40.5kV Indoor Floor-Mounted Vacuum Circuit Breaker – VBI Mechanism Withdrawable Type VCB
The VBI series 40.5kV indoor high-voltage vacuum circuit breaker is a high-performance protection unit designed for three-phase AC 50Hz power systems. Engineered for versatility, it can be installed as a fixed unit or a withdrawable type on a trolley for easy maintenance within switchgear cabinets. With its reliable VBI spring-operated mechanism, this VCB is the ideal choice for demanding environments requiring frequent operations in industrial plants, power stations, and substations.
Product Overview
The VBI Series 40.5kV Indoor Floor-Mounted Vacuum Circuit Breaker is a high-voltage protection and control unit designed for three-phase AC 50/60Hz power systems. This versatile device can be deployed as a fixed-type unit or as a withdrawable-type circuit breaker installed on a trolley, making it perfectly suited for various switch cabinet configurations. Its reliable performance and ease of installation make it the premier choice for high-voltage transmission and distribution systems in power plants, substations, and industrial enterprises.
Key Features
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Flexible Installation: Supports both fixed and withdrawable (trolley-mounted) formats to fit different switchgear needs.
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High Reliability: Equipped with a VBI spring-operated mechanism for stable and consistent operation.
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Durable Design: Offers a mechanical life of up to 10,000 cycles.
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Broad Protection: Engineered for environments requiring frequent operation, ensuring continuous safety for electrical equipment.
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 |
| Rated Short-Circuit Breaking Current | kA | 20 / 25 / 31.5 |
| Rated Short-Time Withstand Current (4s) | kA | 20 / 25 / 31.5 |
| Rated Peak Withstand Current | kA | 50 / 63 / 80 |
| Lightning Impulse Withstand Voltage (Peak) | kV | 185 |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
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 |
Application Environments
To ensure optimal performance, the VBI 40.5kV VCB should be operated within the following ambient conditions:
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Ambient Air Temperature: -40°C to +40°C (Daily average should not exceed 35°C).
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Relative Humidity: Daily average ≤ 95%; Monthly average ≤ 90%.
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Altitude: Not exceeding 1000m.
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Installation Site: Must be free from significant fire hazards, explosion risks, heavy pollution, chemical erosion, or violent vibration.
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