| Brand | ROCKWILL |
| Series | VD4 |
| Rated voltage | 12kV |
| Rated normal current | 630-3150A |
| Rated short-duration withstand voltage | 42kA |
| Lightning impulse withstand voltage | 75kV |
The product offers multiple significant advantages, which can fully meet the diverse needs of industrial and power systems. Specifically included are：
The main circuit of the VSV series vacuum circuit breaker adopts a fully enclosed structure, available in two types: insulated cylinder or solid pole.
The main electrical components are longitudinally installed in an epoxy resin cylinder cast via the APG process. This structure offers superior arc resistance, anti-aging properties, and high mechanical strength. It effectively shields the vacuum interrupter from external factors such as mechanical impacts and environmental pollution while enhancing the conductive circuit’s capability to withstand rated short-term (peak) withstand currents.
The miniaturized vacuum interrupter and other main circuit components are directly sealed in epoxy resin using advanced APG technology. This not only simplifies the pole assembly process and improves the reliability of the vacuum interrupter’s conductive circuit but also protects the interrupter’s outdoor surface from external mechanical forces and environmental influences.
During capacitive current interruption, the breaker exhibits an extremely low probability of re-strike, fully meeting the requirements for C2-level circuit breakers.
The breaker has passed all type tests at Shenyang High Voltage Apparatus Research Institute and High Voltage Apparatus Research Institute. It meets IEC E2 maintenance-free class requirements as follows:
| Item | Unit | Rated Value |
|---|---|---|
| Rated highest voltage for equipment | kV | 12 |
| Rated frequency | Hz | 50 |
| Rated normal current (40℃ ambient temperature) | A | 630 / 1250 / 1600 / 2000 / 2500 / 3150 |
| Rated short-duration power-frequency withstand voltage (1 min, r.m.s.) | kV | 42 |
| Rated lightning impulse withstand voltage (peak, 1.2/50μs) | kV | 75 |
| Rated short-circuit breaking current (symmetrical r.m.s.) | kA | 25 / 31.5 / 40 |
| Rated short-circuit making current (peak value) | kA | 63 / 80 / 100 |
| Rated short-time withstand current (4s duration, r.m.s.) | kA | 25 / 31.5 / 40 |
| Rated out-of-step breaking current | kA | 6.25 / 7.875 / 10 |
| Rated phase-to-phase short-circuit breaking current | kA | 21.8 / 27.4 / 34.8 |
| Rated cable charging breaking current | A | 25 |
| Rated single / back-to-back capacitor bank breaking current | A | 800 |
| Rated number of short-circuit breaking operations | times | 30 |
| Rated operating sequence (IEC general distribution) | - | O – 0.3 s – CO – 3min – CO |
| Rated mechanical endurance | times | 20000 |
| Maximum applicable altitude | m | ≤4000 |
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