Product Description
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
Circuit breakers are made in varying sizes, from small devices that protect low-current circuits or individual household appliance, up to large switchgear designed to protect high voltage circuits feeding an entire city. The generic function of a circuit breaker, or fuse, as an automatic means of removing power from a faulty system is often abbreviated as OCPD (Over Current Protection Device).
| 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 |
XK 11kv insulated high voltage 3 poles parts of vacuum circuit breaker vcb
