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33KV Vacuum Circuit Breaker with Isolating Switch
As a professional China manufacturer, Cotenele International Trade (Wenzhou) Co., Ltd. provides specialized solutions for medium-to-high-voltage switchgear. The featured product—the KDV-40.5/630-20 Series 33kV Vacuum Circuit Breaker with Isolating Switch—is widely utilized in eco-friendly medium-voltage switchgear, Ring Main Units, and power distribution systems. This integrated assembly combines a vacuum circuit breaker with an isolating switch, offering numerous advantages such as ease of installation and a long service life.
The eco-friendly switchgear known as "green" or "SF₆-free" switchgear, Meeting this need for resilient and sustainable electrical infrastructure by combining operational excellence with environmental responsibility. The KDV-40.5/630-20 series 33kV Vacuum Circuit Breaker With Isolating Switch integrates a vacuum circuit breaker and disconnector, offering:
1.Easy installation and minimal maintenance
2.Long service life and high reliability
3.Compact and cost-effective design
4.Eco-friendly SF₆-free solution
This product meets Chinese national standards for high-voltage equipment and provides robust short-circuit and mechanical endurance performance.
Key Advantages
VCB short-time withstand: 20kA/4s or 25kA/3s
VCB mechanical endurance: 10, 000 operations
Disconnector and earthing switch mechanical endurance: 3, 000 operations
Earthing switch short-time withstand: 20kA/4s.
Product Model
| KD | V | 40.5 | 630 | 20 |
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Company code |
Vacuum circuit breaker with mechanism |
Rated voltage |
Rated current |
Rated Short-time withstand current |
What is a Vacuum Circuit Breaker?
A Vacuum Circuit Breaker is a key component of medium-voltage switchgear, designed to safely interrupt electrical current by extinguishing the arc in a high-vacuum environment.
How it works: When a fault occurs, such as a short circuit, the contacts inside the sealed vacuum interrupter separate. The vacuum environment lacks gas molecules to sustain the arc, causing it to extinguish almost instantly.
Advantages:
High reliability and long service life
Minimal maintenance requirements
Excellent breaking capacity for fault currents
Eco-friendly: Unlike traditional SF₆ circuit breakers, VCBs do not use sulfur hexafluoride, a potent greenhouse gas, making them a sustainable choice for modern switchgear.
Application: VCBs are widely used in air-insulated and gas-insulated switchgear for medium-voltage power distribution, including industrial plants, substations, metro systems, and renewable energy projects.
What is a Switch Disconnector?
A Switch Disconnector is a core component used to provide safe, visible isolation of a circuit in medium-voltage switchgear.
Primary functions:
Carry and make/break rated load currents under normal conditions
Carry short-circuit currents for a specified duration under fault conditions
Integration with VCB: When combined with a vacuum circuit breaker, the disconnector physically isolates a section of the circuit after the VCB interrupts the current, ensuring a secure isolation gap for maintenance work.
Versatility: Available for air-insulated and gas-insulated switchgear, the switch disconnector is essential for safe operation, segmentation, and flexibility of the power grid.
Benefits: Enhances operational safety, allows maintenance without de-energizing the entire system, and supports eco-friendly switchgear design.
Applications
33KV Vacuum Circuit Breaker With Isolating Switch is widely used across industries:
| Application | Description |
| Power Generation & Substations | Protects generators, transformers, and distribution lines |
| Industrial Facilities | Safeguards motors and production lines |
| Commercial Infrastructure | Protects switchgear in hospitals, data centers, office complexes |
| Renewable Energy | Switchgear protection in wind and solar farms |
| Railway Electrification | Ensures safe traction power supply |
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 | 11-12 |
| 4 | Contact Bounce Duration at Closing Operation | ms | ≤2 |
| 5 | Average Opening Speed | m/s | 1-1.6 |
| 6 | Average Closing Speed | m/s | 0.6-1.1 |
| 7 | Out of Simultaneity of Contact Opening | ms | ≤2 |
| 8 | Out of Simultaneity of Contact Closing | ms | ≤2 |
Appearance and Dimension
FAQ
Q1: Why are the vacuum circuit breaker more environmentally friendly than the traditional common breakers?
The main advantage for environment-friend of vacuum circuit breakers is their arc-quenching medium. The vacuum circuit breaker operate using a high vacuum, eliminating any risk of SF₆ emissions, but the common breakers use SF₆ gas, a substance with an extremely high global warming potential.
Q2: In an integrated unit, which device operates first during a shutdown?
A: The Vacuum Circuit Breaker always operates first to safely interrupt the current, whether under load or fault conditions. Only after the VCB has opened the circuit should the Switch Disconnector be operated to provide visible physical isolation.
Q3: Can a Switch Disconnector interrupt a fault current?
A: No. A Switch Disconnector is not designed to interrupt fault currents. Its role is to provide isolation on a de-energized circuit. Fault interruption must always be performed by the dedicated circuit breaker.
Q4: What are the main advantages of using a VCB in frequent switching applications?
A: The vacuum circuit breakers have excellent electrical and mechanical operation life. Their vacuum arc interruption causes minimal contact erosion, allowing them to handle frequent switching operations—common in industrial or capacitor switching duties—with high reliability and minimal maintenance.
Q5: What is the difference for the air-insulated and the gas-insulated disconnectors?
A:The Air-insulated disconnectors use air as the insulating medium and are common for various medium voltage indoor eco-friendly switchgears and ring main units. Gas-insulated disconnectors usually use a gas like SF₆ as the insulation medium, mounted in a sealed chamber, their size is very compact .
Q6: How does the vacuum interrupter in a VCB work?
A: When contacts separate, an arc is formed from ionized metal vapor. In the vacuum, this vapor quickly condenses back onto the contact surfaces because there are no gas molecules to sustain the arc. This leads to extremely fast arc extinction, usually within the first current zero crossing.
Q7: Are these combined solutions suitable for smart grid applications?
A: Absolutely. Modern VCBs and motor-operated disconnectors can be equipped with sensors and intelligent electronic devices.
These electronic devices can remote operation, condition monitoring, and seamless integration into automated smart grid systems, these function can enhance power grid stability and management.
Q8: When selecting a 33kV Vacuum Circuit Breaker with Isolating Switch for a project, what key specifications should I check?
A: Critical parameters include the system voltage and current ratings, the VCB's short-circuit interrupting capacity, the mechanical endurance (number of operations) of both devices, the type of operating mechanism (spring, motor), and the required insulation medium (air or gas) for the disconnector to meet environmental and space goals..
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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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