VSG-40.5 Indoor 33kV / 35kV / 40.5kV Vacuum Circuit Breaker (VCB)
The VSG-40.5 series is a high-performance indoor vacuum circuit breaker designed for 33kV to 40.5kV power systems. Featuring a robust side-mounted design and a mechanical life of up to 20,000 cycles, it is engineered for frequent operations in industrial plants, power stations, and substations. This VCB provides reliable control and protection for electrical equipment with a rated insulation level of 185kV lightning impulse withstand voltage.
Product Overview
As a premier 33kv vacuum circuit breaker supplier, Enertro offers the VSG-40.5 series, which is a high-performance indoor vacuum circuit breaker specifically engineered for 33kV, 35kV, and 40.5kV power systems.
Featuring a robust side-mounted design and a mechanical life of up to 20,000 cycles, this 33kV VCB is ideal for frequent operations in industrial plants, power stations, and substations. It provides reliable control and protection with a rated insulation level of 185kV lightning impulse withstand voltage, making it a top choice for global electrical projects.
Technical Specifications
Main Technical Parameters
| Item | Unit | Data |
| Rated Voltage | kV | 33KV/35KV/40.5KV |
| Rated Frequency | Hz | 50 |
| Rated Current | A | 1250 / 1600 / 2000 |
| 4S Rated Short-time Withstand Current | kA | 25 / 31.5 |
| Rated Peak Withstand Current | kA | 63 / 80 |
| Rated Short-circuit Breaking Current | kA | 25 / 31.5 |
| Rated Operating Sequence | O-0.3s-CO-180s-CO | |
| Mechanical Life | times | 20000 |
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
To maintain optimal safety and performance, the VSG/C-40.5 must be installed under the following ambient conditions:
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Ambient Temperature: -10°C to +40°C (Storage and transport allowed at -30°C).
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Relative Humidity: Daily average ≤ 95%; Monthly average ≤ 90%.
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Altitude: Not exceeding 1500m.
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Seismic Resistance: Earthquake intensity ≤ 8 degrees.
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Installation Requirements: Site must be free from fire hazards, explosion risks, heavy pollution, chemical erosion, or violent vibration.
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