ZW21Z-40.5 Outdoor High Voltage Vacuum Cirsuit Bre

General ZW21Z-40.5 outdoor high voltage vacuum circuit breaker is an outdoor switchgear suitable for 40.5kV AC 50Hz three phase power system. It is used to switch rated current and cut off fault current in power plants and substations to carry out the control and protection for power transmission and distribution line and electric equipment. It is especially suitable for the places of frequent operation. The circuit breaker is equipped with CTZ-I special spring operating mechanism or CD10 electromagnetic operating mechanism. Main technical data No.NameUnitData1Rated voltage kV40.52Rated insulation level 1min power frequency withstand voltage 95Lightning impulse withstand voltage (peak) 1853Rated current A1250, 1600, 20004Rated short-circuit breaking current kA2531.55Rated short-circuit making current (peak) 638064s short time withstand current 2531.57Rated peak withstand current 63808Rated operating sequence O-0.3s-CO-180s-CO9Mechanical life time1000010Total breaking times at rated short circuit current 2011Opening time /closing time s≤0.06/≤0.10