Products
Professional Medium Voltage Switchgear Manufacturer
Cotenele is a large manufacturer and exporter of Medium Voltage Switchgear in China, and is also an important partner of China State Grid Corporation. Our Medium Voltage Switchgear includes metal-clad switchgear, gas-insulated switchgear, and eco-friendly switchgear. These switchgears manufactured by us comply with international standards such as IEC 62271-1, IEC 62271-200, IEC 62271-100, as well as national standards such as GB/T 3906, GB/T 1984, and GB/T 11022. They have been exported to multiple countries and regions in Europe, Africa, and the Middle East, and have received widespread praise from customers in these markets.
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33KV Medium Voltage Gas Insulated System
As a lager electric equipment manufacturer,Cotenele has long been committed to the research and development of new products for many years.The 33KV Medium Voltage Gas Insulated System is our newly developed product with a highest voltage level of 40.5kv.This medium-voltage ring main unit is a gas-insulated metal enclosed switchgear (C-GIS),Its core feature is to completely seal high-voltage live parts such as vacuum circuit breakers, isolating switches, and busbars in a stainless steel gas box filled with insulating gas.
33KV Medium Voltage Metalclad Switchgear Panels
As a major exporter of medium-voltage switchgear in China, Cotenele’s products are widely distributed across global markets.The KYN61-40.5 (Z) series 33KV Medium Voltage Metalclad Switchgear Panels manufactured by Cotenele are designed for three-phase AC 50 Hz power systems. They are used for receiving and distributing electrical energy in power plants, substations, and distribution rooms of industrial and mining enterprises, while also providing control, protection, and monitoring of electrical circuits.
33KV MV Switchgear Medium Voltage Switch Gear
KYN28-40.5 medium-voltage switchgear is a new product developed by Cotenele, with a rated voltage of up to 40.5kv,This KYN28-40.5 type of 33KV MV Switchgear Medium Voltage Switch Gear, is primarily intended for three-phase AC power systems with a rated voltage of 40.5 kV and a frequency of 50 Hz. It is commonly applied in single-busbar and sectionalized busbar arrangements. The product design complies with relevant standards such as IEC 298 and GB3906-2006.
22KV Medium Voltage Metal Clad Switchgear
Cotenele has been committed to technological research and development in the field of medium voltage switchgear and ring main unit products for many years, covering a full range of switchgear panels with rated voltages from 3.6kV to 40.5kV.The KYN28-24 series 22KV Medium Voltage Metal Clad Switchgear we manufactured has advanced technology, is safe and reliable, has a reasonable structure, stable performance, and is easy to use. It is widely used in power plants, substations, industrial and mining enterprises, and commercial buildings.
11KV Indoor Metal Clad Medium Voltage Switchgear
Cotenele is a manufacturing electrical panels factory which is located in Wenzhou city of China,we provide kyn28-12 series 11KV Indoor Metal Clad Medium Voltage Switchgear and the internal core components such as vacuum circuit breaker,load break switch,current transformer and voltage transformer ect within them,our eletrical products have exported lots of countries and regions oversea,and they are widely praised by our clients.
What Are The Types Of Medium Voltage Switchgear?
Medium voltage switchgear is an essential electrical device for control, protection, and isolation of electrical equipment with rated voltage from 3.6 kV to 40.5 kV in power distribution networks.
There are several types based on application, cost, and environmental conditions, including withdrawable (middle mounted) switchgear, fixed switchgear, ring main units (RMUs), gas insulated switchgear, and solid insulated switchgear.
1. Withdrawable Switchgear
The vacuum circuit breaker of this switchgear is usually installed on a movable handcart, which can be easily moved in and out of the cabinet.
The main advantage is fast maintenance and replacement: a faulty breaker can be swapped with a spare unit within minutes, greatly reducing downtime.
Withdrawable types, such as KYN28 12, also offer flexible configuration and reliable mechanical interlocks. They are widely used in substations, industrial plants, and utility distribution systems where high reliability and easy maintenance are required.
2. Fixed Switchgear
Fixed switchgear keeps all primary components permanently installed inside the panel.
This structure results in lower material and manufacturing cost often 30 to 50 percent less than withdrawable types.
The trade off is longer repair time, since any fault requires de energizing the whole section.
Fixed types (such as XGN2 12) are still widely used in budget limited projects, secondary circuits, or locations where switching operations are infrequent.
3. Ring Main Units (RMUs)
An RMU is a compact, factory assembled switchgear mainly used in secondary distribution networks.
Instead of circuit breakers, most RMUs use load break switches combined with fuses for transformer protection.
They are suitable for ring main networks, compact substations, and outdoor cabinet installations due to their small size and lower cost.
The main limitation is that they cannot interrupt high short circuit currents independently and rely on fuses or upstream breakers for fault protection.
4. Gas Insulated Switchgear (GIS)
Gas insulated switchgear encloses all live parts in a sealed tank filled with insulating gas, typically SF6 or newer eco friendly dry air or fluoronitrile mixtures.
Because gas has much higher dielectric strength than air, GIS equipment can be 50 to 70 percent smaller than air insulated switchgear.
It is fully sealed against moisture, dust, and salt, making it suitable for harsh environments such as coastal areas, underground substations, or offshore platforms.
