VSG-40.5 Indoor Side-Mounted Vacuum Circuit Breaker – 33kV/35kV/36kV High Voltage VCB
The VSG-40.5 series is a high-performance, side-mounted indoor vacuum circuit breaker designed for 33kV to 40.5kV power systems. Featuring a robust three-phase 50Hz design, it serves as a reliable control and protection unit for industrial enterprises, power plants, and substations. Engineered for longevity and frequent operation, this VCB ensures stable performance in demanding medium-voltage environments.
Product Overview
The VSG/C-40.5 Series Side-Mounted Vacuum Circuit Breaker is an advanced indoor three-phase 50Hz switching unit designed to meet the evolving demands of modern power distribution. With a rated voltage of 40.5kV, this VCB is specifically engineered as a control and protection unit for industrial and mining enterprises, power plants, and substations. Its robust design makes it exceptionally suitable for applications requiring frequent operation and high mechanical reliability.
Key Features
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Advanced Design: Utilizes a unique design concept combined with market demand for high-performance indoor switchgear.
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High Durability: Features a mechanical life of up to 20,000 cycles, ensuring long-term operational stability.
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Reliable Protection: Designed to provide precise control and protection for critical electrical equipment in demanding environments.
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Optimized Performance: Engineered for high-frequency switching with a lightning impulse withstand voltage peak of 185kV.
Technical Specifications
Main Technical Parameters
| Item | Unit | Data |
| Rated Voltage | kV | 40.5 |
| Rated Frequency | Hz | 50 |
| Rated Current | A | 1250 / 1600 / 2000 |
| Rated Short-Circuit Breaking Current | kA | 25 / 31.5 |
| Rated Short-Time Withstand Current (4s) | kA | 25 / 31.5 |
| Rated Peak Withstand Current | kA | 63 / 80 |
| Mechanical Life | times | 20000 |
| Lightning Impulse Withstand Voltage (Peak) | kV | 185 |
Mechanical Characteristic Parameters
| Item | Unit | Data |
| Contact Opening Distance | mm | 18±1 |
| Contact Stroke | mm | 5±1 |
| Average Closing Speed | m/s | 0.8±0.2 |
| Average Breaking Speed | m/s | 1.8±0.2 |
| Closing Time (at rated voltage) | ms | ≤100 |
| Breaking Time (at rated voltage) | ms | 20-50 |
Application Environments
The VSG/C-40.5 circuit breaker is designed to operate reliably under the following ambient conditions:
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Temperature: -10°C to +40°C (Storage and transport allowed at -30°C).
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Humidity: Daily average ≤ 95%; Monthly average ≤ 90%.
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Altitude: Not exceeding 1500m.
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Saturated Vapor Pressure: Daily average ≤ 2.2kPa; Monthly average ≤ 1.8kPa.
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Earthquake Intensity: ≤ 8 degrees.
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Installation Site: Must be free from fire, explosion risks, serious filth, chemical erosion, and violent vibration.
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