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11KV Medium Voltage Switchgear Vacuum Circuit Breaker Isolation Switch
Cotenele is a professional China manufacturer of 11KV Medium Voltage Switchgear Vacuum Circuit Breaker Isolation Switch, specializing in 12kV–40.5kV switchgear core components. Our products are widely used in substations, renewable energy, industrial power distribution, and railway systems. These two core components of the medium-voltage ring main unit is key to building a resilient electrical infrastructure for industrial plants and modern smart grids.
In modern medium-voltage power distribution systems, Vacuum Circuit Breakers and Isolation Switches are two essential components that ensure operational safety and system reliability.
At Cotenele, we have supplied these core components to multiple 110kV substations, wind power plants, and photovoltaic projects, where stable switching performance and fault protection are critical.
While both devices are installed within medium-voltage switchgear and Ring Main Units (RMUs), they serve fundamentally different but complementary roles:
Vacuum Circuit Breaker: Responsible for fault protection
Isolation Switch: Responsible for safe isolation and maintenance
The 11KV Medium Voltage Switchgear Vacuum Circuit Breaker Isolation Switch forms the cornerstone of a safe, controllable, and easy-to-maintain power distribution system.
Product Model
| KD | V | 12 | D | 1250 | 25 |
|
Company code |
Vacuum circuit breaker Operating mechanism |
Rated voltage |
Earthing Type |
Rated current |
Rated Short-time withstand current |
What is a Vacuum Circuit Breaker?
The Vacuum circuit breaker is an electrical switchgear that uses vacuum as an arc extinguishing medium to cut off current.
Working Principle: When a fault occurs, the fixed and movable contacts inside a sealed vacuum interrupter separate. This action will generate an arc composed of ionized metal vapor. However, in an almost completely vacuum environment, no gas can sustain the combustion of an arc. Metal vapor will quickly re condense on the contact surface, almost instantly extinguishing the arc. This process can quickly isolate faults and minimize energy loss to the greatest extent possible.
Key Components: Its core is the Vacuum Interrupter, which houses the contacts. An Arc Shield protects the chamber from metal vapor contamination. An Actuator Mechanism (spring, magnetic, or motor) drives the moving contact via Operating Rods, while an Insulating Housing provides support and dielectric strength.
What is a Switch Disconnector?
A Switch Disconnector is a eletrical component of the medium-voltage switchgear or ring main unit in the modern power system, The main function of this switching device is that, in the closed position, carries the normal load current. In the open position, it provides a reliable isolating distance to ensure safety for personnel working on a circuit.
Functionality: It is designed to make and break normal load currents safely but is not primarily intended to interrupt high fault currents (short circuits). The isolation switch can withstand short-circuit current for a certain limited duration until the upstream protection component clears the fault in the abnormal situations.
Types:
Air-Insulated: This type of isolation switch is suitable for switching transformers, cables, and motors in power distribution networks.
Gas-Insulated: This type of isolating switch is usually using SF6 or SF6-free technology, they have the features o a compact footprint and high performance, ideal for metal-enclosed switchgear and applications where space is limited.
Application Scenarios
With experience in projects such as:
110kV substations
Offshore wind power projects
1600MW photovoltaic bases
Railway infrastructure (Sichuan-Tibet Railway)
The 11KV Medium Voltage Switchgear Vacuum Circuit Breaker Isolation switch is widely applied in:
1. Power Substations
Protection of transformers and feeders
Ensuring grid stability
2. Renewable Energy
Handling frequent switching
Managing power fluctuations
3. Industrial Power Systems
Steel plants, mining, petrochemical
High-load equipment protection
4. Railway and Infrastructure
Stable traction power supply
High reliability requirements
5. Commercial and Municipal Systems
Hospitals, data centers, metro systems
Technical Parameters
| SN | Content | Unit |
Technical Porameter |
| 1 | Main Circuit Resistance | uΩ | ≤60 |
| 2 | Over Travel | mm | 2-3 |
| 3 | Clearance Between Open Contacts | mm | 8-10 |
| 4 | Contact Bounce Duration at Closing Operation | ms | ≤2 |
| 5 | Average Opening Speed | m/s | 1-1.6 |
| 6 | Average Closing Speed | m/s | 0.6-1.2 |
| 7 | Out of Simultaneity of Contact Opening | ms | ≤2 |
| 8 | Out of Simultaneity of Contact Closing | ms | ≤2 |
Appearance and Dimension
Why Choose Cotenele?
1. Real Manufacturing Capability
30, 000㎡ production base in Yueqing
Focus on 12kV–40.5kV switchgear components
2. Proven Engineering Experience
Supplied to wind, solar, railway, and overseas mining projects
Verified performance in harsh environments
3. Certified Quality System
ISO9001 / ISO14001 / ISO45001
Type test reports from national laboratories
4. Continuous R&D
3 generations of RHSV environmental switchgear technology
Multiple patented designs
5. Green and Future-Oriented
SF6-free solutions
"Green Factory" and "Green Supply Chain" certifications
FAQ
1. What is the function of a Vacuum Circuit Breaker in 11kV switchgear?
The Vacuum Circuit Breaker (VCB) is responsible for protecting the electrical system by automatically interrupting fault currents such as short circuits and overloads.
It ensures fast fault clearance and prevents damage to equipment in 11kV distribution networks.
2. What is the main difference between a VCB and a Disconnector?
A vacuum circuit breaker is a protective device used to automatically cut off severe fault currents (such as short-circuit currents). A Switch Disconnector is a switching device designed to safely make and break normal load currents and provide a visible isolation point for safety; it cannot reliably interrupt fault currents.
3. Why are Vacuum Circuit Breakers Designed For environmentally friendly?
Unlike technologies of sulfur hexafluoride gas insulated circuit breakers, vacuum circuit breakers do not use greenhouse gases to extinguish arcs. They operate on a simple vacuum principle, are environmentally friendly, and comply with regulatory requirements advocating for more environmentally friendly energy solutions worldwide.
4. Do Switch Disconnectors require maintenance?
Yes, but the level depends on the type. Air-insulated switch disconnectors may require periodic inspection and contact cleaning. Gas insulated materials (such as sulfur hexafluoride) are typically "permanently sealed" and do not require frequent maintenance. Kotner offers these two types of products to meet different usage needs.
5. Can a 11KV Medium Voltage Switchgear Vacuum Circuit Breaker Isolation switch be used for protection?
Standard switch circuit breakers are unable to cut off fault currents. But if used in combination with fuses (such as in switch fuse combination devices), The Isolating switches can provide protection function. The fuse will cut off the fault current, and then the disconnectors will isolate the circuit.
6. How do VCBs support the growth of renewable energy?
If the solar and wind power systems experience significant fluctuations in power output and require frequent switching, the VCBs are suitable for these applications because they can handle frequent switching operations without performance degradation and provide fast fault-clearing capabilities, so this can ensure grid stability.
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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