Indoor 24KV Vacuum Circuit Breaker ZN63 VS1 VD4 Switchgear
VCB-12 series solid-sealed indoor vacuum circuit breaker is an indoor high-voltage switchgear for three-phase power system with rated voltage of 12 kV and frequency of 50 Hz. It is used as protection and control appliance due to vacuum circuit breaker. The special advantages are especially suitable for frequent operations requiring rated current or multiple short-circuit currents.
VCB-12 series solid-sealed indoor vacuum circuit breakers are fixedly mounted, mainly used for fixed switchgear. The circuit breaker can be used alone or in ring power supply, box transformer or various non- power supply system.
| NO | Item | Units | Technical parameters | ||
| 1 | Rated voltage | KV | 12 | ||
| 2 | Rated short-duration power frequency withstand voltage | 42/48(Interphase, ground/fracture) | |||
| 3 | Rated lightning impulse withstand voltage | 42/48(Interphase, ground/fracture) | |||
| 4 | Rated frequency | Hz | 50 | ||
| 5 | Rated current | A | 630 1250 | 630 1250 1600 2000 2500 3150 | 630 1250 1600 2000 2500 3150 |
| 6 | Rated short-circuit breaking current | KA | 20/25 | 31.5 | 40 |
| 7 | Rated short-time withstand voltage | 20/25 | 31.5 | 40 | |
| 8 | Rated short circuit duration | S | 4 | ||
| 9 | Rated peak withstand current | KA | 50/63 | 80 | 100 |
| 10 | Rated short circuit closing current | 50/63 | 80 | 100 | |
| 11 | Secondary circuit power frequency withstand voltage (1min) | 2000 | |||
| 12 | Rated single / back to back capacitor group breaking current | A | 630/400(40kA:800/400) | ||
| 13 | Rated capacitor bank closing current | 12.5 (frequency is not greater than) | |||
| 14 | Mechanical life | KA | 20000 | ||
| 15 | Rated current breaking times (electrical life) | 20000 | |||
| 16 | Rated short circuit current breaking times | times | 50(40KA≤30) | ||
| 17 | Dynamic and static contacts allow wear cumulative thickness | mm | 3 | ||
| 18 | Energy storage time | s | ≤10 | ||
| 19 | Contact opening distance | mm | 11±1 | ||
| 20 | Overtravel | 3.5±0.5 | |||
| 21 | Contact closing bounce time | ms | ≤2(40KA≤3) | ||
| 22 | Three-phase split/closed period | ≤2 | |||
| 23 | Average opening speed (contacts are separated by -8mm) | m/s | 1.2±0.2 | ||
| 24 | Main conductive loop resistance | 0.6±0.2 | |||
| 25 | Main conductive loop resistance | μΩ | ≤50(630A)≤45(1250A) ≤40 (1600,2000A)≤35 (2500A or more) | ||
| 26 | Rated operation sequence | 0-0.3s-Co-180s-Co | |||
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