The Fixed Side-Mounted Type VS1 Indoor High Voltage Vacuum Circuit Breaker (hereinafter referred to as the circuit breaker) is an indoor switchgear used in 12kV power systems. It serves as a protection and control unit for power grids and industrial and mining enterprises. It is suitable for switching various types of loads and for applications requiring frequent operations and multiple interruptions of short-circuit currents.
This product adopts a newly developed operating mechanism. The primary part of the VS1 circuit breaker can be equipped with internationally branded solid-sealed poles, which integrate the vacuum interrupter and the main conductive components into a single sealed unit. This design effectively protects the interrupter from impacts, dust, and condensation, offering excellent environmental adaptability and significantly reducing operation and maintenance costs.
It truly realizes maintenance-free performance for the primary circuit and low-maintenance requirements for the operating mechanism. The operating mechanism is integrated with the circuit breaker body and has passed type tests, achieving an E2 level of electrical endurance and an M2 level of mechanical endurance.
Specification
| No. | Item | Unit | Data |
| 1 | Rated Voltage | kV | 12 |
| 2 | Maximum Working Voltage | kV | 12 |
| 3 | Rated Current | A | 630, 1250; 630, 1250; 630, 1250, 1600, 2000, 2500, 3150, 4000 |
| 4 | Rated Short-Circuit Breaking Current | kA | 20; 35; 31.5; 40 |
| 5 | Rated Short-Circuit Making Current | kA | 50; 63; 80; 100 |
| 6 | Rated Peak Withstand Current | kA | 50; 63; 80; 100 |
| 7 | Rated Short-Time Withstand Current | kA | 20; 25; 31.5; 40 |
| 8 | Rated Insulation Level | Power Frequency Withstand Voltage (before & after breaking) | 42 (contact gap: 48); 2 (secondary circuit insulation) |
| Impulse Withstand Voltage (before & after breaking) | 75 (contact gap: 84) | ||
| 9 | Rated Operating Sequence | Open—0.3s—Close-Open—180s—Close-Open | |
| 10 | Mechanical Life | operations | 10,000 |
| 11 | Rated Short-Circuit Breaking Times | operations | 30 |
| 12 | Operating Mechanism Rated Closing Voltage (DC) | V | 110, 220 |
| 13 | Operating Mechanism Rated Opening Voltage (DC) | V | 110, 220 |
| 14 | Contact Gap | mm | 11±1 |
| 15 | Over-Travel (Contact Spring Compression Length) | mm | 3.5±0.5 |
| 16 | Three-Phase Opening/Closing Asynchronism | ms | ≤2 |
| 17 | Contact Closing Bounce Time | ms | ≤2 |
| 18 | Average Opening Speed | m/s | 0.9–1.2 |
| 19 | Average Closing Speed | m/s | 0.4–0.8 |
| 20 | Opening Time | At Maximum Operating Voltage | ≤0.05 s |
| At Minimum Operating Voltage | ≤0.08 s | ||
| 21 | Closing Time | s | 0.1 |
| 22 | Main Circuit Resistance per Phase | μΩ | <50 (630A); <45 (1250A); <35 (1600–2000A) |
| 23 | Permissible Cumulative Wear of Contacts | mm | 3 |
