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Indoor Vacuum Circuit Breakers
Home / Products / Vacuum Circuit Breakers / Indoor Vacuum Circuit Breakers / VS1 12kV Medium-Voltage Indoor Drawout Vacuum Circuit Breaker, 31.5kA
Under normal operation, the breaker’s main contacts remain closed, allowing uninterrupted current flow. During overload or short-circuit events, the thermal or magnetic trip mechanism activates. The spring mechanism ensures rapid contact separation, generating a controlled electric arc. This arc is immediately directed into the vacuum interrupter, where it is cooled, divided, and extinguished. This process isolates the faulty section, protects downstream equipment, and prevents damage to the overall system. The result is fast fault clearance, safe operation, and minimal maintenance requirements.
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The vacuum circuit breaker adopts an integrated layout with epoxy resin insulated poles and a spring-operated mechanism, allowing for a simple, reliable, and highly visible operating structure. Each functional unit is clearly laid out, making inspection, maintenance, and operation straightforward. The breaker’s mechanical and electrical components are engineered for high durability, providing up to 30,000 mechanical operations and superior performance in frequent switching applications. Its fully insulated construction ensures safe operation in indoor environments, with IP4X protection against dust and other contaminants.
With over 40 years of experience in vacuum breaker technology, MINGTUO combines proven manufacturing quality with continuous R&D improvements. The design ensures maintenance-free operation under frequent switching, extreme temperatures, and high fault currents. Predictive monitoring capabilities further enhance reliability, allowing operators to schedule maintenance before issues arise, reducing downtime and operational costs.
MINGTUO Vacuum Circuit Breakers are designed to exceed standard expectations:
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Rapid fault interruption with high short-circuit breaking capacity up to 40kA |
Minimal contact wear and extended electrical lifespan due to advanced vacuum technology |
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| Fully insulated construction with visible isolation gaps for safety |
Integrated mechanical interlocks to prevent misoperation |
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| Digital monitoring and remote operation options for modern smart grids | Compliant with IEC 62271-100 and ANSI C37.04 standards |
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| Routine type and performance tests, including withstand voltage, mechanical operating time, and contact resistance measurements |
5-year warranty for long-term reliability |
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| No | Item | Units | Count value |
| 1 | The rated voltage | - | 12 24 35 |
| 2 | The rated voltage (short-term frequency tolerance 1min) | kV | 42 |
| 3 | The rated voltage tolerance lightning shocks peak | - | 75 |
| 4 | Rated frequency | Hz | 50 |
| 5 | Rated current | A | 630、1250 |
| 630、1250、1600、2000、2500、3150 | |||
| 1250、1600、2000、2500、3150、4000 | |||
| 6 | Rated short open circuit current | kA | 20/25、31.5、40 |
| 7 | The rated voltage short tolerance | kA | 20/25、31.5、40 |
| 8 | Rated short duration | s | 4 |
| 9 | Rated current peak tolerance | kA | 50/63、80、100 |
| 10 | Rated short-circuit current close | kA | 50/63、80、100 |
| 11 | The secondary circuit frequency voltage tolerance 1min) | V | 2000 |
| 12 | Rated singleback capacitor set open circuit current | A | 630/400 (40kA 800/400) |
| 13 | Rated capacitor set close currents | kA | 12.5 (frequency no greater than 1000Hz) |
| 14 | Break-brake time (rated voltage) | ms | ≤50 |
| 15 | Feeder time (rated voltage) | ms | ≤100 |
| 16 | Mechanical life | - | 20000 |
| 17 | Rated current open circuit times (life) | Switching | 20000 |
| 18 | Rated short-circuit current open circuit | - | 50(40kA≤30) |
| 19 | Dynamic and static contact allow wear thickness | mm | 3 |
| 20 | The rated operating voltage feeder | - | - |
| 21 | The rated voltage break-brake operations | V | AC110/220 DC110/220 |
| 22 | Storage motor rated voltage | - | - |
| 23 | Storage motor power rating | W | 70 |
| 24 | Storage time | s | ≤10 |
| 25 | Contact opening distance | mm | 11 ± 1 |
| 26 | Super-trip | - | 3.5 ± 0.5 |
| 27 | Closing contact bounce time | ms | ≤240(A≤3) |
| 28 | Three-phase points, closing at different stages of sexual | - | ≤2 |
| 29 | Average gate speed (contact separation-6mm) | m/s | 0.9–1.2 |
| 30 | Average closing speed (6mm-contact closure) | m/s | 0.5–0.8 |
| 31 | Leading electric circuit resistance | μΩ |
≤50(630a)、≤45(1250A) ≤35(1600–2000A)、≤250(2400) |
| 32 | Contactor feeder contact pressure | N |
2000±200(2000A)、2400±200(25kA) 3100±200(31.5kA)、4250±250(40kA) |
| 33 | The rated operating sequence | - |
Points - 0.3s - and points 180s - and - |
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