ZN12-40.5 Vacuum Circuit Breaker

General ZN12-40.5 indoor AC high voltage vacuum circuit breaker is a three-phase 50Hz indoor high voltage switchgear with 40.5kV rated voltage. The operating mechanism and the interrupter system of the circuit breaker are designed to be a whole structure, and its special spring stored-energy operating mechanism carry out AC/DC stored-energy operation by AC/DC motor, it also many be operated by hand. The circuit breaker has the features of simple structure, strong breaking capacity, long life, complete operating functions, no explosion hazard and easy maintenance, suitable for the control and protection of power distribution system of power plants, city power network and substations, especially for the places of breaking important load and frequent operation. Main technical data No.NameUnitData1Rated current A1250, 1600, 20002Rated voltage kV40.53Rated short-circuit breaking current kA2531.54Rated peak withstand current kA63805Rated short time withstand current kA2531.56Rated short-circuit duration s47Rated short-circuit making current (peak) kA63808Breaking times at rated short-circuit breaking current time209Rated operating sequence O-0.3s-CO-180s-CO10Rated lightning impulse withstand voltage (full wave) kV18511Rated short-time power frequency withstand voltage (1min) 9512Closing time ms≤9013Opening time ≤7514Mechanical life time1000015Breaking times at rated current 1000016Power of stored-energy motor W27517Rated voltage of stored-energy motor VAC110, 220; DC110, 22018Stored-energy time s≤1519Rated voltage of opening/closing electromagnet VAC110, 220; DC110, 22020Rated current of overcurrent release A521Rated current of auxiliary switch AAC 10; DC 5