ZN99-12 (3AV5) series vacuum circuit breakers

General ZN99-12 (3AV5) series vacuum circuit breakers are three-phase AC 50Hz indoor device with 12kV rated voltage, used to protect and control the electrical equipment in industrial and mining enterprises, power plants and substations. It is suitable for the paces of different load and frequent operation. The circuit breaker adopts up-and-down structure , easy for maintenance. The compound insulation structure effectively reduces its volume and the longitudinal magnet arcing and optimization shielding of the circuit breaker improve its Insulation level and breaking performance. Main technical data No. NameUnitData1Rated voltage kV122Rated insulation level 1min power frequency withstand voltage kV42Lightning impulse withstand voltage 3Rated frequency Hz504Rated current A630, 1250, 25005Rated short time withstand current kA20, 25, 31.5, 406Rated peak withstand current kA50, 63, 80, 1007Rated short-circuit duration s48Rated short-circuit breaking current kA20, 25, 31.5, 409Rated short-circuit making current kA50,63,80,10010Rated operating sequence O-0.3s-CO-180s-CO11Breaking times at rated short-circuit breaking current time3012Opening time ms≤60 13Closing time ms≤10014Closing-opening time ms10015Mechanical life time10000