tests. A project-specific FAT can include buyer witness points, acceptance criteria and signed records. Gas-system checks apply only to equipment that uses an insulating gas. 【Manual-add-here: production photos, inspection records and approved FAT scope】
Technical Review
Review the selected medium voltage switchgear against the purchaser specification, single-line diagram and applicable assembly and component standards. Confirm the insulation system, busbar current, fault ratings, protection relays, cable connections, auxiliary supplies 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 medium voltage switchgear project? Send the single-line diagram, electrical ratings, panel schedule, site conditions, quantities and destination so that the technical and commercial requirements can be reviewed.
Medium Voltage Switchgear FAQ - Technical & Purchasing Questions
Answers covering equipment selection, configuration, installation conditions, testing documents and project delivery.
Start with the single-line diagram, nominal system voltage, equipment rated voltage, busbar current and fault duty. Select AIS, GIS, RMU or solid-insulated construction according to the project requirements. Confirm final ratings against the selected panel data sheet and test evidence.
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, enclosure protection and available installation space. Outdoor switchgear requires a suitable enclosure and verified service conditions.
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.
Medium Voltage Switchgear Technical Articles & Insights
Use these technical articles to understand operating principles, compare configurations, and prepare a more complete project specification before requesting a quotation.
Medium Voltage Switchgear Selection Guide
Compare AIS, GIS, RMU and solid-insulated switchgear when preparing a project specification. Review electrical ratings, installation conditions and the required circuit functions.
Switchgear Protection & Circuit Configuration
Understand how incoming feeders, outgoing feeders, bus sections and protection relays fit into the single-line diagram and operating requirements.
Switchgear Testing & Procurement Checklist
Prepare the drawing, test-document and delivery requirements needed for a technical enquiry and project-specific quotation.