VSG-40.5 Indoor High Voltage Vacuum Circuit Breaker with Embedded Poles – Dedicated for KYN61 Switchgear
The VSG-40.5 series is a high-performance indoor vacuum circuit breaker featuring advanced embedded poles technology. Designed specifically for KYN61-40.5(Z) switchgear systems, it operates at a rated voltage of 40.5kV with a three-phase AC 50Hz frequency. This robust VCB serves as an ideal control and protection unit for power plants, substations, and industrial enterprises, offering reliable performance for locations requiring frequent operations. With its flexible installation, it can be used as either a fixed type or a withdrawable type installed on a trolley.
Product Overview
The VSG-40.5 Series Indoor High Voltage Vacuum Circuit Breaker is an advanced power distribution component designed for three-phase AC 50Hz systems with a rated voltage of 40.5kV. Featuring state-of-the-art embedded pole technology, this VCB provides superior insulation and protection for electrical equipment in power plants, substations, and industrial mining enterprises. It is specifically engineered to be the premier choice for KYN61-40.5(Z) switchgear cabinets, supporting both fixed and withdrawable installation forms.
Key Features
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Embedded Pole Technology: Offers enhanced environmental resistance and high dielectric strength compared to traditional insulation.
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KYN61 Compatibility: Perfectly matched for seamless integration with KYN61 series high-voltage switchgear.
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High Reliability: Designed for frequent operations with a mechanical life of up to 10,000 cycles.
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Maintenance-Free: Utilizing vacuum as the interrupting medium ensures long-term stability without the need for frequent internal maintenance.
Technical Specifications
Main Technical Parameters
| Item | Unit | Data |
| Rated Voltage | kV | 40.5 |
| Rated Frequency | Hz | 50/60 |
| Rated Current | A | 630 / 1250 / 1600 / 2000 / 2500 |
| 1min Power Frequency Withstand Voltage | kV | 95 |
| Lightning Impulse Withstand Voltage (Peak) | kV | 185 |
| Rated Short-circuit Breaking Current | kA | 20 / 25 / 31.5 |
| Rated Operating Sequence | O-0.3s-CO-180s-CO | |
| Mechanical Life | times | 10000 |
Mechanical Characteristic Parameters
| Item | Unit | Data |
| Contact Opening Distance | mm | 20±2 |
| Contact Overtravel | mm | 6±1 |
| Average Closing Speed | m/s | 0.6±0.2 |
| Average Breaking Speed | m/s | 1.2±0.2 |
| Contact Closing Bounce Time | ms | ≤3 |
| Circuit Resistance per Phase | μΩ | ≤80 |
Ambient Application Conditions
To ensure optimal performance and safety, the following conditions must be met:
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Temperature: -40°C to +40°C (Daily average ≤ 35°C).
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Humidity: Daily average relative humidity ≤ 95%; Monthly average ≤ 90%.
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Altitude: Not exceeding 1000m.
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Environment: The installation site must be free from fire, explosion risks, heavy pollution, chemical erosion, or violent vibration.
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