Product Description
Operating Mechanism of Vacuum Circuit Breaker:
The lower end of the breaker is fixed to a spring-operated or solenoid operated mechanism so that the metallic bellows inside the chamber are moved upward and downward during closing and opening operations respectively. The contact movement should be such as to avoid bounce. It is noteworthy that the operating mechanism should provide sufficient pressure for a good connection between the contacts.
The pressure in a vacuum interrupter at the time of sealing off is kept about 10–6 torr. The interrupting rating is between 250 and 1,000 MVA. The normal current carrying capacity for a single interrupter is 800 – 3,000 A; 4.2 kV – 7.6 kV.
| Item | Unit | Data |
| Rated voltage | KV | 12 |
| Maximum working voltage | KV | 12 |
| Rated Current | A | 630-1250 | 630-1600 | 630-1600 |
| Rated short circuit breaking current | KA | 20 | 25 | 31.5 |
| Rated short-circuit switching current | KA | 50 | 63 | 80 |
| Rated peak withstand current | KA | 50 | 63 | 80 |
| 4S rated short-circuit withstand current | KA | 20 | 25 | 31.5 |
| Rated insulation level | 1min Power frequency withstand voltage | KV | 42(fracture 48) |
| lmpulse withstand voltage | KV | 75(fracture 84) |
| Rated short-circuit current breaking times | Times | 50 |
| Rated Operating Mechanism Closing Voltage(DC) | V | AC,DC 110,220 |
| Rated Operating Mechanism Opening Voltage(DC) | V | AC,DC 110,220 |
| Contact opening distance | mm | 11±1 |
| Overtravel(the length of contact spring compression) | mm | 3.5±0.5 |
| Closing/Opening Time Difference Among Three Phase | ms | ≤2 |
| Contact closing bounce time | ms | ≤2 |
| Average opening speed | m/s | 0.9-1.2 |
| Average closing speed | m/s | 0.5-0.8 |
| Tripping Time | Maximum operating voltage | S | ≤0.05 |
| Minimum operating voltage | S | ≤0.08 |
| Closing time | S | 0.1 |
| The main circuit resistance of each phase | | 630≤50 | 1250≤45 | 1600≤40 |
| Allowed Consumpted thickness of Contacts | mm | 3 |