The disadvantages are higher initial cost and, in SF6 based systems, environmental concerns.
5. Solid Insulated Switchgear
In solid insulated designs, high voltage conductors are embedded in epoxy resin or similar solid materials.
This provides a fully sealed and touch safe structure, eliminating dependence on air gaps or gas pressure.
Solid insulated switchgear is immune to altitude, humidity, and pollution, and is SF6 free, which makes it environmentally friendly.
Although its cost is higher than conventional air insulated switchgear, it offers a good balance of safety, compactness, and sustainability, and is widely used in green buildings and smart grid projects.
Main Differences
- Structure:withdrawable vs fixed vs compact RMU vs sealed tank vs cast solid
- Insulation medium:air, gas, or solid epoxy
- Main components:circuit breakers vs load break switches
- Application priority:maintenance convenience, cost efficiency, space saving, environmental adaptability
By understanding these classifications, engineers can select the most suitable medium voltage switchgear based on budget, reliability, space conditions, and operating environment.
| Switchgear Type | Key Advantages | Main Differences |
| Withdrawable(Middle-Mounted) | -Fast breaker replacement (minutes) -High flexibility and reliable interlocks -Widely used with good availability | -Circuit breaker on a movable carriage -Requires more space for maintenance -Higher cost than fixed type |
| Fixed | -Simple construction -Low cost(30-50%cheaper than withdrawable) -Adequate for infrequent operations | -All components permanently installed -Longer repair downtime -Larger footprint due to separate disconnectors |
| Ring Main Unit(RMU) | -Compact footprint -Low initial cost -Wellsuited for ring networks and transformer protection(with fuses) | -Uses load-break switches,not circuit breakers -Limited short-circuit breaking capacity(relies on fuses or upstream protection) |
| Gas-Insulated(GIS) | -Very smallsize(up to 70%less than air-insulated) -Sealed against moisture,dust,salt -Low maintenance,high reliability | -Live parts in a pressurized gas tank(SF₆or eco-friendly gas) -Higher cost and,for SF₆ environmental concerns |
| Solid-Insulated | -SF₆-free,environmentally friendly -Immune to altitude,humidity, pollution -Touch-safe surface,very compact | -Conductors cast in epoxy resin -Still relatively expensive -Newer technology with fewer manufacturers |
What Are The Internal Structure and Core Components In Medium Voltage Switchgears?
Four Functional Compartments
- Busbar Compartment:Located at the rear upper part of the panel, it collects and distributes power from the main busbar.
- Circuit Breaker / Handcart Compartment:Houses the circuit breaker truck, the key area for normal operation and fault interruption.
- Cable Compartment:Connects incoming and outgoing cables and accommodates current transformers and earthing switches.
- Low Voltage / Instrument Compartment:Installs secondary control, protection, and monitoring devices.
Core Functional Components
- Main Busbar: Collects and distributes electrical energy
- Circuit Breaker / Contactor: Interrupts current under normal or fault conditions
- Disconnector / Load Break Switch: Provides isolation or switching under load
- Current Transformer / Voltage Transformer: Converts high current and voltage for measurement
- Earthing Switch: Ensures safe grounding during maintenance
- Surge Arrester: Protects against lightning and switching overvoltage
- Protection Relay: Detects faults and sends trip signals
Five Protection Safety Interlocking
- Prevent incorrect operation of circuit breaker
- Prevent moving breaker under load
- Prevent closing earthing switch when circuit is live
- Prevent energizing circuit when earthing switch is closed
- Prevent access to live compartments
Main Application Scenarios
- Power Systems:Core of urban and industrial distribution networks
- Industrial Sector:Stable power for steel, petrochemical, mining industries
- Commercial and Infrastructure:Buildings, hospitals, airports, data centers
- Renewable Energy:Solar and wind integration into grid systems
- Special Environments:Offshore platforms, high altitude and high humidity areas
How To Choose Suitable Medium Voltage Switchgear?
1. Application and Network Role
Primary distribution requires high fault capacity and frequent operation. Secondary distribution focuses on compact size and lower cost.
2. Maintenance and Downtime
Withdrawable types support fast maintenance. Fixed types require longer downtime during repair.
3. Environmental Conditions
Air insulated for clean indoor areas. GIS or solid insulated for harsh environments.
4. Space Availability
Air insulated requires more space. GIS or solid insulated reduces space by 50 to 70 percent.
5. Fault Level
High fault levels require circuit breaker based systems. Moderate levels can use RMU solutions.
6. Budget and Lifecycle Cost
Fixed and RMU types reduce initial cost. Withdrawable, GIS, and solid insulated provide long term value.
7. Environmental and Safety Requirements
SF6 free systems use solid or eco friendly gas insulation. Fully enclosed designs improve public safety.
| Primary Purpose | Recommended switchgear type |
| Fast breaker replacement and high reliability | Withdrawable(middle-mounted) |
| Lowest cost and simple operation | Fixed |
| Compact secondary distribution /ring network | Ring Main Unit(RMU) |
| Harsh environment +tiny footprint | Gas-insulated(GIS) |
| SF₆-free +immunity to allclimates | Solid-insulated |
