Overview: In VS1-12 type indoor high voltage vacuum circuit breaker (hereinafter referred to as breaker) is used for indoor switchgear 12 kV power system, as network equipment, industrial and mining dynamic design of protection and control unit. Because of the special advantages of vacuum circuit breakers, especially for applications that require frequent operation of the rated current, or multiple short-circuit breaking current location. Circuit breaker operating mechanism and circuit breaker before the body-in-one design, either as a fixed installation unit can also be equipped with a special promotion mechanism, consisting handcart unit uses, which can increase the corresponding fixed breaker interlock to meet need to set up the main part of the circuit breaker with XGN2, GG1A other fixed cabinets APG process by pouring epoxy resin made using insulated cylinder, this structure can be effectively prevented, including external shocks, filthy environment and other external factors on the vacuum interrupter chamber of. Circuit breaker mechanism with spring operating mechanism to ensure the stability of the product quality from the design and process, in accordance with the principles of high quality components to ensure the high quality of the whole quality selection of sub-suppliers to ensure that the product life cycle in Reliability quality. Use of environmental conditions a) Ambient temperature maximum temperature: + 40oC minimum temperature: -15oC b) Humidity daily average relative humidity: ≤95% monthly average relative humidity: ≤90% daily average vapor pressure: ≤2.2 × 10-3 MPa month Average vapor pressure: ≤1.8 × 10-3 MPa c) Altitude: not exceed 1000m; d) seismic intensity does not exceed 8 degrees; e) use of premises without dripping, non-flammable and explosion hazard, non-corrosive gases, and no severe vibration. Main specifications and technical parameters Main specifications and technical parameters in Table 1. Table 1 No. Item Unit Value 1. Rated voltage kV 12 2. Rated frequency withstand voltage (1 min) 42 3. Rated lightning impulse withstand voltage (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-circuit breaking current kA 25 31.5 40 7. Rated short time withstand current 25 31.5 40 8. rated short duration s 4 9. Rated peak withstand current kA 63 80 100 10. Rated short-circuit current of 6,380,100 11. The secondary circuit power frequency withstand voltage (1 min) V 2000 12. Rated single / back to back capacitor bank breaking current A 630/400 (40 kA for 800/400) 13. Rated capacitor bank closing surge kA 12.5 (frequency not greater than 1000Hz) 14 points -0.3S- rated operating sequence combined points -180S- combined points